Inventors list

Assignees list

Classification tree browser

Top 100 Inventors

Top 100 Assignees


Distortion, noise, or other interference prevention, reduction, or compensation

Subclass of:

455 - Telecommunications

455039000 - TRANSMITTER AND RECEIVER AT SEPARATE STATIONS

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
455630400 Directional antenna 30
455630300 Frequency switching 19
455065000 Anti-multipath 7
455630200 System with hierarchical coverage areas 2
20100035556MANAGING INTERFERENCE FROM FEMTOCELLS - A system and method for minimizing interference for mobile devices in a communication network that includes a macrocell base station and a femtocell having a base station. The method receives initialization data on a backhaul connection between the femtocell base station and the macrocell base station, and uses that data to configure the femtocell base station transmitting power. The method receives a user equipment identifier from a macrocell user equipment in the communication network, and determines whether the macrocell user equipment is authorized. If authorized, the macrocell user equipment is granted access to the femtocell base station. If unauthorized, user equipment information for the macrocell user equipment received on the backhaul connection is used to adjust the femtocell base station transmitting power to minimize the interference for mobile devices.02-11-2010
20110124291METHOD FOR QUIETING AND SENSING IN A SECONDARY COMMUNICATIONS SYSTEM - A method of retaining channel use by a secondary system is described. A secondary channel used during periods of normal communication between a secondary transmitter and receiver is split into sub-bands for use during a quiet period containing quiet phases. During the quiet period, while the transmitter communicates with the receiver on one sub-band, the receiver simultaneously senses for incumbent devices on another sub-band, as well as vice-versa. Transmission and sensing do not occur simultaneously on the same sub-band and transmission is limited to only one of the sub-bands. Transmission and sensing are performed by both the transmitter and the receiver on every sub-band over the course of the quiet period. The locations of secondary receivers are determined and employed during scheduling such that devices sufficiently separated from each other transmit during different quiet phases and transmit and sense in sub-bands separated by another sub-band.05-26-2011
Entries
DocumentTitleDate
20100029213SUCCESSIVE DETECTION AND CANCELLATION FOR CELL PILOT DETECTION - Techniques for performing cell detection with successive detection and cancellation (SDC) are described. For SDC, pilots from stronger cells may be canceled from a received signal at a user equipment (UE) so that weaker cells may be detected as a result of reduced interference from the stronger cells. In one design, a UE processes a received signal to detect for a cell and determines whether the detected cell is sufficiently strong. If the cell is sufficiently strong, then the UE cancels the interference due to the detected cell from the received signal and further processes an interference-canceled signal to detect for another cell. The UE may detect for cells in a set of cells in a sequential order, from the strongest cell to the weakest cell. The UE may terminate detection when a cell not sufficiently strong is detected or when all cells in the set are detected.02-04-2010
20090209207MULTICARRIER MOBILE DEVICE - The invention relates to a multicarrier mobile device comprising a receiver (08-20-2009
20080261532Telecommunications Jack with crosstalk multi-zone crosstalk compensation and method for designing - The present disclosure relates to a telecommunications jack including a housing having a port for receiving a plug. The jack also includes a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing, and a plurality of wire termination contacts for terminating wires to the jack. The jack further includes a circuit board that electrically connects the contact springs to the wire termination contacts. The circuit board includes a multi-zone crosstalk compensation arrangement for reducing crosstalk at the jack.10-23-2008
20080261531SYSTEM AND METHOD FOR PROVIDING COVERAGE AND SERVICE CONTINUATION IN BORDER CELLS OF A LOCALIZED NETWORK - A system and method for providing continuous multimedia broadcast multicast services over different localized areas, while also avoiding frequency interference. In various embodiments, a service provides reduced-quality data at the border of each localized area. In one approach, border cells of a single frequency network (SFN) broadcast reduced quality data, while more centralized cells in a SFN broadcast full quality data. In other embodiments, source data is coded by two layers—a baseline layer and at least one enhancement layer. Centralized cells in a SFN transmit both baseline and enhancement layers. Border cells broadcast only the baseline layer. Centralized cells and border cells use the same sub-band to broadcast baseline layer data in a bit-identical way. Non-overlapping sub-bands are used by border cells of neighboring SFNs to transmit the baseline layer.10-23-2008
20090143015Systems and Methods for Self-Calibrating Transceivers - Techniques for self-calibration of transceivers are described herein.06-04-2009
20120184218Reduced Bandwidth Backhaul for Coordinated Multi-Point Reception - Embodiments herein provide reduced backhaul bandwidth requirements for Coordinated Multi-Point reception of an uplink signal. A cooperating base station receive and demodulates the uplink signal to produce soft output values that each indicate the value of a corresponding information symbol in the uplink signal and the level of certainty in that symbol value. The cooperating base station then selectively sends particular ones of the soft output values to a serving base station over a backhaul communication link based on whether or not the level of certainty indicated by each soft output value exceeds a certainty threshold. The serving base station likewise receives and demodulates the uplink signal to produce its own soft output values. The serving base station then combines respective ones of the soft output values it received from the cooperating base station and the soft output values it produced itself that are associated with the same information symbol.07-19-2012
20090191815Electrical circuits with reconfigurable interferer signal routing - An electrical circuit comprises a source of an interferer signal; at least one component configured for using the signal; at least two electrically parallel conductive paths by which the signal can pass between the source and each of the at least one components; and a signal path selector configured to selectively enable the signal to pass from the source to the component by any of the at least two conductive paths and to, when one of the paths is enabled to carry the signal, disable each of the other at least two paths from carrying the signal.07-30-2009
20090191814SPARSE SAMPLING OF SIGNAL INNOVATIONS - Signals, including signals from outside of the subspace of bandlimited signals associated with the Shannon theorem, are acquired while still providing an acceptable reconstruction. In some aspects a denoising process is used in conjunction with sparse sampling techniques. For example, a denoising process utilizing a Cadzow algorithm may be used to reduce the amount of noise associated with sampled information. In some aspects the denoising process may be iterative such that the denoising process is repeated until the samples are denoised to a sufficient degree. In some aspects, the denoising process converts a set of received samples into another set corresponding to a signal with a Finite Rate of Innovation (FRI), or to an approximation of such a signal. The disclosure relates in some aspects to combination of a denoising process with annihilating filter methods to retrieve information from a noisy, sparse sampled signal. The disclosure relates in some aspects to determining a sampling kernel to be used to sample the signal based on noise associated with the signal. The disclosure relates in some aspects to determining the number of samples to obtain from a signal over a period of time based on noise associated with the signal. The disclosure relates in some aspects to determining the finite number of innovations of a received signal.07-30-2009
20100081388METHOD AND APPARATUS TO FACILITATE PREVENTING INTERFERENCE AS BETWEEN BASE STATIONS SHARING CARRIER RESOURCES - A first base station communicates (04-01-2010
20100069011Methods and Apparatus For Self-Jamming Suppression In A Radio Frequency Identification (RFID) Reader - A circuit for transmitter-receiver isolation that is useful in a monostatic (combined transmitting and receiving) antenna configuration is shown and described. In addition, methods and systems are shown for automatically adjusting the circuit in response to changes in antenna configuration, external signal reflectors, and jamming energy (e.g., self jammer energy) by adjusting the circuit to tune out these sources of jammer energy to yield an increase in RFID reader receiver sensitivity when compared to measurements of the receiver sensitivity when the jammer energy is not present.03-18-2010
20100159839METHOD AND APPARATUS FOR REDUCING LINK INTERFERENCE BY A LINK BETWEEN A USER EQUIPMENT COMPONENT AND AN ACCESS NETWORK COMPONENT - A method and apparatus are described for reducing link interference by a link between a user equipment component and an access network component. The user equipment component and access network component are connected by links over dedicated channels in respective directions, the link channel power in the first direction being controlled by the link channel in the second direction. A component sends in a second direction a link connection release message for a link connection in the first direction, identifies when the link connection in the first direction is released and, when the release is identified, releases the link connection in the second direction.06-24-2010
20090170438Method and system for reducing signal interference - Signals propagating on an aggressor communication channel can cause interference in a victim communication channel. A sensor coupled to the aggressor channel can obtain a sample of the aggressor signal. The sensor can be integrated with or embedded in a system, such as a flex circuit or a circuit board, that comprises the aggressor channel. The sensor can comprise a dedicated conductor or circuit trace that is near an aggressor conductor, a victim conductor, or an EM field associated with the interference. An interference compensation circuit can receive the sample from the sensor. The interference compensation circuit can have at least two operational modes of operation. In the first mode, the circuit can actively generate or output a compensation signal that cancels, corrects, or suppresses the interference. The second mode can be a standby, idle, power-saving, passive, or sleep mode.07-02-2009
20120244815RF DATA TRANSFER IN A SPHERICAL CAVITY - A system comprises an outer shell having an inner spherical cavity and an inner sphere located in the spherical cavity. The inner sphere comprises a sensor; at least one transmit antenna; and at least one transmitter coupled to the sensor and to a respective one of the at least one transmit antenna. The system also comprises a first receive antenna located in the spherical cavity; a second receive antenna located in the spherical cavity; and a receiver located outside of the outer shell. The receiver is configured to determine the signal to noise ratio of a first signal received at the first receive antenna and the signal to noise ratio of a second signal received at the second receive antenna; and to combine the first and second signals based on the respective signal to noise ratios such that interference due to multi-path signals in the spherical cavity is reduced.09-27-2012
20090311963Methods of Remotely Identifying, Suppressing, Disabling and Access Filtering Wireless Devices of Interest Using Signal Timing and Intercept Receivers to Effect Power Reduction, Minimization of Detection, and Minimization of Collateral Interfernce. - Techniques for interfering with communications made according to a wireless standard between a beacon and a wireless device. The techniques determine a characteristic that is required by the standard for a signal produced during the communication. Then an interference signal is generated that is specifically adapted to the characteristic and interferes with the characteristic such that the wireless device and the beacon cannot interact as provided for the communication by the wireless standard. The techniques may be used to suppress legitimate wireless beacons in an operational area, to establish a baiting beacon in the operational area, or to interfere with communications between a wireless device and a baiting beacon or other beacon. The interference signal is specifically adapted to the characteristic in a way that greatly reduces the amount of power required for the interference signal and the conspicuousness of the interference signal.12-17-2009
20100144279APPARATUS, METHOD AND RADIO SYSTEM - An apparatus is provided to include a detector. The detector can detect that an interfering communications connection to a received satellite system signal in a mobile terminal is to be established by the mobile terminal. The apparatus include a processor that can prevent interference to the received satellite system signal due to the interfering communications connection by controlling uplink resource allocation of the mobile terminal based on the detection.06-10-2010
20130035040SYSTEMS AND METHODS FOR NOISE CANCELLATION AND POWER MANAGEMENT IN A WIRELESS HEADSET - This includes systems and methods for noise cancellation and power management in a wireless headset. The wireless headset can perform noise cancellation by using two or more omni-directional microphones to generate a noise canceling “cone.” Audio signals received outside of the cone can be filtered out. An accelerometer can be used to determine the location of the wireless headset and the system can then properly position the cone to face the user's voice and filter out other audio signals. Additionally, by monitoring the ambient noise, the system can save power by turning off the noise cancellation system when the amount of ambient noise is below a threshold value.02-07-2013
20120164948INTERFERENCE MITIGATION IN A DEVICE HAVING MULTIPLE RADIOS - A wireless terminal that supports operation on a first wireless technology and operation on a second wireless technology performs a first set of measurements on a received signal on first operating frequency of the first wireless technology, wherein the first set of measurements are performed during time periods that overlap time periods during which the wireless terminal transmits signals of the second wireless technology. The terminal also performs interference avoidance to avoid interference from transmissions of signals of the second wireless technology to reception of signals of the first wireless technology if the first set of measurements indicates interference due to transmission of signals of the second wireless technology by the wireless terminal.06-28-2012
20090124206PILOT SIGNAL POWER CONTROL APPARATUS AND OPERATION METHOD OF PILOT SIGNAL POWER CONTROL APPARATUS - A pilot signal power control apparatus to determine a power level of a pilot signal of a primary network to indicate an availability of a wireless resource of thereof to a secondary user of a secondary network according to a cognitive radio technology, the pilot signal power control apparatus and an operation method thereof, the pilot signal power control apparatus including: a prediction unit to predict a noise increase and/or a sensing probability, the noise increase occurring in a primary user of the primary network due to a channel estimation error, and the sensing probability being a probability that a secondary user senses the pilot signal of; a channel capacity calculation unit to calculate a channel capacity of the primary user based on the predicted noise increase and/or sensing probability; and a power level determination unit to determine the power level of the pilot signal using the calculated channel capacity.05-14-2009
20130090067Communication System with Configurable Capacitors - Methods and systems for a configurable tuned MOS capacitor are disclosed and may include filtering undesired signals in a chip utilizing one or more configurable MOS capacitors comprising one or more MOS transistors. The source and drain terminals of the MOS transistors may be coupled together. The filtering frequencies may be tuned by configuring a resonance frequency of a matching circuit coupled to the source and drain terminals. The matching circuit may include a variable capacitor, which may include an array of binary-weighted addressable capacitors. The addressable capacitors may include MOS transistors. The matching circuit may include a variable inductor such as a multi-tap transmission line, and may be integrated on the chip and/or on a package to which the chip is bonded. A capacitance value of the configurable MOS capacitor may be configured utilizing a bias voltage on the matching circuit.04-11-2013
20100136916ORTHOGONAL CROSS POLARIZATION INTERFERENCE COMPENSATING DEVICE, DEMODULATOR, RECEIVING STATION, AND METHOD OF COMPENSATING CROSS-POLARIZATION INTERFERENCE - An orthogonal cross-polarization interference compensating device for solving the problem tin which integration contents of an integration circuit are indefinite when a control loop is cut. An orthogonal cross-polarization interference compensator generates a compensation signal for compensating phase noise included in an own polarization signal. A demodulator compensates for orthogonal cross-polarization interference based on the compensation signal for the phase noise included in the own polarization signal. An error detector generates an error signal indicating phase difference between the own polarization signal compensated by the demodulator and a proper own polarization signal. A phase noise phase detector generates a differential signal indicating phase difference between the own polarization signal and other polarization signals based on the compensation signal and the error signal. An integration circuit integrates the differential signal and generates an integration signal. An infinite phase-shifter adjusts the compensation signal based on the integration signal. A control circuit determines whether or not orthogonal cross-polarization interference is present based on the compensation signal adjusted by the infinite phase-shifter, and adjusts the integration value indicated by the integration signal to be a predetermined value when there is no orthogonal cross-polarization interference.06-03-2010
20090305636METHOD AND ARRANGEMENT FOR INTERFERENCE MITIGATION - In a method of interference mitigation in a multi user detection capable radio base station in a communication system, which radio base station comprises a set confined detection modules, at least one of which is capable of handling multiple user connections, first and at least a second subset of detection modules are formed from said set, wherein the second set comprises at least one interference mitigation capable detection module. Interference information from the first subset is communicated to the second subset, interference originating in user connections of the first subset are then mitigated from the user connections of the second subset. Subsequently, interference is mutually mitigated between the connections within the interference mitigation capable detection module.12-10-2009
20130072123CHANNEL QUALITY REPORTING USING A DYNAMICALLY ADJUSTED MEASUREMENT POWER OFFSET - Methods and apparatuses are provided for facilitating dynamic measurement power offset adjustments for use in reporting channel quality feedback. A user equipment may generate and send a plurality of channel quality indicator (CQI) values to a base station. The base station determines whether at least some of the received CQI values are outside of an upper or lower threshold value. If at least some of the received CQI values are outside the upper or lower threshold value, the base station can transmit an adjusted measurement power offset to the user equipment. On receipt of the adjusted measurement power offset, the user equipment generates subsequent CQI values using the adjusted measurement power offset.03-21-2013
20090270038Method and Apparatus for Adding a Communication Connection to a Vectored Group - Methods for adding a communication connection to a vectored group of communication connections and corresponding apparatuses are disclosed.10-29-2009
20090270040Dynamic EMI (electromagnetic interference) management - In one embodiment, a method is provided. The method may include determining if electromagnetic interference (EMI) is emitted by a device in one or more regions of an electromagnetic spectrum occupied by other users, and if it is determined that EMI is emitted by the device in one or more regions of the electromagnetic spectrum occupied by other users, reducing the EMI in the one or more regions, and increasing the EMI in one or more other regions unoccupied by the other users.10-29-2009
20090270039Method and hybrid circuit for attenuating near-end crosstalk in a bidirectional signal transmission - The present invention relates to a method for attenuating near-end crosstalk between a remote received signal and a locally transmitted signal in a bidirectional signal transmission wherein said method comprises the step of producing an analog automatic feedback-driven correction loop in order to provide a no-correlation between said transmitted and received signals and to a hybrid circuit for enabling said method.10-29-2009
20130065532Clock Signal Leakage Cancellation in Wireless Systems - Methods and systems for utilizing undersampling for crystal leakage cancellation are disclosed and may include undersampling a composite signal comprising a desired signal and leakage signals due to one or more clock signals. Measured DC signals generated by each of the undersampled signals may be reduced by adjusting the phase and/or amplitude of the clock signals. The undersampling may be performed at one or more of the one or more clock signals, or at integer sub-harmonics of the clock signals. The composite signal may include a signal received by a wireless system or a signal to be transmitted by the wireless system. The undersampled signals may be low-pass filtered. The desired signal may include in-phase and quadrature signals or a polar signal. The undersampling may be performed by one or more sample and hold circuits and the clock signals may be generated utilizing one or more crystal oscillators.03-14-2013
20110021153CENTRALIZED CROSS-LAYER ENHANCED METHOD AND APPARATUS FOR INTERFERENCE MITIGATION IN A WIRELESS NETWORK - Apparatus and methods for improving the throughput and capacity of a wireless communications network. In one embodiment, this improvement is accomplished by focusing upon reduction of the co-channel interference, including the interferences that are unpredictable or undetectable to a traditional network. Various implementations detect the receiver interference (i.e. the interference affecting the receiver performance) at the transmitting node in order to avoid or reduce its effect at the receiving node. This detection can be as simple as e.g., spectral sensing constituting power measurement, and/or can be more sophisticated such as measurements including bandwidth, duty cycle and statistical behavior of the unwanted signal.01-27-2011
20090233555RADIO COMMUNICATION APPARATUS AND INTERFERENCE REMOVING METHOD - A radio communication apparatus having a first antenna and a second antenna, includes an interference estimation unit configured to estimate, using a signal of a second frequency band received by the second antenna, an interference component in the second frequency band contained in a signal of a first frequency band, and an interference removing unit configured to remove, based on information on the interference component estimated by the interference estimation unit, the interference component in the second frequency band contained in the signal of the first frequency band received by the first antenna.09-17-2009
20090233554Mitigation of internetwork interference - When a device in one wireless network receives interfering transmissions from an overlapping neighboring network, the neighboring network may be notified of the interference so that non-interfering schedules can be worked out. In one embodiment, the device receiving the interference may broadcast its own communications schedule. Device(s) in the interfering network may pick up that schedule, and pass it on to their controller, which can rearrange its own network schedule to be non-interfering. In another embodiment, the device receiving the interference may notify its own network controller with the pertinent information, and that controller may contact the controller of the interfering network to coordinate non-interfering schedules.09-17-2009
20090233553AUTOMATIC OPTIMIZATION OF RF RECEIVER INTERFERENCE PERFORMANCE - A method and apparatus for optimization of RF receiver interference performance in a mobile phone operating in a TDMA communications system is disclosed. The battery supply voltage ripple of the battery of the mobile phone is measured and it is determining when the battery supply voltage ripple is greater than a predetermined level. The RF receiver is adjusted to improve the mode of operation of the RF receiver when the battery supply voltage ripple is greater than the predetermined level.09-17-2009
20130165049APPARATUS AND METHOD FOR CONTROLLING IN-DEVICE COEXISTENCE INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - There are provided a method and apparatus in which a User Equipment (UE) controls In-Device Coexistence (IDC) interference in a wireless communication system. Exemplary embodiments of the present invention provides a method including transmitting, to a base station (BS), UE capability information of whether the UE has a capability to control IDC, receiving, from the BS, IDC indication configuration information of whether the IDC is on-going, and transmitting, to the BS, a measurement result in consideration of IDC or a measurement result without consideration of IDC and IDC indication based on the IDC indication configuration information. According to exemplary embodiments of the present invention, UE can send information related to IDC interference to an evolved NodeB (eNB).06-27-2013
20090017760METHODS AND APPARATUS FOR SUCCESSIVE INTERFERENCE CANCELLATION BASED ON RATE CAPPING IN PEER-TO-PEER NETWORKS - In an ad hoc peer-to-peer communication network between wireless devices, a high priory first receiver device is configured to perform successive interference cancellation (SIC). The first receiver device receives a first transmission request from a first transmitter device indicating that the first transmitter device intends to transmit traffic to the first receiver device. Similarly, the first receiver device receives a second transmission request from an interferer second transmitter device. The first receiver device then determines a transmission rate cap for the interferer second transmitter device based on the signal strengths of the first and second transmission requests and sends it to the interferer second transmitter device. The transmission rate cap is a maximum rate at which the first receiver device can reliably decode traffic signals from the second transmitter device.01-15-2009
20120231741Apparatus and Method for Providing Uplink Interference Coordination in a Radio Communication System - An apparatus and a method provide for uplink interference coordination in a radio communication system, such as a cellular communication system. Measurements are made at mobile stations associated with uplink-channel interference conditions. Reports are made to the network when a mobile station experiences interference conditions beyond a measurement threshold. If greater than a group-threshold number of mobile stations experience high levels of uplink-channel interference, communication resources are reallocated in compensation for the high interference conditions.09-13-2012
20100087149MEASURING COMMUNICATING AND USING INTERFERENCE INFORMATION - Apparatus and methods of performing interference mitigation in a communication network. The interference mitigation can include a controller sending a message to a first access point instructing the first access point to measure at least one signal transmitted by a first wireless terminal communicating a signal having known characteristics; the controller receiving from the first access point signal measurement information; and the controller communicating at least some of the signal measurement information received from the first access point to a second access point.04-08-2010
20120238217WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND SENSITIVITY ADJUSTMENT METHOD - Provided is a wireless communication apparatus including a filter for removing a signal whose strength is below a threshold, a signal distinguishing unit for distinguishing between a non-interfering signal that is transmitted/received in a network that the wireless communication apparatus is connected to and an interfering signal that is transmitted/received in a network that the wireless communication apparatus is not connected to, and a threshold adjustment unit for raising, in a case an interfering signal passed through the filter, the threshold to a level that causes the interfering signal to be removed by the filter.09-20-2012
20100184380MITIGATING INTERCARRIER AND INTERSYMBOL INTERFERENCE IN ASYNCHRONOUS WIRELESS COMMUNICATIONS - Systems and methodologies are described that facilitate mitigating intercarrier and intersymbol interference in symbol transmissions over wireless communications where transmitter and receiver may not be time synchronized. Symbol periods can be extended for transmitting symbols such that an original symbol can be transmitted with one or more duplicated symbols keeping phase continuous, blank symbols, and/or the like. In this regard, multiple receiver windows can be required to receive the symbol such that at least one window has a non-interfered symbol even though timing can be misaligned (e.g., in asynchronous communications channels). Alternatively, the receiver windows can be divided to allow similar receipt of symbols over multiple windows such that one window has a non-interfered symbol. Also, timing misalignment that leads to phase ramping in frequency is accounted for to allow proper demodulation of the symbol.07-22-2010
20120289164FREQUENCY DIVISION MULTIPLE ACCESS COMMUNICATIONS WITHIN A DEVICE - A radio transceiver device includes circuitry for radiating electromagnetic signals at a very high radio frequency both through space, as well as through wave guides that are formed within a substrate material. In one embodiment, the substrate comprises a dielectric substrate formed within a board, for example, a printed circuit board. In another embodiment of the invention, the wave guide is formed within a die of an integrated circuit radio transceiver. A plurality of transceivers with different functionality is defined. Substrate transceivers are operable to transmit through the wave guides, while local transceivers are operable to produce very short range wireless transmissions through space. A third and final transceiver is a typical wireless transceiver for communication with remote (non-local to the device) transceivers.11-15-2012
20100184381ADAPTIVE BEAM FORMING WITH MULTI-USER DETECTION AND INTERFERENCE REDUCTION IN SATELLITE COMMUNICATION SYSTEMS AND METHODS - Satellite communications methods include receiving communications signals including co-channel interference at a space-based component from a plurality of wireless terminals in a satellite footprint over a satellite frequency band and reducing interference in the communication signals by (a) performing co-channel interference reduction on the communications signals to generate a plurality of interference reduced signals and (b) performing multiple access interference cancellation on the interference reduced signals. An interference reducing detector for a satellite communications system includes an interference reducer configured to perform co-channel interference reduction on communications signals to generate a plurality of interference reduced signals, and a detector configured to perform multiple access interference cancellation on the interference reduced signals. Satellite communications systems and satellite gateways including interference reducing detectors are also disclosed.07-22-2010
20110130099SYSTEMS, APPARATUS AND METHODS FOR DISTRIBUTED SCHEDULING TO FACILITATE INTERFERENCE MANAGEMENT - Systems, methods, apparatus and computer program products for scheduling in a wireless communication system are provided. In some embodiments, the method can include: receiving a buffer status report from user equipment having one or more logical channel groups; configuring a first priority metric and a first prioritized bit rate for at least one of the one or more logical channel groups, wherein the configuring a first priority metric and a first prioritized bit rate for at least one of the one or more logical channel groups is in response to information included in the buffer status report; determining interference at the user equipment; and re-configuring, by the serving base station, the first priority metric and the first prioritized bit rate for the at least one of the one or more logical channel groups in response to determining interference at the user equipment.06-02-2011
20100267340METHOD AND APPARATUS TO TRANSMIT SIGNALS IN A COMMUNICATION SYSTEM - A method is provided to transmit a signal by a transmitter in a communication system. The method includes predicting a receiver noise signal received from a receiver, and increasing an intelligibility of a transmitter signal using the receiver noise signal. The transmitter signal includes a transmitter noise signal and a transmitter speech signal. The transmitter cancels the transmitter noise signal from the transmitter signal and intensifies the transmitter speech signal in consideration of the receiver noise signal.10-21-2010
20110300806USER-SPECIFIC NOISE SUPPRESSION FOR VOICE QUALITY IMPROVEMENTS - Systems, methods, and devices for user-specific noise suppression are provided. For example, when a voice-related feature of an electronic device is in use, the electronic device may receive an audio signal that includes a user voice. Since noise, such as ambient sounds, also may be received by the electronic device at this time, the electronic device may suppress such noise in the audio signal. In particular, the electronic device may suppress the noise in the audio signal while substantially preserving the user voice via user-specific noise suppression parameters. These user-specific noise suppression parameters may be based at least in part on a user noise suppression preference or a user voice profile, or a combination thereof.12-08-2011
20110300807APPARATUS AND METHOD FOR CONTROLLING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM OF HIERARCHICAL CELL STRUCTURE - An apparatus and a method of a macro terminal for controlling interference in a wireless communication system of a hierarchical cell structure are provided. The method includes setting measurement reporting configuration for a blanking trigger per measurement identifier allocated by a macro base station, measuring a receive signal strength of a neighbor base station, comparing the measured receive signal strength value with a reference receive signal strength value of the measurement reporting configuration for the blanking trigger, and according to a comparison result, transmitting to the macro base station, a measurement report message comprising a measurement identifier corresponding to the measurement reporting configuration for the blanking trigger of a pico base station.12-08-2011
20110300805ADAPTIVE CELLULAR POWER CONTROL - A method of mitigating interference in a mobile wireless communication device by adaptively adjusting transmit power levels of a wireless cellular transceiver. A receive signal quality for a wireless non-cellular transceiver that includes interference from signals transmitted by the wireless cellular transceiver is estimated. The wireless non-cellular and wireless cellular transceivers are co-located in the mobile wireless communication device, and both transceivers are active. An actual transmit power of the wireless cellular transceiver is adjusted based on the estimated receive signal quality to a level less than a requested transmit power. The estimation of the receive signal quality and the adjusting of the actual transmit power is periodically repeated. The estimation accounts for operational properties of the wireless cellular and non-cellular transceivers as well as operational characteristics of wireless connections through the transceivers.12-08-2011
20110281524System For Reducing Signal Interference - A system for suppressing interference imposed on a victim communication signal by an aggressor communication signal including a circuit that comprises an input port, an output port, and a signal processing circuit connected between the input port and the output port, the signal processing circuit being operative to produce an interference compensation signal at the output port, for application to the victim communication signal, via processing a sample of the aggressor communication signal transmitted through the input port, and the input port being configured to connect to a sampling system that includes a first circuit trace running along a surface of a flex circuit of a portable wireless device that is dedicated to sensing the aggressor communication signal flowing on a second circuit trace running along the surface of the flex circuit.11-17-2011
20110143673AUTOMATIC POSITIONING OF DIVERSITY ANTENNA ARRAY - Embodiments of the invention provide an antenna system for connecting to a wireless device through a communication link. The antenna system comprising an antenna array configured to pre-scan frequency bands of radio signals in a plurality of antenna array directions, a transceiver connected to the antenna array. The transceiver is configured to analyze the signals received from the antenna array to obtain one or more parameters from one or more MIMO channels of the antenna array, and transmit the one or more parameters to the antenna controller. Further, the antenna system comprises a platform connected to the antenna array, wherein the platform is configured to position the antenna array, and a motor controller connected to the platform. The motor controller is configured to receive one or more position signals from the device, wherein the position signals correspond to a pre-scanned performance level of the communication link based on the parameters, and control the position of the antenna array by rotating the platform based on the position signals.06-16-2011
20120108175MULTIPLE SIGNAL TRANSFORMATION IN WIRELESS RECEIVERS - A frontend receiver of a user equipment (UE) is configured with multiple transform operations assigned to separate sets of cells. One set of cells includes the serving cell of the UE and at least one additional cell within a first offset range of the serving cell. Another set or sets of cells include additional interferer cells within another offset range of the serving cell. After tracking the common frequency/timing offsets of each set of cells the assigned transform operation for that set transforms the time domain samples into frequency domain symbols. The individual frequency/timing offsets for each cell within the set are then tracked.05-03-2012
20100120368NOISE CANCELLATION FOR RFID BACKSCATTER - Methods and apparatuses for removing unwanted noise by a radio frequency identification (RFID) interrogator are provided. The interrogator transmits a transmitted signal while receiving a received signal. The received signal can include backscatter modulated signals from one or more RFID tags, as well as unmodulated reflections of the transmitted signal from the environment. The unmodulated reflections are undesirable and may make tag signal extraction difficult. A canceling signal is summed with the received signal to cancel or reduce the unmodulated reflections prior to tag signal extraction. In a specific embodiment, a phase shifted, amplitude adjusted reflection of the transmit signal is used by a directional coupler as the canceling signal.05-13-2010
20090104876RECEIVER, TRANSMITTER, TRANSMISSION SYSTEM, AND TRANSMISSION METHOD - To reduce the affections of noises having greater instantaneous powers than received signals. A receiver of block transmission scheme, in which signal blocks from a transmitting end are received and equalization is performed for each of the received signal blocks, comprises a local noise detecting unit detecting a local noise locally existing in a received signal block and having a greater amplitude than the signals; a local noise eliminating unit generating a local-noise-eliminated received signal block in which the signals in the range where the local noise is existent within the received signal block have been eliminated together with the local noise; and an equalizer that performs an equalization based on the local-noise-eliminated received signal block.04-23-2009
20090286481DYNAMIC INTERFERENCE MANAGEMENT FOR WIRELESS NETWORKS - Methods and apparatuses for dynamic interference management for wireless networks are disclosed. A node in a wireless network is configured to determine whether to cease transmissions during a period of time designated for a first node to transmit to a second node based on at least parameter relating to a channel between the first and second nodes.11-19-2009
20120171965Anti-Interference and Anti-Piracy Methods For Improving Stability of RF Signals for Two-Way Remote Control System - A remote control system and its anti-interference and anti-piracy methods for improved stability of RF signals; it comprises: a HHCU and a main unit for two-way wireless transmission; its functions include: optimized channel can be searched automatically in signal transmission while confirming the feedback after implementation; multiple interactive encryption, multiple RF transmission receiving and group tag technologies are adopted to realize multiple efficacies such as: quick response, resistance to interference and piracy and improvement of RF signal stability. Furthermore, the system employees methods for multiple function module and automatic adjustment of power output for RF signal that minimize power consumption and provides more versatile use of the system.07-05-2012
20100035555METHOD AND APPARATUS FOR IMPLEMENTING MULTI-CELL COOPERATION TECHNIQUES - A method and apparatus are provided for multi-cell cooperation when multiple cells are cooperating to transmit data to a plurality of wireless transmit/receive units (WTRUs), and each cell is using a common precoding matrix. The level of information exchanged among the cells may depend on the particular cooperation architecture. The cells may share information such as channel state information (CSI), a channel quality indicator (CQI), or both. The cells may share rank indications reported by the WTRUs. The cells may also share the data that is being transmitted to the WTRUs. The method and apparatus may also determine precoding vectors for closed-loop precoding; a CQI, CSI and rank, and distributed space-time/frequency coding with multi-cell cooperation. The method and apparatus may also perform hybrid automatic repeat request (HARQ) with multi-cell cooperation, and downlink control signaling.02-11-2010
20100035554Adaptive Complex Gain Predistorter for a Transmitter - Symbols are transmitted in a Cartesian transmitter by pre-distorting an input signal X having in-phase and quadrature components using a first compensation lookup table operable to hold complex valued entries to carry out in-phase and quadrature compensation pre-distortion with respect to the input signal to form a pre-distorted signal Z. The pre-distorted signal Z is processed to form an output signal Y using a nonlinear element. A complex gain normalization parameter adaptively updated to reflect varying gain of a linear region of the nonlinear element. A normalized feed back signal {tilde over (Y)} is formed using the adaptively updated complex gain normalization parameter. The first compensation lookup table is updated based on the pre-distorted input signal Z and the adaptively normalized feedback signal {tilde over (Y)}.02-11-2010
20090098828COMMUNICATIONS SYSTEM USING ADAPTIVE FILTER THAT IS SELECTED BASED ON OUTPUT POWER - A communications system receives a modulated signal that carries encoded communications data. An adaptive filter has an input, a plurality of non-adaptive and adaptive filter taps with weighted coefficients, and an output. The received signal is passed through the adaptive filter and around adaptive filter and a switch selects which signal to pass to demodulator based on measured output power of the adaptive filter and of the original received signal. A demodulator and decoder receive the filtered output signal and demodulate and decode the signal to obtain the communications data.04-16-2009
20090149130APPARATUS AND METHOD FOR REMOVING AN ECHO SIGNAL IN A SIGANL TRANSMISSION/RECEPTION APPARATUS OF A COMMUNICATION SYSTEM - A method and apparatus for removing an echo signal in a signal transmission/reception apparatus of a communication system is provided. A signal transmission/reception apparatus estimates an input channel response using a training sequence, generates a first signal by removing the input channel response from a first reception signal, detects an echo channel impulse response using the first signal, detects an echo signal removing coefficient using the echo channel impulse response, generates a second signal in which an echo signal is removed by applying the echo signal removing coefficient to a second reception signal, and removes the second signal from a third signal, wherein the first signal is received prior to receiving the second signal and the second signal is received prior to receiving the third signal.06-11-2009
20100304682CLUSTERING METHOD AND COMMUNICATION DEVICE FOR COORDINATED MULTIPOINT TRANSMISSION - A communication system performing a coordinated multipoint transmission is provided. A mobile station may measure expected channel quality information when an interference of a serving base station does not exist. The serving base station may determine whether a neighbor base station and the serving base station are eligible to perform the coordinated multipoint transmission. The serving base station may determine whether the neighbor base station and the serving base station are eligible to perform the coordinated multipoint transmission using a criterion associated with an evaluation of an increase in a transmission rate of the mobile station.12-02-2010
20100304680METHOD AND APPARATUS FOR UTILIZING A TRANSMISSION POLARIZATION TO REDUCE INTERFERENCE WITH A PRIMARY INCUMBENT SIGNAL - A mobile station (12-02-2010
20100267342System and Method for Supporting a Keep Alive Mechanism in a Wireless Communications System - A system and method for supporting a keep alive mechanism in a wireless communications system are provided. A method for communications device operation includes if the communications device is operating within an idle time window and if the communications device is in the idle state, initiating a keep alive procedure, and if the communications device is not operating within the idle time window and if an elapsed time since a last transmission by the communications device is greater than an upper boundary of the idle time window, initiating the keep alive procedure. The method further includes if the communications device is not operating within the idle time window and if the elapsed time since the last transmission by the communications device is less than a lower boundary of the idle time window, not initiating the keep alive procedure.10-21-2010
20100267341Multi-Point Opportunistic Beamforming with Selective Beam Attenuation - A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.10-21-2010
20100267339Method for Preventing Collision and Wireless Transceiver Using the Same - A wireless transceiver device capable of preventing collision includes a first wireless module and a second wireless module. The first wireless module includes a first wireless transceiver unit for transmitting and receiving wireless signals of a first wireless communication system, and an indication signal generating unit for generating an indication signal indicating that the first wireless transceiver unit starts to transmit or receive a wireless signal at a first time point before the first wireless transceiver unit transmits or receives the wireless signal. The second wireless module includes a second wireless transceiver unit for transmitting and receiving wireless signals of a second wireless communication system, and a transmission control unit for controlling the second wireless transceiver unit to stop transmitting or receiving wireless signals from the first time point according to the indication signal.10-21-2010
20100267338Method For Restraining Inter-Cell Interference In A Mobile Communication System - A method for restraining inter-cell interference in a mobile communication system is provided. The method uses the fast dynamic selection of the Fractional Frequency Reuse (FFR) technology and the Macro Diversity (MD) technology of the cell edge to increase the cell edge user data rate and provide excellent system capacity. The method is particularly suitable in a OFDMA mobile communication system downlink. The method comprises the steps of: (a) determining whether the cell edge user is able to operate the MD technology; (b) processing the fast dynamic selection of the FFR technology and the MD technology for the cell edge user, and the selection is made based on a instantaneous link Signal Quality Index (SQI); and (c) allocating the center subband or the edge subband to the cell edge user according to the selection.10-21-2010
20100056063SIGNAL CORRECTION DEVICE - A signal correction device including: an orthogonal transform section configured to perform an orthogonal transform for an input signal that includes a speech as a target signal and an unnecessary non-target signal; an interval determining section configured to determine whether each frame of the input signal is an interval in which the non-target signal is dominantly included; a suppressing gain calculating section configured to calculate suppressing gain for suppressing the non-target signal for each first frequency band width for a frame determined to be the interval, and to calculate suppressing gain for suppressing the non-target signal for each second frequency bandwidth for a frame determined not to be the interval; and a signal correcting section configured to perform a signal correcting process for suppressing the non-target signal for a transform coefficient acquired by the orthogonal transform section by using the suppressing gain.03-04-2010
20080261530Method and Arrangement for Activity Detection in a Telecommunication System - The present invention relates to a method and arrangement for efficient use of network resources, in particular for continuous connectivity services. The present invention introduces a set of established rules for uplink and/or downlink activity detection such that a Node B and/or a UE is enabled to detect active and inactive transmission periods on links for reception of packet data transmission and can independently arrange for inactivity/activity state transitions without any need of further signalling. Such a set of rules can be communicated to the Node B and the user equipment, e.g., from the radio network controller (RNC), or can consist of a predefined set of fixed rules that is readily implemented in said units.10-23-2008
20120034874APPARATUSES AND/OR METHODS OF INTERFERENCE MITIGATION AND/OR RATE IMPROVEMENT VIA UNCOORDINATED BEAMFORMING IN HETEROGENEOUS NETWORKS - A method of selecting beamforming vectors for a first transmitter and a first receiver communicating via a first communication link to reduce interference at a second transmitter and a second receiver communicating via a second communication link includes estimating a transmission null space for the second transmitter with respect to the first receiver and estimating a reception null space for the second receiver with respect to the first transmitter. The method further includes determining a first transmission beamforming vector for the first transmitter that falls within the estimated reception null space, and determining a first reception beamforming vector for the first receiver that falls within the estimated transmission null space.02-09-2012
20100120367SYSTEMS AND METHODS OF REDUCING INTERFERENCE - A system and method of reducing interference on a communication channel between an access terminal and a serving cell or node are disclosed. A cooperation request may be sent to an interfering cell or node to reduce and/or mitigate interference on the communication channel caused by the interfering cell or node. The interfering cell or node may perform beamforming, may intermittently transmit its wireless signal, or may move at least one antenna to mitigate and/or reduce interference on the communication channel.05-13-2010
20100285752BEAMFORMING METHODS AND SYSTEMS EMPLOYING MEASURED POWER AT A RECEIVER TO PERFORM CHANNEL ESTIMATION - Beamforming methods and systems are described in which differential channel estimation can be computed based on measured power at receiver. Simultaneous activation of antennas in separate pairs can be used to determine relative phases of antennas with respect to a reference antenna based on the power measurements. In turn, the beam forming signals can be weighted in accordance with the relative phases to adapt the signals to a multipath environment. Existing power measurement capabilities of conventional receivers can be employed to achieve approximate channel estimates.11-11-2010
20090088080SCHEDULING BASED ON EFFECTIVE TARGET LOAD WITH INTERFERENCE CANCELLATION IN A WIRELESS COMMUNICATION SYSTEM - Techniques for scheduling users for transmission on the uplink in a wireless communication system are described. A cell may perform interference cancellation for uplink transmissions and may observe lower effective noise and interference due to interference cancellation. The lower effective noise and interference may allow the cell to operate with a higher effective target load, which may support a higher overall throughput for the cell. In one design, an effective target load for a cell using interference cancellation may be determined, e.g., based on a target rise-over-thermal (RoT) for the cell and an interference cancellation efficiency factor. An available load for the cell may be determined based on the effective target load, which may be higher than a target load for the cell without interference cancellation. Users in the cell may then be scheduled for transmission on the uplink based on the available load.04-02-2009
20100087148IDENTIFYING AND CONTROLLING INTERFERENCE FROM WIRELESS TERMINALS - Apparatus and methods for power control for mitigation or control of interference in a wireless communications environment. Control techniques can consider the effect of interference on an access point and the access point can identify interfering wireless terminals and cause a message to be sent to a controlling access point of the interfering wireless terminal to cause the uplink power of the interfering wireless terminal to be adjusted.04-08-2010
20090305637System and Method for Minimizing Interference Between Rfid Reader - Disclosed is a method for minimizing interference between RFID readers built in a mobile terminal, it is possible to minimize interference between readers by assigning an operating time specific to the mobile terminal at a specific point of time of a cycle of a mobile communication network signal according to an identity number of a mobile terminal, even when several readers are scattered in a predetermined area and they try to detect one tag at the same time.12-10-2009
20090264077METHODS AND APPARATUS FOR UPLINK AND DOWNLINK INTER-CELL INTERFERENCE COORDINATION - A method for inter-cell interference coordination (ICIC) by a home evolved NodeB (HeNB) is described. A portion of bandwidth is reserved for a user equipment (UE). Notification of the reserved portion of bandwidth is sent to at least one potentially interfering evolved NodeB (eNB). A data exchange is performed with the UE using the reserved portion of bandwidth. Notification is sent to the potentially interfering eNBs releasing the reserved portion of bandwidth.10-22-2009
20090264076TRANSMITTER FOR COMMUNICATIONS SYSTEM - An rf signal transmitter for transmitting rf signals through a plurality of antennas is described, which comprises: a transmit section adapted to selectively set, with respect to an input signal, the initial phase of an output to at least one of said antennas depending on a time or frequency region used for communication and to provide delay to the output on an antenna-by-antenna basis and on the basis of a transmission timing or a transmission frequency; and a quality information receive section for receiving quality information from destination station, i.e., a wireless terminal unit, said quality information concerning the rf signal transmitted from said transmit section and received at said destination station.10-22-2009
20090291640SYSTEM AND METHOD TO ENABLE RESOURCE PARTITIONING IN WIRELESS NETWORKS - Systems and methodologies are described that facilitate improved resource partitioning and interference management in a wireless communication system. Techniques are described herein for the transmission and use of various types of signaling, such as Access Request commands, Reverse Link Special Resource Utilization Message (R-SRUM) signaling, Forward Link Special Resource Utilization Message (F-SRUM) signaling, and the like, for managing interference associated with range extension, restricted association networks, and other jamming scenarios. As described herein, downlink resource coordination and interference management are accomplished through the use of Access Request or R-SRUM signaling conducted in a unicast or broadcast fashion, and uplink resource coordination and interference management are accomplished through the use of F-SRUM signaling. As further described herein, a clean communication channel such as a Low Reuse Preamble (LRP) channel can be utilized for interference management signaling and/or leveraged for determining timing of various signaling messages.11-26-2009
20100099360DATA COMMUNICATION APPARATUS AND COMMUNICATION DATA CONTROL METHOD - A data communication apparatus includes a band-elimination filter configured to perform a process of reducing a specific frequency component included in transmission data, a packet producer configured to produce packet data including therein data outputted from the band-elimination filter, and an antenna configured to output the packet data produced by the packet producer, and further, the band-elimination filter is configured to reduce a frequency component corresponding to the reciprocal of a packet transmission cycle inherent in the packet data.04-22-2010
20090143016MOBILE COMMUNICATION SYSTEM, INTERFERENCE OF NEIGHBORHOOD SUPPRESSION METHOD AND BASE STATION IN THE SYSTEM - A mobile communication system, a neighboring cell interference suppression method and a base station in the mobile communication are disclosed. When a NodeB establishes a non-serving radio link for a UE, only a control plane connection is established, and contribution of the UE to uplink load in a cell is estimated by means of an established uplink channel so that contribution of UEs in neighboring cells to the uplink load becomes predictable, and the transmit power of the UE can be controlled by means of an established downlink channel based on the estimation result, and thereby interference from the neighboring cells to which the overlap area belongs can be suppressed effectively, and the system stability and accuracy in fast dispatching by the NodeB can be improved. If the non-serving radio link becomes a serving radio link during the handover, a channel for carrying data is added to the radio link.06-04-2009
20090170437SPEED ESTIMATION AND POWER CONTROL BASED ON CQI REPORTS - Systems and methodologies are described that facilitate utilizing different power control algorithms as a function of access terminal speed. For instance, instantaneous Channel Quality Indicator (CQI) reports can be inverted for slow moving access terminals while long-term geometry inversion (e.g., average CQI report inversion) can be utilized for quick moving access terminals. Speed of the access terminal can be estimated based upon time correlation of CQI values. Further, selection of implementing instantaneous CQI inversion or long-term geometry inversion can be based upon the estimated speed of the access terminal.07-02-2009
20090280747Method and Apparatus for Interference Cancellation in a Wireless Communication System - A mobile device estimates a data symbol from a received signal by using one or more interference cancellation algorithms. For one interference cancellation algorithm, the mobile device calculates a correction factor by estimating a Doppler speed and a time difference between a first time interval like a preamble symbol and a second time interval like any symbol of interest in an assigned data allocation in the data zone. Using the correction factor, the mobile device updates outdated interference information. The mobile device cancels interference in the received signal distorted by co-channel interference by using the updated interference information. Also, the mobile device is configured to combine results of multiple interference cancellation algorithms based on the applicability of the individual interference cancellation algorithms in particular scenarios.11-12-2009
20110171911METHOD FOR TRANSMITTING AND RECEIVING INTERFERENCE CONTROL SIGNALING IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting and receiving interference control signaling in the wireless communication system is provided by the present invention, wherein the transmitting method includes: a base station firstly selecting SPI values of a part of sub-bands in a sub-band set in which the frequency reuse factor is Reuse=n>1 according to SPI value selecting regulation of sub-bands, then forming interference control signaling, and finally transmitting the interference control signaling to all the terminals under the base station through a downlink channel. The SPI values of a part of sub-bands may be either SPI values of k07-14-2011
20110171910METHOD AND SYSTEM FOR RECEIVER NULLING USING COHERENT TRANSMIT SIGNALS - A method and system are provided for canceling interference signals from a received signal. A ratio module receives as input a ratio of a filtered receiver output signal level and a filtered transmitter output signal level. A product module receives as inputs an output of the ratio module and a transmitter output. The product module calculates a product of the output of the ratio module and the transmitter output. An adjusted receiver signal module receives a difference calculated from the received signal level and the output of the product module. The method and system are suitable for use in a metal detection subsystem with a larger security system.07-14-2011
20090275287WIRELESS VIDEO SURVEILLANCE JAMMING AND INTERFACE PREVENTION - A wireless video surveillance system with jamming and interference prevention capabilities.11-05-2009
20090286482SPATIAL INTERFERENCE MITIGATION SCHEMES FOR WIRELESS COMMUNICATION - Techniques for transmitting and receiving data with spatial interference mitigation in a wireless communication network are described. In one design, a cell may receive preceding information from a first user equipment (UE) communicating with the cell and spatial feedback information (SFI) from a second UE not communicating with the cell. The cell may select a preceding matrix based on the preceding information and the SFI. The preceding matrix may steer a transmission toward the first UE and away from the second UE. The cell may send a reference signal based on the preceding matrix, send a resource quality information (RQI) request to the first UE, receive RQI determined by the first UE based on the reference signal, and determine a modulation and coding scheme (MCS) based on the RQI. The cell may then send a data transmission to the first UE with the preceding matrix and in accordance with the MCS.11-19-2009
20100248635Sounding And Steering Protocols For Wireless Communications - The present disclosure includes systems, apparatuses, and techniques relating to wireless local area network devices. Systems, apparatuses, and techniques include communicating with multiple wireless communication devices to determine characteristics of spatial wireless channels, determining steering matrices based on one or more outputs of the communicating, and transmitting signals that concurrently provide data to the wireless communication devices via different spatial wireless channels. The signals can be spatially steered to the wireless communication devices based on the steering matrices.09-30-2010
20100248634METHOD OF CYCLIC DELAY DIVERSITY WITH THE OPTIMAL CYCLIC DELAY VALUE, AND TRANSMITTER PERFORMING THE SAME - Disclosed are an apparatus and method of determining an optimal cyclic delay value. The method of determining the optimal cyclic delay value includes determining a Signal-to-Interference and Noise Ratio (SINR) function depending on a diversity order; determining a channel estimation error variance function; and determining an SINR being required for a system according to the SINR function and the channel estimation error variance function.09-30-2010
20100248633SIGNAL CONDITIONING DEVICE WITH ATTENUATED FAIL-SAFE BYPASS - A signal conditioning device, and method thereof, that can be used to maintain an amount of signal RF level adjustment, which is applied to an input, independently of the availability of the power supplied to the device. In one embodiment, the signal condition device comprises an attenuating circuit, which can have a variable attenuator and a non-volatile attenuator. The variable attenuator is configured to provide a primary amount of signal RF level adjustment in a power-on state, and the non-volatile attenuator is configured to store as a secondary amount the primary amount of the signal RF level adjustment. The non-volatile attenuator is likewise configured so that the secondary amount can be applied when the signal conditioning device enters into a power-off state so as to modify the RF level of the input in order to maintain a relative strength of the transmission at a remote device.09-30-2010
20100248632METHOD AND APPARATUS FOR RF PROXIMITY AUTHENTICATION - Systems and methodologies are described that facilitate secure interference management in a wireless communication system. Techniques are described herein to enable a terminal jammed by a nearby base station to submit a request to the nearby base station to set aside interlaces and/or other communication resources while preventing attacks wherein such requests are submitted arbitrarily. As described herein, a base station receiving a request for reservation of resources can require proof that an entity requesting the reservation is actually jammed by the base station by constructing and transmitting a signal using random number and/or other information such that the information can be correctly decoded only at or above a minimum signal quality. A tiered technique is additionally described herein, wherein multiple signals are constructed and transmitted such that the respective signals are correctly decodable at varying signal quality thresholds.09-30-2010
20090170439CHANNEL ESTIMATION METHOD OPERABLE TO CANCEL A DOMINANT DISTURBER SIGNAL FROM A RECEIVED SIGNAL - A processing module produces improved main channel estimate. This process involves initially estimating the channel impulse response. This result is based on and combined with a known sequences such as that provided by training sequences of the midamble within RF bursts. From this combination, it is possible to produce an estimated signal from a convolution of the channel impulse response and midamble. The estimated signal may be cancelled or subtracted from the received signal to produce a clearer image of the disturber signal. A blind data recovery performed upon the disturber signal. The recovered disturber data may be used as a reference for disturber channel estimation in order to produce a disturber channel impulse response. With the estimated disturber channel impulse response and the recovered disturber data, an estimated disturber signal may be reconstructed and subtracted from the received signal. This allows the cancellation of the estimated disturber signal. Without a clear or dominant disturber signal, a better representation of the main channel impulse response may be produced. This results in more accurate processing of the received RF bursts and improved receiver performance.07-02-2009
20110207409ELECTROSTATIC DISCHARGE CIRCUIT USING INDUCTOR-TRIGGERED SILICON-CONTROLLED RECTIFIER - A representative electrostatic discharge (ESD) protection circuit includes a silicon-controlled rectifier comprising an alternating arrangement of a first P-type semiconductor material, a first N-type semiconductor material, a second P-type semiconductor material and a second N-type semiconductor material electrically coupled between an anode and a cathode. The anode is electrically coupled to the first P-type semiconductor material and the cathode is electrically coupled to the second N-type semiconductor material. The ESD protection circuit further includes an inductor electrically coupled between the anode and the second P-type semiconductor material or between the cathode and the first N-type semiconductor material.08-25-2011
20100144280METHOD AND SYSTEM FOR BITS AND CODING ASSIGNMENT UTILIZING EIGEN BEAMFORMING WITH FIXED RATES FOR CLOSED LOOP WLAN - A method and system for bits and coding assignment utilizing Eigen beamforming with fixed rates for a closed loop WLAN is provided. Aspects of the method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antennas and receiving feedback information related to the plurality of RF channels. Bits may be assigned for transmission via at least one of the plurality of RF channels based on the feedback information. At least a portion of subsequent data having at least a first coding rate based on the assignment of bits may be transmitted via at least one of the plurality of RF channels. The method may also comprise receiving data via a plurality of RF channels utilizing a plurality of receiving antennas, and transmitting feedback information related to the plurality of RF channels.06-10-2010
20100136917DEVICE FOR SUPPRESSING INTERFERENCE PHENOMENON BETWEEN CAPACITIVE DETECTION AREAS OF A SENSOR - The invention relates to a device for suppressing the interference phenomena between several detection areas (A, B) of a capacitive sensor (06-03-2010
20100197230METHOD, APPARATUS AND COMPUTER PROGRAM PRODUCT FOR PROVIDING CIPHERING PROBLEM RECOVERY FOR UNACKNOWLEDGED MODE RADIO BEARER - An apparatus for providing ciphering problem detection may include a processor. The processor may be configured to receive an unacknowledged mode message, initiate operation of a timer based on receipt of the unacknowledged mode message, re-initiate timer operation in response to each subsequent unacknowledged mode message received prior to expiration of the timer, record a timer expiry event in response to the timer expiring prior to receipt of a subsequent unacknowledged mode message, and indicate a data reception error in response to receipt of the subsequent unacknowledged mode message after recordation of the timer expiry event.08-05-2010
20100210215 Method and Apparatus for Reducing Link Interference by a Link Between a User Equipment Component and an Access Network Component - A method and apparatus are described for reducing link interference by a link between a user equipment component and an access network component. The user equipment component and access network component are connected by links over dedicated channels in respective directions, the link channel power in the first direction being controlled by the link channel in the second direction. A component sends a reconfiguration message to the other component to reconfigure to a common channel state in which the link channel power in the first direction is independent of the link channel in the second direction.08-19-2010
20080274698METHOD AND APPARATUS FOR INDICATING A TEMPORARY BLOCK FLOW TO WHICH A PIGGYBACKED ACK/NACK FIELD IS ADDRESSED - A method and an apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed. A method and apparatus of performing receive processing to reduce the probability of false acceptance of erroneous PANs are also disclosed. A transmit station generates a PAN check sequence (PCS) and performs a channel coding on a PAN field and the PCS. The transmit station scrambles the encoded bits of the PAN field and the PCS with a TBF-specific scrambling code. Because of the scrambling, the PCS decoding at a receive station will pass if the data block is received by an intended receive station, while the PCS decoding will fail if received by a non-intended receive station. Alternatively, the scrambling may be performed before the channel coding. Alternatively, the transmit station may combine the PAN field and a temporary flow identity (TFI) to generate a PCS.11-06-2008
20080280563METHOD AND SYSTEM FOR WIRELESS COMMUNICATIONS USING ANTI-INTERFERENCE TO INCREASE CHANNEL CAPACITY - A method and system for wireless communications between a sender and a receiver enables effective blocking of interference signals by other senders and improving the channel capacity. The receiver uses two or more receiving devices, such as antennas or smart antennas, to receive multiple wireless input signals. By performing a noise-transparent autocorrelation matching analysis on the multiple input signals, the receiver derives an anti-interference filter for interference-blocking action, without the need for information of the interfering vector. The information derived by the receiver may be further used to control the reception by the receiving devices of the receiver, or transmitted to the sender to control its transmission, such that the signal vector may be set to be parallel to the obtained filtering vector to achieve an enhanced channel capacity that may exceed the limit imposed by the well-known Shannon channel capacity of the original channel.11-13-2008
20080287067SYSTEM FOR CONTROLLING WIRELESS COMMUNICATION BETWEEN PORTABLE DEVICE AND COMMUNICATION CONTROLLER - A portable device for preventing communication errors caused by disturbance such as noise. The portable device receives a first request signal from a communication controller and transmits a first response signal corresponding to the first request signal. A transmitter transmits the first response signal with a selected one of a plurality of frequencies. A transmission control unit transmits the first response signal from the transmitter with the one of the plurality of frequencies. The portable device further receives a second request signal from the communication control unit, which receives the first response signal. When the second request signal cannot be received, the portable device retransmits the first response signal from the transmitter with a frequency that differs from the one of the plurality of frequencies.11-20-2008
20080293362Method for Polarization Correction in User Equipment - A method and device for compensation of received signal components at a user equipment (UE) used for receiving signal components from a radio base station (RBS). The signal components have at least a first and a second polarization orientation, respectively. The intended reception of the signal component (Yh(n)) having the first polarization deviates from the polarization orientation of the transmitted signal component (Xh(n)) having the first polarization by a first angle (φ), and the intended reception of the signal component (Yv(n)) having the second polarization deviates from the polarization orientation of the transmitted signal component (xv(n)) having the second polarization by a second angle (β). The method comprises the steps: determining the correlation values (Ryw, Ryvy, Ry11-27-2008
20110009064WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - A wireless communication apparatus 01-13-2011
20120295546RADIO COMMUNICATION SYSTEM, RADIO BASE STATION, NETWORK CONTROL DEVICE, AND COMMUNICATION CONTROL METHOD - An LTE base station (11-22-2012
20110207410INTERFERENCE MANAGEMENT MESSAGING INVOLVING TERMINATION OF A REQUEST FOR REDUCTION IN INTERFERENCE - A set of nodes may communicate in a manner that is asynchronous with respect to the communication between other sets of nodes. To facilitate reservations of resources by different nodes, a node may transmit a message that requests neighboring nodes to limit their interfering transmissions on a given resource and then transmit another message to inform the neighboring nodes that the node is no longer using the resource. To address problems that may be caused by concurrent asynchronous transmissions by different nodes, a messaging scheme may be used to enable a first node to acquire control information transmitted by asynchronous neighboring nodes while the first node was transmitting, and was thereby unable to receive control messages.08-25-2011
20100136915Wireless Communication Method and Apparatus Therefor - A wireless communication method for a wireless communication apparatus to communicate wirelessly with a corresponding wireless communication apparatus with adaptively selecting a modulation scheme from a plurality of modulation schemes, comprising: a step of grasping a quality of a received signal; a step of selecting a first modulation scheme based on the grasped quality of the received signal; a step of calculating a retransmission rate of received signals in the first modulation scheme; a step of determining an estimated throughput from the calculated retransmission rate based on relations between throughput and retransmission rate; a step of comparing the estimated throughput with a throughput in a second modulation scheme having a smaller multi-value number than that in the first modulation scheme; and a step of performing wireless communication in either the first modulation scheme or the second modulation scheme depending on the comparison result.06-03-2010
20090042512MOBILE COMMUNICATION SYSTEM, BASE STATION, AND INTER-CELL INTERFERENCE REDUCTION METHOD - Base stations (02-12-2009
20090124205PHYSICAL AND MAC ADAPTATION FOR INTERFERENCE MITIGATION WITH COGNITIVE RADIO - A communication device cognitively monitors interference signals across a communication band so that adaptations for physical and medium access control (MAC) of data packet transmissions are appropriate for a particular interference signal. Characteristics of an interference signal of interest (e.g., bandwidth, power and/or duration relative to an average data packet transmitted over a communication channel of the communication device) are sensed for an appropriate adaptation (e.g., forward error correction, modulation technique, back off, request to send/clear to send protocol, etc.). Patterns for known types of interference sources can be compared so that when recognized an associated adaptation can be used.05-14-2009
20100144281APPARATUS AND METHOD FOR REMOVING INTERFERENCE SIGNAL USING SELECTIVE FREQUENCY PHASE CONVERTER - An apparatus and method for removing an interference signal using a selective frequency phase converter are disclosed. The apparatus for removing an interference signal using a selective frequency phase converter includes: a first phase converter configured to convert a phase of a received RF signal to differentially output first and second signals having a phase difference of 180° from each other; a second phase converter configured to receive the first signal and selectively convert the phase of a particular frequency band; a third phase converter configured to receive the second signal and selectively convert the phase of a particular frequency band; a timing controller configured to correct a signal delay time between the output from the second phase converter and that of the third phase converter; and an adder configured to add an output from the second phase converter and an output from the third phase converter, wherein the second and third phase converters phase-convert the first and second signals such that the phases of the signals of the particular frequency bands do not have a phase difference of 180° from each other.06-10-2010
20090298434INTERMEDIATE FREQUENCY SIGNAL LOSS COMPENSATION CIRCUIT - An exemplary intermediate frequency (IF) signal loss compensation circuit for an outdoor unit of a communication system includes a sending circuit, a detection circuit, a receiving circuit, and a control circuit. The detection circuit detects in substantially real-time the loss of signal transmitted via a cable from the indoor to the outdoor unit, and transmits loss signal to the control circuit. The control circuit compares the loss signal with a pre-stored signal to determine the loss and then, the control circuit gives loss signals of the sending circuit a variable gain compensation according to the loss. The control circuit also gives loss signals of the receiving circuit a variable gain compensation in advance. The IF signal loss compensation circuit can detect the IF signal loss in substantially real-time, giving the IF signal a variable gain compensation for the loss.12-03-2009
20090137208Transmitter And Receiver Using Asymmetric Transfer Characteristics in Differential Amplifiers To Suppress Noise - An output amplifier is provided for use in a bidirectional communications interface, for example, connecting a transmitter and a receiver to a transmission line. The output amplifier includes a differential amplifier pair connected to output circuitry. The differential amplifier pair receives differential data signal pairs from each of a transmission line and a transmitter. The output circuitry receives signals from the differential amplifier pair and, in response, forms single-ended output logic signals. The output amplifier suppresses electronic input noise throughput using an asymmetric transfer characteristic that offsets output signal logic levels with respect to input noise signal levels. The asymmetric transfer characteristic is produced by skewing a transfer characteristic of the differential amplifier pair using an asymmetrical transistor configuration at an output side of the differential amplifier pair. The output logic signals represent data received on the transmission line, and are provided to the receiver.05-28-2009
20090163143METHOD FOR DETERMINING AND COMPENSATING TRANSCEIVER NON-IDEALITIES - A method for estimating transceiver non-idealities is disclosed. In one aspect, the method comprises generating a preamble comprising multiple sets of known training sequences with a synchronization part preceding an estimation part. The training sequences in the estimation part comprises at least two sequences which are (i) complementary Golay sequence pairs and (ii) selected to satisfy a predetermined correlation relationship chosen for estimation of a first non-ideality characteristic. A first estimate of a non-ideality characteristic is determined on the basis of the known training sequences of the synchronization part of the received preamble. The estimation part of the received preamble is compensated by this estimate. Another non-ideality characteristic is determined by the compensated estimation part, exploiting the predetermined correlation relationship.06-25-2009
20090186582SYSTEM AND METHOD FOR TRANSMISSION INTERFERENCE CANCELLATION IN FULL DUPLEX TRANSCEIVER - A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.07-23-2009
20090325496METHOD OF REDUCING INTRA-CELL SPATIAL INTERFERENCE IN A MOBILE CELLULAR NETWORK - The invention concerns a method of reducing intra-cell spatial interference and a multiple antenna mobile station: A base station (12-31-2009
20100159837Own Transmitter Interference Tolerant Transceiver and Receiving Methods - Circuits and methods are disclosed for reducing interference from transmitter leakage in a radio transceiver. An exemplary method for reducing interference from transmitter leakage in a radio transceiver comprises downconverting, filtering, and sampling a radio frequency signal comprising a desired signal and a transmitter leakage signal to obtain a sampled signal of interest. The method further comprises generating a sampled distortion signal estimate that estimates one or more distortion products of the transmitter leakage signal, such as a squared amplitude obtained from a square-law device or corresponding digital function. Further, the method comprises dividing the sampled distortion signal estimate and the sampled signal of interest into a plurality of frequency channels. Finally, for a selected number of frequency channels, the method comprises combining the sampled distortion signal estimate for a frequency channel with the corresponding sampled signal of interest for the same frequency channel to obtain interference-reduced signal samples for the frequency channel.06-24-2010
20110143674METHOD FOR AVOIDING INTERFERENCE IN MOBILE COMMUNICATION SYSTEM - Provided is an interference avoiding method in a mobile communication system. A base station detects a preamble signal of another base station during an initial setting process or a time frame of a downlink transmission section to detect an adjacent interference base station or receive a report of information on the adjacent interference base station detected by a mobile station from the mobile station. When an adjacent interference base station is detected, the base station sets a common bandwidth from among the entire usage bandwidth as an interference avoiding bandwidth according to a defined rule. The base station allocates a subchannel in the interference avoiding bandwidth to a mobile station in a cell edge area adjacent to a cell of an interference base station.06-16-2011
20090061780WIRELESS COMMUNICATION DEVICE AND SIGNAL DETECTION CIRCUIT - A wireless communication device includes: a wireless communication unit that is configured to: perform a wireless communication in a first mode using a first frequency band serving as a first communication channel; and perform the wireless communication in a second mode using a second frequency band including the first communication channel and a second communication channel that is adjacent to the first communication channel; a detection unit that is configured to: monitor each of the first frequency band and the second frequency band; output a first detection signal when an interference signal is detected in the first frequency band; and output a second detection signal when the interference signal is detected in the second frequency band; and a determination unit that determines whether the interference signal is in the first communication channel or in the second communication channel based on the first and second detection signals.03-05-2009
20090075597DEVICE, SYSTEM, AND METHOD OF LOW-NOISE AMPLIFIER - Device, system, and method of low-noise amplifier. For example, an apparatus includes a low-noise amplifier to convert a single-ended wireless communication signal into a corresponding differential signal.03-19-2009
20110223867Methods for reducing interference in communication systems - Example embodiments are directed to methods of reducing interference in a communication system. A method includes receiving, by a transmitter, first and second quantized matrices from a mobile station. The first and second quantized matrices are based on an estimated channel matrix and an estimated interference matrix. The method further includes determining, by the transmitter, a transmission beamforming vector based on the first and second quantized values.09-15-2011
20090203320ASYNCHRONOUS INTERFERENCE MANAGEMENT BASED ON TIMESLOT OVERLAP - Interference management may involve the transmission of interference management messages by wireless nodes that are experiencing interference and appropriate responses by potential interferers that receive the interference management messages. Upon detection of interfering signals, a wireless node may determine whether the signals are from a synchronous interferer or an asynchronous interferer. Based on this determination, the wireless node may use different types of signals to manage the different types of interference. In some aspects, asynchronous interference management may involve backing-off in frequency and/or in time in response to interference signals. Asynchronous interference management may involve transmitting back-off beacons to clear potential interferers from a given carrier. Here, the transmission of beacons by a wireless node may be metered to facilitate fair sharing of communication resources.08-13-2009
20090004972METHOD FOR OPERATING A WIDE AREA NETWORK MODEM AND A PERSONAL AREA NETWORK MODEM IN A MOBILE COMMUNICATION DEVICE - A mobile communication device (01-01-2009
20110143672METHOD AND SYSTEMS FOR PARALLEL CHANNEL ESTIMATION AND INTERFERENCE CANCELLATION - Certain aspects of the disclosure propose parallel channel estimation and interference cancellation in a wireless communications system. For each common reference signal tone offset, interference cancellation and channel estimation may be performed independently. The proposed channel estimation method may increase performance of a system.06-16-2011
20090221236PRE-ENCODING AND PRE-DECODING APPARATUSES AND METHODS THEREOF - A pre-encoding apparatus and a pre-decoding apparatus are provided. The pre-encoding apparatus adopts a cascade structure constituted by a plurality of pre-encoding units and a plurality of interleavers for pre-encoding, and the pre-decoding apparatus adopts a cascade structure constituted by a plurality of pre-decoding units and a plurality of de-interleavers for pre-decoding. Therefore, the pre-decoding apparatus is featured with a lower error rate. Also, each of the pre-decoding units can be alternatively composed of a plurality of low dimensional pre-decoders so that a computation complexity of the pre-decoding apparatus can be reduced accordingly.09-03-2009
20090247084SHORT-TERM INTERFERENCE MITIGATION IN AN ASYNCHRONOUS WIRELESS NETWORK - Techniques for mitigating interference in an asynchronous wireless network are described. A terminal may desire to communicate with a serving base station and may observe high interference from other base stations. In an aspect, some frequency resources may be reserved for sending reduce interference requests and pilots to support interference mitigation. In one design, a first station (e.g., a terminal) may send a request to reduce interference to at least one interfering station on reserved control resources. The first station may receive a pilot sent by each interfering station on reserved pilot resources. The reserved resources may be associated with data resources. The first station may estimate received signal quality of the data resources based on the pilot(s). The first station may receive data sent on the data resources by a second station (e.g., a serving base station) after the interfering station(s) have reduced interference.10-01-2009
20090239472Apparatus and method for removing interference in multiple antenna system - Provided are an apparatus and a method for removing an interference in a multiple antenna system. The apparatus includes a channel estimator, a covariance matrix generator, a weight calculator, and a beam forming unit. The channel estimator estimates a channel for a service cell and an interference channel for an adjacent cell using sounding signals via a plurality of antennas. The covariance matrix generator generates a covariance matrix as an average value from the interference channel. The weight calculator calculates a beam coefficient using the covariance matrix. The beam forming unit forms a beam using the beam coefficient.09-24-2009
20100015921WIRELESS COMMUNICATION SYSTEMS WITH FEMTO CELLS - Systems and methods for avoiding interference signals sent by a femto node in a wireless communication system are described herein. In one embodiment, the method comprises establishing a communication link between a first transceiver and a base station. The base station is configured to provide wireless communication coverage within a first area. The method further comprises detecting by the first transceiver a femto signal generated by the femto node. The femto node is configured to provide wireless communication coverage within a second area to at least a second transceiver. The second transceiver is different from the first transceiver. The second area is smaller than the first area. The method further comprises identifying information indicative of a signal strength of the femto signal. The method further comprises transmitting a first message in response to detecting the femto signal, the first message comprising information identifying the femto node and the information indicative of the signal strength of the femto signal to the base station over a first frequency carrier. The method further comprises receiving a second message from the base station. The second message comprises information indicative of an instruction to communicate over a second carrier frequency. The method further comprises communicating with the base station over a second frequency carrier in response to the second message.01-21-2010
20100015922RADIO TRANSMISSION SYSTEM AND INTERFERENCE COMPENSATION METHOD - A radio transmission system includes a MIMO reception processing unit for performing reception-side MIMO processing to output a plurality of reception modulated signals respectively corresponding to a plurality of unique paths. The system further includes an interference compensation unit for compensating inter-path interference contained in the plurality of reception modulated signals.01-21-2010
20090047907COMMUNICATION SYSTEM, COMMUNICATION APPARATUS AND COMMUNICATION CONTROL METHOD - To adjust reception sensitivity suitable for avoiding cross-interference with another wireless communication system with an easy method. In order to achieve the above object, a control station that controls wireless communication of a dependent station determines whether or not a beacon received by the dependent station includes a beacon transmitted by a wireless terminal that is operated in asynchronization with the control station, and continues to transmit an instruction to lower the reception sensitivity of the dependent station to the dependent station until the beacon received by the dependent station does not include a beacon transmitted by the asynchronous wireless terminal.02-19-2009
20090047906METHOD AND SYSTEM FOR MICROWAVE DETECTION - Disclosed are a method and system for triggering a wireless device to perform sensing of wireless spectrum to detect microwave signal interference in a wireless medium. The wireless device transmits one or more packets and checks the status of transmission for each packet. Based on the status of transmission of the packet, counters are updated. Symbols are generated to correspond to an ON/OFF pattern of an interference signal, when the counters exceed a pre-defined threshold value. A plurality of symbols corresponding to transmission of one or more packets forms a sequence. The sequence is compared with a pre-defined pattern. The occurrence of a match between the sequence and the pre-defined pattern signifies presence of a periodic interference signal. Sensing of wireless spectrum is then triggered to detect microwave signal interference.02-19-2009
20100197232Echo Canceler Circuit And Method - Received data is filtered to produce pre-noise suppression data. Noise is removed from the pre-noise suppression data to provide noise-suppressed data. At least one weighted filter coefficient is dynamically determined using at least the pre-noise suppression data and not the noise suppressed data. The determination occurs independently from and is not affected by removing the noise from the pre-noise suppression data. Removing the noise from the pre-noise suppression data occurs independently from and is not affected by dynamically determining the at least one weighted coefficient.08-05-2010
20090298435TRANSMISSION APPARATUS, RECEPTION APPARATUS, TRANSMISSION SYSTEM WHICH COMBINES THESE, AND TRANSMISSION AND RECEPTION METHOD THEREOF - A transmission apparatus, a reception apparatus, a transmission system which combines these, and a transmission and reception method thereof are provided. The transmission apparatus includes a first transmission unit which transmits data via a channel in a first band, a second transmission unit which transmits data via a channel in a second band, and a transmission control unit which controls the first transmission unit to stop transmitting the data via the channel in the first band if interference is sensed in the channel in the first band. Accordingly, data can be provided without data interruption in a wireless environment where there is interference.12-03-2009
20100227562METHOD AND APPARATUS FOR ELIMINATING MULTI-USER INTERFERENCE IN MULTI-ANTENNA SYSTEM - A method and an apparatus are provided for eliminating multi-user interference in a multi-antenna system. In a BS, precoding vector information of at least one interfering user terminal interfering with a user terminal and information about a ratio of the transmission (TX) power of the user terminal to the total TX power of the BS are detected. A control signal including the detected information is transmitted to the user terminal.09-09-2010
20100159838UPLINK MULTI-CELL SIGNAL PROCESSING FOR INTERFERENCE SUPPRESSION - A node (e.g., base station, signal processing unit) is described herein that includes a symbol detector and a method which are capable of suppressing interference caused by one user device (which may be in softer handoff mode) to reduce performance degradation to other intra-cell user devices and/or other inter-cell user devices (which may not be in softer handoff mode).06-24-2010
20100216405System and method for interference reduction in self-optimizing networks - A method for interference management in a self optimizing network includes determining quality of service constraints for a call; mapping the quality of service constraints for the call to a target signal-to-interference noise ratio; and transmitting power control signals for the call based on the target signal-to-interference noise ratio. The utility function can be optimized for each class of calls over the network so as to maximize the total number of calls that can be handled.08-26-2010
20100227560METHOD AND APPARATUS FOR ESTIMATING TIME OF ARRIVAL - Method and apparatus are provided for estimating Time of Arrival (“TOA”). The method includes: performing channel estimation according to a Normal Burst (“NB”) free of interference and a local training sequence and generating a channel estimate, performing TOA estimation according to the channel estimate, and adjusting a synchronization position of the current NB according to a TOA estimation result. Interference to signals is cancelled before the TOA estimation, thus overcoming energy estimate deviation arising from interference in a strongly interfering radio environment, as occurs in the prior art, and preventing the impact on the TOA estimation. The disclosed methods and apparatus provide for more accurate energy estimates in a strongly interfering radio environment. The technical solution under the present invention does not require adjustment of the method of adjusting the search window.09-09-2010
20100210214METHOD FOR REDUCING TIME OF FLIGHT INTERFERENCE IN A WIRELESS COMMUNICATION NETWORK - A method for identifying time of flight interference in a wireless communication network is provided. The method includes detecting interference during a first uplink sub-frame at an interference destination base station, and transmitting a time of flight interference source detection request to a gateway, where the time of flight interference source detection request comprises a time of flight interference period. The method also includes determining one or more base stations in the vicinity of the interference destination base station, where the one or more base stations in the vicinity of the interference destination base station operate at a same frequency as the interference destination base station. The method further includes instructing the one or more base stations in the vicinity of the interference destination base station to re-transmit a preamble at least once in a downlink sub-frame, decoding a first preamble of a first interference source base station at the interference destination base station during a second uplink sub-frame, and identifying the first interference source base station based on the first preamble.08-19-2010
20120034875RADIO APPARATUS - A radio apparatus capable of correcting a direct current offset with high accuracy in a short time is provided. A radio apparatus according to an embodiment includes a first amplifier amplifying a signal inputted to an input terminal with amplification gain determined by a variable resistor to generate a first amplified signal, and a second amplifier amplifying the first amplified signal to generate a second amplified signal. Further, the radio apparatus includes a first correcting unit correcting a direct current offset of the first amplifier, and a second correcting unit correcting a direct current offset of the second amplifier. The radio apparatus also includes a reference voltage source or reference current source supplying a reference voltage or reference current for referring a direct current offset to the first amplifier and the second amplifier, again controller controlling the amplification gain of the first amplifier; and a correction controller controlling the gain controller to set the amplification gain to maximum and controlling the first and second correcting units to perform correction of the second correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the second amplifier, and thereafter perform correction of the first correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the first amplifier.02-09-2012
20100197233Method and System for Automatic Control in an Interference Cancellation Device - Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.08-05-2010
20100197234Method and Apparatus for Co-Location of Two Radio Frequency Devices - A method for avoiding signal interference between a first RF device and a second RF device is provided. The first and second RF devices are co-located and the first RF device is configured to operate within a semi-stationary range of a frequency band. The second RF device is configured to operate by changing channels within the frequency band. The method initiates with a communication interface being provided between the first RF device and the second RF device. Then, the second RF device receives the semi-stationary range and a mode for the first RF device through the communication interface. Next, the second RF device is adapted to avoid the semi-stationary range of the frequency band of the first RF device when the mode of the first RF device is in an active mode. An apparatus where two RF devices are co-located without causing interference for each other is also provided.08-05-2010
20100197231METHOD AND APPARATUS FOR INTERFERENCE CANCELLATION - An interference canceller between a transmit chain and a receive chain of a transceiver is proposed to complement the action of a diplexer, or duplex filter, that is part of the transceiver. The interference canceller comprises a transmit chain tap, a receive chain coupler for coupling an interference compensation signal into the receive chain, and an interference signal processing path between the transmit chain tap and the receive chain coupler. The interference signal processing path comprises a filter having filtering characteristics similar or corresponding to the filtering characteristic of a receive portion of said diplexer. A corresponding method for interference cancellation is also proposed. Computer-program products for the manufacture of the interference canceller and the execution of the method are also proposed.08-05-2010
20090325495SYSTEM AND METHOD TO DETERMINISTICALLY AND DYNAMICALLY PREVENT INTERFERENCE TO THE OPERATION OF SAFETY-OF-LIFE RADIO EQUIPMENT - A system to deterministically and dynamically prevent interference to the operation of safety-of-life radio equipment in a vehicle is provided. The system includes a radio management system and a wireless network frequency controller communicatively coupled to the radio management system. The wireless network frequency controller is operable to restrict the operational frequency of any one or more of internal wireless communication devices and any one or more of wireless sensors that are communicatively coupled to the wireless network frequency controller. The restriction of the operational frequency is based on input from the radio management system. The restriction of the operational frequency ensures that all the safety-of-life radio equipment has interference-free operation with the internal wireless communication devices and the wireless sensors that are communicatively coupled to the wireless network frequency controller.12-31-2009
20100297947MULTI-MODE PROGRAMMABLE ANTENNA WITH CONFIGURATION CONTROL AND METHODS FOR USE THEREWITH - An antenna configuration controller configures a programmable antenna via a configuration procedure. The configuration procedure includes evaluating first candidate antenna configurations, based on quality data corresponding to each configuration, wherein the quality data includes mode interference data. A selected antenna configuration is identified when the quality data corresponding to the selected antenna configuration compares favorably to a quality threshold. A first proper subset of the first candidate antenna configurations is selected when the quality data corresponding to the first candidate antenna configurations compares unfavorably to the quality threshold; and second candidate antenna configurations are generated, based on the first proper subset. The second candidate antenna configurations are evaluated, based on the quality data corresponding to each of the configurations; and a selected antenna configuration is identified from the second candidate antenna configurations, when the quality data corresponding to the selected antenna configuration compares favorably to the quality threshold.11-25-2010
20110117853SYSTEM AND METHOD FOR REDUCING RADIO FREQUENCY INTERFERENCE - A system and method for determining the source of and/or reducing radio frequency interference in an RF communications system is disclosed. The system and method is configured to compare first transmission data and second transmission data for conflicts and provide notification of a conflict to a relevant entity. The first transmission data can include first frequency data, first destination data, and first time data for an RF transmission associated with the first RF device. The second transmission data can include second frequency data, second destination data, and second time data. The system and method analyzes the first transmission data and the second transmission data for any conflicts and can provide notification of any conflicts or potential conflicts to interested parties.05-19-2011
20100297948COPING WITH DISTORTION CAUSED BY WIDEBAND NOISE - A digital broadband broadcast receiver is configured to receive bits transmitted in transmission symbols, such as orthogonal frequency division multiplexing (OFDM) symbols. The reliability of the received bits is scaled with a non-linear scaling function which is in relation to the amount of interfered part of a received transmission symbol. In the scaling, a burst state information (BSI) and/or channel state information (CSI) method can be used.11-25-2010
20100304679Method and System For Echo Estimation and Cancellation - Methods and systems for echo estimation and cancellation are disclosed and may include estimating combined echo return loss and echo return loss enhancement (ERL+ERLE). A subband gain vector may be calculated utilizing non-linear processing, subband analysis, and the estimated ERL+ERLE to mitigate residual echo. ERL+ERLE may be estimated by averaging a difference in DL and UL signals. A maximum value of ERL+ERLE may be determined over a period of time. A non-linear distortion adjustment factor may be estimated for ERL+ERLE. An ERL+ERLE estimation error may be calibrated specific to the wireless device. The estimating of ERL+ERLE may be suspended briefly after a transition in the DL or UL signals. Comfort noise may be added to mask the residual echo, which may be mitigated following a dual echo canceller. The estimating may be suspended when the DL signal is not present. A noise level may be included in the gain calculation.12-02-2010
20100317291METHODS AND APPARATUS FOR CONTROLLING RESOURCE USE IN A WIRELESS COMMUNICATIONS SYSTEM - Methods and apparatus for detecting, controlling and/or mitigating interference are described. Various embodiments are well suited to wireless communications systems in which shared communications resources are used, e.g., in a peer to peer communications systems lacking centralized control. In some embodiments, a communications device receives signals on shared communications resource, evaluates its capability to decode a received signal, and conditionally transmits an interference signal, e.g., on the shared communications resource. The interference signal is intended to cause a device transmitting on the shared communications resource to switch to a different communications resource, e.g., in response to the interference signal, so that its transmitted signal can be successfully decoded. In at least one embodiment, the shared communications resource is a peer discovery air link resource associated with a peer discovery resource identifier.12-16-2010
20110111702Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information.05-12-2011
20090068953METHODS AND APPARATUSES FOR MINIMIZING CO-CHANNEL INTERFERENCE - Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first frame using a first scrambling code, attaching a first header to the first frame to create the first signal, scrambling a second frame using a second scrambling code, attaching a second header to the second frame to create the second signal, and transmitting the first signal and the second signal over different channels of the communication system.03-12-2009
20100323624METHOD AND APPARATUS FOR SELECTIVELY APPLYING INTERFERENCE CANCELLATION IN SPREAD SPECTRUM SYSTEMS - The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger.12-23-2010
20110117854HIGH SPEED MINIMAL INTERFERENCE ADAPTIVE TRANCEIVER INTERFACE AND METHOD THEREOF - A method for minimizing undesired signal coupling from digital interface between peripherals is presented. The method includes transmitting over the interface first and second signals having a parameter ζ05-19-2011
20110130098SYSTEMS, APPARATUS AND METHODS FOR DISTRIBUTED SCHEDULING TO FACILITATE INTERFERENCE MANAGEMENT - Systems, methods, apparatus and computer program products for facilitating interference management on a downlink of a wireless communication system are provided. In some embodiments, the method can include determining, by a base station within a cell, a benefit to out-of-cell user equipment when a base station transmits with certain transmission attributes, wherein the transmission attributes are at least one of a transmit power, beamforming vector or multiple input multiple output transmission; determining, by the base station, a benefit to a user equipment within the cell when the base station transmits with certain transmission attributes; and determining, by the base station, the total benefit to the out-of-cell user equipment and to the user equipment within the cell.06-02-2011
20090088079METHOD AND SYSTEM FOR UTILIZING UNDERSAMPLING TO REMOVE IN-BAND BLOCKER SIGNALS - Methods and systems for wireless communication are disclosed and may include band-limiting a wireless signal utilizing a programmable bandpass filter, generating a first signal by undersampling utilizing a clock signal and generating a second signal by undersampling the signal utilizing a delayed version of the clock signal, which may then be subtracted from the first signal. The filter may comprise a microstrip or a coplanar waveguide bandpass filter. The delay may be variable, and may be defined as an inverse of a frequency difference between the desired channel and a blocker signal. The bandwidth of the filter may be centered at the desired channel. The clock signal may be generated at a frequency which may be an integer sub-harmonic of the desired channel, and may be greater than twice a bandwidth of the filter. The delay may be controlled by a programmable delay circuit, which may comprise CMOS inverters.04-02-2009
20110124290MIMO Mode Switch Management for Beamformed MIMO Systems - Techniques are provided herein for improving multiple-input multiple-output (MIMO) wireless communications, and in particular to dynamically determining when to switch MIMO transmission modes on a communication link between two devices that are capable of supporting multiple MIMO transmission modes. A base station receives from a client device one or more signals containing information representing a first signal-to-noise ratio (SNR) measurement and a second SNR measurement made by the client device. The first SNR measurement is associated with a first MIMO transmission mode and the second SNR measurement is associated with a second MIMO transmission mode. The base station computes a MIMO channel quality indicator from the first SNR measurement and the second SNR measurement, and evaluates the MIMO channel quality indicator to determine whether to switch MIMO transmission modes for transmissions to the client device.05-26-2011
20100227561METHOD AND SYSTEM FOR REDUCING FEEDBACK INFORMATION IN MULTICARRIER-BASED COMMUNICATION SYSTEMS BASED ON TEMPORAL CORRELATION - Systems and methods for decreasing the amount of information sent on a feedback channel are disclosed. Spectral binning and/or a Markov state model may be used to reduce the amount of information sent on the feedback channel.09-09-2010
20100222002RADIO-COMMUNICATION MODULE COMPRISING EMISSION MEANS CONTROLLED BY INTERFERENCE DETECTION MEANS AND CORRESPONDING DEVICE AND USE - A radiocommunication module is provided, which includes a transmitter with a first mode of communication in at least one first frequency band. The module also includes: an interference detector for emitting a warning signal if interference is detected; and a controller for controlling the transmitter in such a way that it is able to switch between the first mode of communication and a second mode of communication which is different from the first mode, if the interference detector emits the warning signal.09-02-2010
20090054000Apparatus and Method for Adaptive Polar Transmitter Linearization and Wireless Transmitter Employing the Same - A polar transmitter and a method of linearizing a polar transmitter. In one embodiment, the transmitter includes: (1) a transmit chain having a predistorter configured to employ first amplitude and phase compensation lookup tables to carry out predistortion in the transmit chain, (2) a receiver coupled to the transmit chain and (3) predistortion compensation circuitry associated with the receiver and configured to update second amplitude and phase compensation lookup tables associated therewith based on at least one signal from the transmit chain, the values in the updated second amplitude and phase compensation lookup tables thereby available for subsequent predistortion.02-26-2009
20100056058METHOD AND APPARATUS FOR MITIGATING RADIO FREQUENCY INTERFERENCE IN A PLATFORM - A method to mitigate non-Gaussian Radio Frequency Interference (RFI) in a platform. Non-gaussian RFI is sensed in the received Inphase and Quadrature (IQ) data from a radio coupled with the platform. The parameters associated with a noise model from the IQ data are determined and the platform is reconfigured based on the parameters.03-04-2010
20100056060WIRELESS POCKET TRANSMITTER - There is provided a wireless pocket transmitter comprising an input for receiving signals of a guitar, a capacitance adjusting unit for adjusting an input capacitance of the pocket transmitter, and a wireless transmitter.03-04-2010
20100056059SYSTEMS AND METHODS FOR ADAPTIVE BEAMFORMING IN INDOOR WIRELESS NETWORKS - Systems and methods are disclosed for transmitting signals between a transmitter and a receiver by differentially estimating channel coefficients for each of the antenna elements relative to a reference antenna element; determining beam weights to remove oscillator induced phase or offset; and applying a correction (beamforming solution) at the transmitter to make the phase of the received signal from different antenna elements to be coherently combined at the receiver.03-04-2010
20100056061POWER SPECTRUM DENSITY CONTROL FOR WIRELESS COMMUNICATIONS - Systems and methodologies are described that facilitate adjusting power spectrum density (PSD) for wireless devices according to multiple possible step sizes. A step size for an adjustment can be selected based at least in part on a received overload indicator from one or more access points, a PSD required to achieve a target signal-to-interference-and-noise ratio (SINR) for a wireless device, and a PSD previously assigned to the wireless device. Once the step size is selected, it can be applied to the previous PSD to generate a new PSD for the wireless device, and the wireless device can accordingly adjust PSD to mitigate inter-cell interference with the one or more access points.03-04-2010
20100069009Adaptively Selecting Channel Filters for Multi-Carrier Edge - The dual-mode processor and corresponding method described herein selectively switches between a single-frequency mode, such as appropriate for an EDGE network, and a multiple-frequency mode, such as appropriate for a multi-carrier EDGE network. The pulse-shaping filters used during the multiple-frequency mode have a different filter response than the single-channel filter used during the single-frequency mode. The filter response of the pulse-shaping filters used during the multiple-frequency mode reduces cross-channel interference caused by the data symbols of two or more adjacent frequency channels that have the same or similar modulation and power level.03-18-2010
20100056062Beamforming by Sector Sweeping - A method for beamforming in a communication system includes receiving a first plurality of training data units via a plurality of antennas, applying a different steering vector as each training data unit is received, generating a first plurality of quality indicators based on the first plurality of received training data units, such that each of the first plurality of quality indicators corresponds to a respective one of the first plurality of received training data units, and selecting a steering vector based on the different steering vectors and the first plurality of quality indicators.03-04-2010
20100062717ASYMMETRICAL MULTICARRIER INTERFERENCE AVOIDANCE - A system and methods for asymmetrical multicarrier interference avoidance in a communication from a network to a subscriber device. The asymmetrical multicarrier interference avoidance technique comprises measuring signal-to-noise ratio interference values and sorting the measured values into two tables for selecting an anchor and a non-anchor frequency carrier pairs. The system is self-tuning based on changes in the network, the subscriber and the surrounding environment.03-11-2010
20110098003METHOD AND SYSTEM FOR PROCESSING MULTIPATH SIGNALS TO SUPPRESS INTERFACE UTILIZING A PROGRAMMABLE INTERFACE SUPPRESSION MODULE - Multipath signals are processed to suppress interference utilizing a programmable interface suppression module. One or more circuits that are operable to retrieve at least a portion of stored data from a memory, wherein the stored data corresponds to signals received via a particular receiving antenna and assigned to a particular finger in a rake receiver. A plurality of weighting factor values may be computed based on one or more signals received via the particular receiving antenna. Estimated signals may be generated based on the portion of stored data and the plurality of weighting factors. Residual signals may be generated based on the portion of stored data and the estimated signals. The portion of stored data may be replaced in the memory with corresponding data generated utilizing the residual signals. A plurality of interference suppressed signals may be generated based on the plurality of residual signals.04-28-2011
20110081865System and Method for Inter-Cell Interference Coordination - A system and method for inter-cell interference coordination is provided. A method for controller operation includes receiving interferer information from a device served by the controller, scheduling a cell edge device based on the received interferer information, and reporting usage information of the subset of resources to neighboring controllers. The cell edge device operates in a periphery of a coverage area of the controller, and the cell edge device is scheduled to a subset of resources. The method also includes from each neighboring controller, receiving neighboring usage information of a neighboring subset of resources reserved for cell edge devices served by the neighboring controller. The method further includes scheduling a cell center device based on the received usage information from the neighboring controllers, and transmitting to scheduled devices over their respective scheduled resources. Cell center device is scheduled to resources not in the subset of resources.04-07-2011
20110081864MITIGATING INTERFERENCE USING COOPERATIVE SCHEDULING - Among other things, a method performed by a first access point is described. The method includes outputting signals. At least some of the signals interfere with communication between a device and a second access point. The method also includes determining whether to output the signals in a predefined mode based on dynamically calculated values of a parameter. The parameter is related to signal interference at the device. If it is determined to output the signals in the predefined mode, for a time period, the first access point outputs signals in the predefined mode.04-07-2011
20110076954METHOD AND SYSTEM FOR INTERFERENCE REDUCTION - A method and system for interference reduction for telecommunication systems are disclosed. The system comprises a base station control device (BCD) for configuring one or more parameters for operating one or more base stations (BSs), a first BS covering a first cell having one or more mobile terminals therein, a second BS covering a second cell neighboring to the first cell and sharing a predetermined frequency band with the first cell, wherein one or more radio frames constructed for communications between the first BS and any mobile terminal of the first cell and one or more radio frames constructed for communications between the second BS and any mobile terminal of the second cell are distinguishable by defining different channel configuration sets having one or more operation parameters, wherein the parameters includes a training sequence, a spreading code, and a channel observation window position.03-31-2011
20110070839APPARATUS AND METHOD OF FEEDBACK CANCELLATION FOR RADIO SIGNAL - A feedback signal cancellation apparatus includes a first RF receiver configured to down-convert a received RF signal to a predetermined frequency band, a subtractor configured to subtract a replica of a feedback signal from the down-converted signal, a transmission signal generator configured to generate a repeater output signal using a feedback cancelled signal, a RF transmitter configured to transmit the repeater output signal, a second RF receiver configured to down-convert a RF signal outputted from the RF transmitter to a predetermined frequency band, a reference signal generator configured to receive the RF signal and generate a reference signal having no DC pilot, and a replica generator configured to generate a filter coefficient using correlation between the feedback cancelled signal and the reference signal and to generate a replica of the feedback signal using the generated filter coefficient and the down-converted signal of the second RF receiver.03-24-2011
20110151792Method for second intercept point calibration based on opportunistic reception - A transceiver device that performs an intercept point calibration using signal interferers is described. The signal interferers include at least self-generated signal interferers or opportunistic signal interferers in surrounding areas. Due to non-linearity in the transceiver device, intermodulation distortion (IMD) signal components are generated. Filtering of the IMD signal components is performed to allow low-frequency components, such as a second order intermodulation (IM2) to pass through. A dynamic minimization algorithm is performed to minimize distortion effects of the low-frequency components.06-23-2011
20110151794COMMUNICATION APPARATUS, METHOD OF CONTROLLING THE SAME, AND COMPUTER-READABLE MEDIUM - A communication apparatus according to the present invention includes a reservation unit configured to reserve a time frame to communicate with a communication partner, a determination unit configured to determine presence or absence of an interference with the communication partner in the communication with the communication partner using the time frame reserved by the reservation unit, and a masking unit configured to mask the time frame when the determination unit determines presence of the interference.06-23-2011
20110151793ADAPTIVE COLLISION AVOIDANCE APPARATUS AND METHOD IN CHANNEL-HOPPING BASED WIRELESS AD-HOC NETWORKS - There are provided an adaptive collision avoidance apparatus and a method in a channel-hopping based wireless AD-HOC networks. The adaptive collision avoidance apparatus is configured to include a channel quality measuring unit that measures the quality of each channel by using receiving frames; an unavailable channel classifying unit that classifies unavailable channels not to perform communications in the future based on information on the quality of each channel; an unavailable channel propagating unit that transfers a list of unavailable channels classified as unavailable channels to adjacent nodes; and a transceiver that transmits and receives frames through channels not classified as the unavailable channels.06-23-2011
20100304681NARROWBAND INTERFERENCE REJECTION FOR ULTRA-WIDEBAND SYSTEMS - A technique for reducing interference between a direct-sequence ultra-wideband communications system and a narrowband communications system uses interference-rejecting spreading codes to reduce signal power in a frequency band associated with the narrowband communications system. A method of operating an ultra-wideband communications system includes applying an interference-rejecting spreading code to a signal for transmission. The interference-rejecting spreading code is configured to reduce power in a particular frequency band of a transmit or receive power spectral density associated with the ultra-wideband signal without substantially reducing power outside that particular frequency band of the transmit or receive power spectral density associated with the ultra-wideband signal.12-02-2010
20100112952BASE STATION AND METHOD FOR IMPROVING COVERAGE IN A WIRELESS COMMUNICATION SYSTEM USING ANTENNA BEAM-JITTER AND CQI CORRECTION - A base station and method are described herein that improves the coverage in a fixed-beam wireless communication system by using antenna beam-jitter and Channel Quality Information (CQI) correction. In one embodiment, the method includes the steps of: (a) modifying a beam by introducing a beam-jitter in a beam-forming pattern; (b) receiving an estimated channel quality information, CQI, from a user terminal; (c) accounting for effects of the beam-jitter on the estimated CQI to obtain a jitter-adjusted CQI estimate; (d) and using the jitter-adjusted CQI estimate during user scheduling for a future transmission to the user terminal.05-06-2010
20080248753Method and apparatus for retransmitting data based on antenna scheduling in MIMO system - Provided is a method for retransmitting data based on antenna scheduling in a MIMO system to which a spatial multiplexing technique is applied. The method includes the steps of: (a) at a transmitter side, modulating an input packet into transmittable data to transmit to a receiver side; (b) at the receiver side, estimating channel values from the packet transmitted from the transmitter side, and selecting transmitting and receiving antennas for transmitting the next packet from the estimated channel values; (c) detecting whether an error is present in the packet or not, and transmitting a feedback signal to the transmitter side, the feedback signal including information on whether or not to transmit the packet and a list of the selected transmitting antennas; and (d) at the transmitter side, retransmitting the transmitted packet or transmitting the next packet through the transmitting antennas designated by the receiver side depending on the feedback signal.10-09-2008
20110212692Cascaded Filter Based Noise and Interference Canceller - Signals propagating from an aggressor communication channel can cause detrimental interference in a victim communication channel. A high input power cascaded filter canceller (“HIPCF”) can obtain a sample of the signal that imposes interference and process the sampled signal to generate an interference compensation signal that, when applied to the victim communication channel, cancels or suppresses the detrimental interference. The HIPCF canceller can include two or more cascaded filters, such as band-pass filters, that block or reduce amplitude of a signal outside the communication frequency band of a victim receiver. The HIPCF canceller also includes an I/Q modulator that receives the filtered signal and generates the interference compensation signal by adjusting or updating one or more aspects of the filtered signal, such as a gain, phase, or delay, based upon feedback from the victim receiver or a power detector and algorithms executed by the controller.09-01-2011
20100003920PEAK SUPPRESSING AND RESTORING METHOD, TRANSMITTER, RECEIVER, AND PEAK SUPPRESSING AND RESTORING SYSTEM - A peak suppressing and restoring method includes suppressing a peak of a signal, starting suppression when a suppression start value is lower than a suppression target value, using a function of a gain characteristic such that a peak amplitude value attains the suppression target value, and restoring the suppressed peak of the signal using an inverse function of the function of the gain characteristic.01-07-2010
20120202430HIGH DATA RATE AIRCRAFT TO GROUND COMMUNICATION ANTENNA SYSTEM - A method for ground to air communication includes receiving a first pilot signal on a first wide beam from a first ground base station by a first antenna element covering a first range of azimuth angles from an aircraft. Data is received on a directed data beam from the first ground base station by the first antenna element. A second pilot signal is received on a second wide beam from a second ground base station by a second antenna element covering a second range of azimuth angles different than the first range of azimuth angles. A signal strength of the second pilot signal is compared with a signal strength of the first pilot signal. Data reception is switched from the first antenna element to the second antenna element if the signal strength of the second pilot signal is greater than the signal strength of the first pilot signal.08-09-2012
20110256833INTERFERENCE-FREE NEIGHBOR CELL MEASUREMENTS - A device selects one or more cells in the network, and coordinates transmissions from the selected one or more cells, and transmissions from neighbor cells of the selected one or more cells, so that transmissions of the selected one or more cells do not interfere with reference signals transmitted by the neighbor cells at designated times. The device also receives, from a user equipment served by the selected one or more cells, measurement reports associated with the reference signals transmitted by the neighbor cells, and determines signal strengths of the neighbor cells based on the measurement reports. The device further determines, based on the signal strengths, whether network coverage is sufficient when coverage of the selected one or more cells is reduced or when the selected one or more cells are out of service.10-20-2011
20120064833WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION DEVICE - When applying inflated lattice precoding (ILP) transmission to a multi-carrier scheme, there arises a need to notify coefficient α thereof per sub-carrier. Applying ILP transmission has proven difficult since multi-carrier schemes such as those widely adopted in mobile communication systems, etc., in recent years have an extremely large number of sub-carriers and the information volume of the control signal becomes extremely large. As such, at a transmitter device B, coefficient α is inputted to a 1/α multiplier part 03-15-2012
20080214114INVERSION OF CHANNEL DISTORTION BY ADAPTIVE WAVELET LIFTING - A method for inverting telecommunication channel distortion by adaptive wavelet lifting. The distortion signal is analyzed using wavelet lifting and the inverse filter is computed. Coefficients of the inverse filter are used to either compute a transmission pre-filter or to update the transmitted message.09-04-2008
20110009065INTERFERENCE MITIGATION IN A FEMTOCELL ACCESS POINT - A base station in a cellular network, such as a femtocell access point, has a first coverage area, and is located in a second coverage area associated with a second base station. The base station operates to detect a possibility of interference based on estimated first path losses, between the base station and points in the first coverage area, and a second path loss, between the base station and a user equipment that is attached to the second base station. The second path loss may be estimated in the base station, although there is no connection between the base station and the user equipment attached to the second base station, by estimating the average transmit power of the user equipment that is attached to the second base station; detecting in the base station signals transmitted by the user equipment that is attached to the second base station; and estimating the second path loss from a difference between the estimated average transmit power and the power of the detected signals transmitted by the user equipment that is attached to the second base station.01-13-2011
20110009066METHOD AND APPARATUS FOR PROVIDING UPLINK SIGNAL-TO-NOISE RATIO (SNR) ESTIMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system. A first signal is received over a first channel and a second signal is received over a second channel, where the second signal is received at a higher signal power level than said first signal. A signal-to-noise ratio (SNR) of the second signal is measured, and the SNR of the first signal is determined based at least in part upon the measured SNR of the second signal.01-13-2011
20120122402Systems and Methods for Detection of Transmission Facilities - In embodiments, a method of detecting a transmitting device within an obstruction rich environment is disclosed. The method may involve detecting the transmitting device with a wireless transmission detection facility; communicating signal information relating to the detected transmitting device from the wireless transmission detection facility to a central unit; determining the location of the transmitting device; displaying information of the detection and location of the transmitting device through a user interface; and providing an action facility for causing actions related to the detected transmitting device.05-17-2012
20110053515SYSTEMS AND METHODS FOR SUPPRESSING RADIO INTERFERENCE FROM A NOISE SOURCE VIA ACTIVE FILTERING - Systems and methods are provided for suppressing radio interference from a noise source having an operating frequency. One system includes memory for storing a threshold signal strength, a re-configurable filter for selectively filtering signals of a harmonic of the operating frequency, and a controller. The controller is configured to compare a signal strength of a received signal to the threshold signal strength and turn ON the re-configurable filter if the signal strength of the received signal is less than or equal to the threshold signal strength. A method includes determining a noise signature for the motor vehicle and associating a signal strength threshold with the noise signature. The method further includes comparing a signal strength of a tuned radio station to the signal strength threshold and turning ON the filter if the signal strength is less than or equal to the signal strength threshold.03-03-2011
20110053514REJECTION OF A CLOSE-IN-FREQUENCY INTERFERER EMPLOYING A LOG DETECTOR AND CLASSICAL DOWN CONVERTER - Disclosed is a methodology and apparatus for rejecting a high-power, near-in-frequency, radio frequency interference. The subject rejection methodology provides two branches; one is a classical down converter branch, and the other is a log detector followed by a high pass filter. The two branches produce a complex multiplication which cancels the highest inter modulation product and the final output is presented at the originally intended intermediate frequency. The methodology is appropriate for a constant-amplitude modulation on the interferer and any combination of phase, frequency, and amplitude modulation on the intended signal.03-03-2011
20110053513METHODS AND APPARATUS TO IDENTIFY WIRELESS CARRIER PERFORMANCE EFFECTS - Example methods and apparatus to identify wireless carrier performance effects are disclosed. A disclosed example method includes receiving an indication of media content presentation on a wireless communication device, monitoring a wireless carrier operating parameter in response to receiving the indication of media content presentation, and monitoring the wireless communication device for a media content presentation command. The example method also includes associating the media content presentation command and the wireless carrier operating parameter with a scoring factor indicative of subscriber preferences, and generating a report including the scoring factor.03-03-2011
20100323623Method for Adapting the Signal Transmission between Two Electronic Devices, as well as Arrangement with a Computer System and a Peripheral Device - A method for adapting the signal transmission between two electronic devices (12-23-2010
20100323622INTERFERENCE CANCELLATION FOR PREDICTIVE SIGNALS - A method, apparatus, system, and computer program product example embodiments of the invention are disclosed to reduce interference of predictive signal transmissions between wireless devices. In an example embodiment, a wireless receiver is configured to receive a composite signal, wherein the composite signal includes at least a beacon component comprising a regular beacon symbol. The wireless receiver is configured to determine from the beacon component, a predicted reception of a predicted future beacon symbol, using a known beacon transmission pattern. The wireless receiver is configured to cancel from the composite signal a future received beacon symbol, based at least partly on the predicted future beacon symbol.12-23-2010
20100330917COMMUNICATION SYSTEM FOR DISTRIBUTEDLY MANAGING INTERFERENCE USING FEEDBACK MESSAGE - A method of operating a target terminal being serviced by a serving base station is provided. In a downlink case, the target terminal being served by the serving base station may provide a feedback message to a neighboring base station. The feedback message may be used by the neighboring base station to verify channel information between the serving base station and the target terminal, and channel information between the neighboring base station and the target terminal. In an uplink case, the neighboring base station may provide the feedback message to the target terminal. The target terminal may transfer, to the serving base station, channel information between the neighboring base station and a particular terminal, and channel information between the neighboring base station and the target terminal that are verified based on the feedback message. The feedback message may be transferred using a common shared channel or a random access channel.12-30-2010
20100330915METHODS AND APPARATUS FOR COMMUNICATING WITH MULTIPLE ANTENNAS - Wireless communications methods and apparatus for a device using multiple antennas are described. A first wireless communications device receives signals from a second communications device. The first device generates receiver interference estimates corresponding to different antennas and selects one antenna to receive signals from the second device, as a function of the generated receiver interference estimates. The first device receives signals from one or more additional devices to which first device transmission may cause interference. The first device generates transmitter interference estimates corresponding to different antennas and selects one antenna to transmit signals to the second device as a function of the generated transmitter interference estimates. The first device may, and sometimes does, select different receive and transmit antennas for communicating with the second device.12-30-2010
20100330916INTERFERENCE ELIMINATING CIRCUIT AND SIGNAL TRANSCEIVING SYSTEM EMPLOYING THE SAME - An interference eliminating circuit for removing an interference signal from a multi-carrier signal includes a training sequence generator, a first multiplier, a second multiplier, a phase shift circuit, a buffer, and an adder. The multi-carrier signal includes a first training sequence. The training sequence generator generates a second training sequence orthogonal to the first training sequence. The first multiplier attaches the second training sequence to the multi-carrier signal to obtain a new multi-carrier signal. The second multiplier attaches the second training sequence to the new multi-carrier signal to obtain the interference signal. The phase shift circuit shifts phase of the interference signal to obtain an adverse signal of the interference signal. The buffer buffers the multi-carrier signals. The adder adds the adverse signal of the interference signal to the buffered multi-carrier signals to remove the interference signal.12-30-2010
20110014874CONVOLUTIONAL IMPAIRMENT COVARIANCE ESTIMATION METHOD AND APPARATUS - Path delay information generated by a path searcher module of a wireless receiver is used to generate net channel coefficients for use in suppressing interference from a received signal. According to one embodiment, interference is suppressed from a signal transmitted over a communication channel including transmit and receive pulse shaping filters and a radio channel by generating net channel coefficients for the communication channel at processing delays such as G-Rake finger delays or chip equalizer tap delays. Medium channel coefficients are generated for the radio channel at estimated path delays as a function of the net channel coefficients. The net channel coefficients are regenerated at arbitrary delays as a function of the medium channel coefficients and an impairment covariance estimate is generated based at least in part on the regenerated net channel coefficients.01-20-2011
20110014875System and Method for Uplink Power Control in a Wireless Communications System - A system and method for uplink power control in a wireless communications system are provided. A method for power control of uplink transmissions by a communications device includes computing a power offset based on a signal target and a measured received signal power strength, generating a power control command from the power offset, and transmitting the power control command to the communications device. The signal target is based on control information provided by the communications device.01-20-2011
20100173589METHOD AND APPARATUS OF IMPROVING CAPACITY OF CHANNEL - A method and apparatus of improving capacity of channel is disclosed. A vector X(t) is generated based on a cycle period 1/T of a wide-sense cyclo-stationary (WSCS) noise and a whitening filter W(t) for decorrelating the WSCS noise in frequency domain. A scalar signal X(t) is generated by shifting the vector X(t) in the frequency domain.07-08-2010
20110151791Apparatus And Method For Maintaining Communication With A Stolen Vehicle Tracking Device - Communications are maintained between a base station and a stolen vehicle tracking (SVT) module disposed with a vehicle. At the SVT module at the vehicle, it is determined whether jamming is occurring with communications between the SVT module and the base station and a temperature is measured at the SVT module. When jamming is detected, an adjustment is determined for a frequency of an oscillator of the SVT module and the adjustment is based at least in part upon the temperature. The frequency of operation of an oscillator is adjusted according to the adjustment. A message is transmitted to the base station according to the adjusted frequency.06-23-2011
20110151790WIRELESS COMMUNICATION CHANNEL BLANKING - Systems and methodologies are described that facilitate blanking on portions of bandwidth, such as a subset of interlaces, utilized by communicating devices that are dominantly interfered by a disparate device in wireless communications networks. The portions of bandwidth can relate to critical data, such as control data, and one or more of the communicating devices can request that the dominantly interfering device blank on one or more of the portions. The communicating devices can subsequently transmit data over the blanked portions free of the dominant interference. Additionally, the dominantly interfering device can request reciprocal blanking from the one or more communicating devices.06-23-2011
20110136438METHOD AND APPARATUS FOR MAINTAINING TRANSMIT AUDIO IN A HALF DUPLEX SYSTEM - A method for maintaining transmit audio quality under harsh environmental conditions, the method includes receiving audio signals into a microphone of a portable communication device and determining at least one parameter associated with the received audio signals. In accordance with an embodiment, the at least one parameter is compared with a received audio parameter threshold. When the at least one parameter falls outside of the received audio parameter threshold, the audio routing is switched from the microphone to the loudspeaker. Subsequent communication may revert back to the microphone or remain at the loudspeaker depending on monitored audio conditions.06-09-2011
20090176454Methods and apparatus for wireless device coexistence - Methods and apparatus for compensating for the effects of interference between multiple wireless communication apparatus. In one embodiment, the method comprises providing a first wireless communication apparatus operating in a first band and a second wireless communication apparatus operating at least partly in the first band, where the second wireless communication apparatus operates according to a different communication protocol than the first wireless communication apparatus. Interference is compensated for between the first wireless communication apparatus and the second wireless communication apparatus by selecting and operating according to one of a plurality of operational protocols. In another embodiment, the first wireless communication apparatus and the second wireless communication apparatus operate in a closed-loop relationship to cooperatively compensate for communication interference.07-09-2009
20090197538INTERFERENCE REDUCTION REQUEST IN A WIRELESS COMMUNICATION SYSTEM - Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a first station (e.g., a base station or a terminal) may send a first message to at least one interfering station to request reduction of interference on at least one resource. The first station may send the first message in anticipation of receiving data on the at least one resource. An interfering station may receive the first message from the first station and may reduce interference on the at least one resource by reducing its transmit power and/or by steering its power in a direction different from the first station. The first station may thereafter receive data from a second station on the at least one resource. The techniques may be used for data transmission on the forward and reverse links.08-06-2009
20090197536Improvements relating to data transfer apparatus - A data movement controller (08-06-2009
20100190447DOWNLINK INTERFERENCE CANCELLATION METHODS - A method to mitigate interference in a wireless system is provided. The method includes processing a set of radio network identifiers and limiting a number of hypotheses associated with the radio network identifiers in order to mitigate interference in a wireless network. In another aspect, the method includes processing a set of hypotheses and limiting the set of hypotheses by limiting a number of downlink grants to a common space, limiting the number of downlink grants to a number of instances, or limiting the number of grants to a physical downlink control channel (PDCCH) type. In yet another aspect, the method includes processing a downlink set and generating a target termination level for the downlink data set, the termination level associated with a Hybrid automatic repeat-request.07-29-2010
20110189959REDUCTION METHOD AND APPARATUS - The present invention relates to a tilt correction method and a corresponding apparatus for correcting tilt of RF signals in a wanted channel having a predetermined frequency range, in a signal path of a communication equipment, wherein the RF signals are down-converted to an intermediate frequency of an IF domain. The method comprises the steps of: providing a predetermined RF signal having a particular frequency to the signal path, detecting an output signal in the intermediate frequency (IF) domain and outputting a detection result, repeating the providing step and the detecting step for plural RF signals of different frequencies within the channel frequency range, determining the tilt of the RF signals in the frequency range by comparing the detection results, and correcting the tilt to obtain a minimized tilt of the wanted channel depending upon the determined tilt. The present invention further refers to a computer program including program code means to carry out the method, and to an integrated circuit wherein the apparatus is implemented.08-04-2011
20100029211DYNAMIC IoT SETPOINTS AND INTERFERENCE CONTROL - Reverse link interference can be controlled by utilizing a dynamic and changeable IoT setpoint, which is a quantitative measurement of total interference received at a base station. The interference can occur when a mobile device in an adjacent sector is communicating over the reverse link. The IoT setpoint can be changed based on conditions occurring in the sector and/or scheduling information for the future. A fast up indicator (Up+) can be transmitted for reverse link interference, which allows the receiving device to take advantage of the fact that additional interference created will not affect the sector. An interference control action can be transmitted in an Other Sector Interference Bit (OSIB) channel over the air or over the backhaul. The interference control action can be determined as a function of the dynamic IoT setpoint.02-04-2010
20100029214PORTABLE AUDIO DEVICE HAVING REDUCED SENSITIVITY TO RF INTERFERENCE AND RELATED METHODS - A portable audio device having reduced sensitivity to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device may include a portable housing, a battery carried thereby, a recharging power input connected to the battery, a digital signal input, and an audio analog signal output. A digital-to-analog converter (DAC) may be carried by the portable housing and powered by the battery for converting a selected digital audio file from a memory into an analog audio signal. An audio analog amplifier may be connected between the DAC and the audio analog signal output. A first RF filter(s) may be connected to the recharging power input, and a second RF filter(s) may be connected to the audio analog signal output, both for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.02-04-2010
20080268783CHANNEL ESTIMATOR AND METHOD FOR CHANGING IIR FILTER COEFFICIENT DEPENDING ON MOVING SPEED OF MOBILE COMMUNICATION TERMINAL - Disclosed is a channel estimator and a method for changing a coefficient of an IIR filter depending on a moving speed of a mobile communication terminal. In the channel estimator, a coefficient changing unit receives I and Q signals from a current base station, and selects a coefficient of the IIR filter optimized depending on the moving speed of the current mobile communication terminal. The coefficient changing unit sets the selected coefficient of the IIR filter to the IIR filter of the channel estimator. Accordingly, it is possible to prevent the performance degradation of the channel estimator caused by the speed of the mobile communication terminal.10-30-2008
20100009634INTER-CELL INTERFERENCE CANCELLATION FRAMEWORK - Communication techniques enable efficient communication to an UE (User Equipment) that is subject to a dominant interference signal that is transmitted by a different base station. Disclosed interference cancellation techniques, both UE-centric and network-centric, are suitable to this situation. These techniques are particularly advantageous when undesirable or difficult to introduce changes in the physical (PHY) and medium access control (MAC) layers at the existing base stations. UE-centric framework refers to an approach largely implemented by UEs to include pico or femto cells. Network-centric framework closed-loop coordination between base stations and UEs mitigate interference thereby improving network performance. In particular, an interfering base-station can help a “victim” UE by adjusting downlink pilot and control power and to adjust traffic data rates responsive to information that the “victim” UEs provide, including information about the interfering link and performance of the cancellation itself sent over the air or using the backhaul.01-14-2010
20100069010Distributed multi-cell successive interference cancellation for uplink cellular networks - Example embodiments are directed to methods of reducing inter-cell interference in wireless networks using successive interference cancellation (SIC). Example embodiments use inter-cell cooperation between cells and/or sectors to successfully decode their associated users' data signals and pass on the decoded data signals to other cells/sectors in order to reduce inter-cell interference and allow for improved decoding of users' data signals. Example embodiments include passing the decoded data signals via the backhaul. Example embodiments also include static and dynamic ordering of user data signals in conjunction with the application of SIC.03-18-2010
20110306302RECEPTION APPARATUS AND RECEPTION METHOD - A reception apparatus and a reception method improving the effect of interference suppression and reducing interference to the side subject to interference. A satellite signal demodulation unit (12-15-2011
20090081955METHOD FOR REDUCING INTERFERENCE IN A CELLULAR RADIO COMMUNICATION NETWORK, CORRESPONDING INTERFERENCE COORDINATOR AND BASE STATION - The present invention relates to a method for reducing interference in a cellular radio communication network, said network comprising a plurality of base stations and a plurality of terminals to be scheduled on frequency and/or time resources.03-26-2009
20100297949RADIO TRANSMISSION DEVICE, METHOD FOR DETERMINING MODULATION SYSTEM, AND RECORDING MEDIUM THEREFOR - A problem that a loss of signal occurs due to switching of a modulation scheme using an adaptive modulation scheme is solved. A radio transmission device (11-25-2010
20100311343HIERARCHICAL MODULATION FOR ACCURATE CHANNEL SOUNDING - Method and apparatus for improving the channel estimate of a communication channel between a first station and a second station, while reducing the amount of reserved bandwidth for pilot tones. Hierarchical modulation is used to augment pilot density without sacrificing throughput. At the first station, a digital information stream may be split into a base stream and an enhancement stream, wherein the base stream and the enhancement stream combined form a hierarchical signal. At the second station, the base stream may be first recovered, and recovered base stream serves as a pilot for the enhancement stream. Thus the base stream, which is a subset of the total transmitted information, may be made to perform the channel-sounding function for the enhancement stream.12-09-2010
20110111701APPARATUS AND METHOD FOR AVOIDING CHANNEL INTERFERENCE IN A SINGLE CHANNEL SENSOR NETWORK - A method of avoiding a channel interference in a single channel sensor network, includes periodically measuring an energy of a channel used by at least one node included in the sensor network; exchanging the measured energy of the channel with a neighbor node of the at least one node; receiving energy of all nodes of the sensor network and determining if there is an interference, by a coordinator node, which is a highest node of the at least one node; and when it is determined that there is an interference, switching a channel influenced by the interference to a channel which has been scanned by the coordinator node and is not influenced by the interference, thereby avoiding an influence of the interference.05-12-2011
20100029212Inter-cell power control for interference management - A system and method for inter-cell power control for interference management in an OFDM system is provided. The system provides for a combination use of open loop and closed loop PSD control algorithms. The open loop control is a function of path loss from the serving cell as well as the neighboring cells. The closed loop control updates the end node transmit PSD by listening to the load indicators from the serving cell and at least one other neighboring non-serving cell which generates the highest level of interference. The system thus provides a fast and tight control with multi-cell information that allows improved inter-cell interference control.02-04-2010
20120040619Macro User Equipment Initiated Evolved Inter-Cell Interference Coordination Mechanism Through Private Femtocells - In one embodiment, a wireless base station, receives a random access preamble from a wireless device that is not authorized to utilize the wireless base station, the random access preamble indicating that the wireless device suffers interference from the wireless base station. The wireless base station sends a random access response to the wireless device; receives an interference stress message from the wireless device; and reduces interference for the wireless device.02-16-2012
20100056057UPLINK INTERFERENCE CONTROL IN A WIMAX COMMUNICATION SYSTEM - An apparatus and method to provide uplink interference control in a WiMAX communication system includes a step 03-04-2010
20090068952PROCESS FOR ELIMINATING INTERFERENCES IN A HSDPA MOBILE TERMINAL - Process of elimination of interferences in a downlink transmission channel between a mobile terminal comprising the resources to receive HSDFA and MBMS service and a base station of a cellular telecommunications network.03-12-2009
20110065390POLARIZATION CO-ORDINATION - The present invention relates to a group (G03-17-2011
20110319026WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM - By switching to a method that allocates frequency diversity as an independent signal sequence during the time when an influence of fading is small, adaptively corresponding to an increase and decrease of fading, performs stable wireless communication, and frequency resources are effectively utilized. A wireless communication system selects and performs quadruple diversity which is composed of space diversity using two uncorrelated antennas and frequency diversity using two waves of frequencies f12-29-2011
20110319025Reference Signal Interference Management in Heterogeneous Network Deployments - Methods and apparatus for enabling interference coordination in a communication network. A base station includes a plurality of antenna ports. Each antenna port is configured to transmit a reference signal, and each antenna port is associated with a respective cell. The base station determines a set of cells where transmissions of reference signals is to be performed from a reduced set of the plurality of antenna ports. The base station determines a subset of antenna ports in at least one cell of the determined set of cells to enable interference coordination in the network, and transmits the reference signal from the subset of antenna ports.12-29-2011
20120252366WIRELESS SIGNAL PROCESSOR AND WIRELESS APPARATUS - One embodiment provides a signal processor configured to cooperate with a first apparatus having first and second antennas and a second apparatus having third and fourth antennas, including: first and second calculators for calculating first and second coefficient, respectively; first and second estimators for estimating first and second transfer functions of a path between the first and second apparatuses based on first and second weights; and a third calculator for calculating a third coefficient. The third coefficient is used with the first and second transfer functions for making a transfer function ratio regarding the first antenna, a transfer function ratio regarding the second antenna, a transfer function ratio regarding the third antenna and a fourth transfer function ratio regarding the fourth antenna same as one another.10-04-2012
20120045996COMMUNICATION SYSTEM AND METHOD - A communication system including a first station having at least two first narrow beam antennas and a second station having at least two second narrow beam antennas. The first and second stations establish a first communication path for wireless communication via a pair of first and second narrow beam antennas. When communication via the first communication path is disturbed by obstacles, the first and second stations automatically establish at least one alternative communication path, which is spatially different from the first communication path, for wireless communication using the at least two first narrow beam antennas and the at least two second narrow beam antennas.02-23-2012
20120045995INTERFERENCE SUPPRESSION WIRELESS COMMUNICATION SYSTEM AND INTERFERENCE SUPPRESSION WIRELESS COMMUNICATION DEVICE - An interference suppression wireless communication device to be used in an interference suppression wireless communication system, includes: a variance acquirer configured to acquire a variance of channel estimation errors associated with a channel for a transmission signal of the interference suppression wireless communication device, a variance of channel estimation errors associated with a channel for an interference signal, and a variance of noise included in the transmission signal when the transmission signal is received; and a coefficient calculator configured to calculate, based on the variances acquired by the variance acquirer, a coefficient by which the interference signal to be subtracted from the transmission signal is multiplied.02-23-2012
20120003938DYNAMIC SIGNAL DETECTION THRESHOLD - A method for setting a signal detection threshold according to one embodiment includes determining a measure of a noise floor in a signal derived from a radio frequency signal received by an antenna using a same circuit used to detect a subcarrier signal during transmitting and prior to sending a command to a transponder to respond; and setting a signal detection threshold above the noise floor. Such methodology may also be implemented as a system using logic for performing the various operations. Additional systems and methods are also presented.01-05-2012
20120015608METHOD IN A WIRELESS REPEATER EMPLOYING AN ANTENNA ARRAY FOR INTERFERENCE REDUCTION - A wireless repeater with an antenna array determines the antenna weights to modify the spatial selectivity of the antenna array to reduce interference and improve the quality of signal reception. The antenna weights are determined using an error minimizing algorithm to minimize the error between a desired receive signal and a reference signal or an adaptive metric optimization algorithm to calculate adaptively antenna weights to minimize the signal-to-noise ratio of a desired receive signal.01-19-2012
20110165844COMMUNICATIONS SYSTEMS MANAGEMENT USING MM-WAVE BASED MOTION SENSING - Two or more transceiver units can interact with each other via millimeter wave radio frequency signals. One of the transceiver units can detect time-varying signals having specific waveforms in order to initiate an action such as establishment of a communication link, powering a piece of equipment and the like. The time-varying signal can be generated by a user moving one of the transceiver units and/or by passing an non-transmissive obstruction in between the transceiver units. Related apparatus, systems, and methods are also disclosed.07-07-2011
20120129456Systems and Methods for Silencing Wireless Devices - Embodiments provide systems and methods to optimize the time when to receive transmissions from dissimilar wireless networks, and hence, improve the overall network throughput and avoid access point transmission rate fall-back mechanism having an avalanche effect during coexistence of dissimilar wireless network technologies. A receiver comprises at least two dissimilar network technology subsystems and is able to receive transmissions from dissimilar wireless network technology subsystems during a predetermined reception window.05-24-2012
20100167654APPARATUS AND METHOD OF DETERMINING MODIFICATION OF WIRELESS SERVICE USE FOR SPECTRUM LIBERALIZATION - An apparatus and method of determining a modification of a wireless service use for spectrum liberalization is provided. When a licensee using a wireless service in a particular band desires to modify the wireless service use, the method of determining a modification of a wireless service use for spectrum liberalization may determine whether to modify the wireless service use through a worst-case interference check scheme and a Monte-Carlo interference check scheme.07-01-2010
20120058730MODULATION SWITCHING METHOD, TRANSMISSION STATION, AND RECEIVING STATION - A modulation switching method performed in a radio communication system is disclosed. In the method, difference information between the first channel quality information fed back from the receiving station and second channel quality information used to determine a modulation method is generated and is sent as control information is sent to the receiving station, with the transmission station. Switch information from the difference information received as the control information and third channel quality information being previous information in the receiving station are acquired, and data signal is demodulated based on the switch information, with the receiving station.03-08-2012
20120058732METHOD AND DEVICE FOR DETERMINING CHANNEL FEEDBACK INFORMATION IN LTE SYSTEM - A method and a device for determining channel feedback information in a Long Term Evolution (LTE) system are provided. The method includes: obtaining an (N-1)03-08-2012
20120058729Apparatus and Method of Generating Quiet Zone by Cancellation-Through-Injection Techniques - A quiet zone generation technique is proposed for interference mitigation for a receive antenna by injecting the very interference signals via iterative processing, generating quiet zones dynamically for receive (RCV) antennas. The receive antenna may feature multiple receiving apertures distributed over a finite area. Optimization loops consist of four cascaded functional blocks; (1) a pick-up array to obtain the interference signals, (2) element weighting and/or repositioning processors, (3) an auxiliary transmit (XMIT) array with optimized element positions, (4) a diagnostic network with strategically located probes, and (5) an optimization processor with cost minimization algorithms.03-08-2012
20120058731Method and Apparatus for Co-Location of Two Radio Frequency Devices - A method for avoiding signal interference between a first RF device and a second RF device is provided. The first and second RF devices are co-located and the first RF device is configured to operate in a first frequency range. The second RF device is configured to operate in a second frequency range, where the first frequency range overlaps, at least in part, the first frequency range. The method initiates with a communication interface being provided between the first RF device and the second RF device. Then, the second RF device is configured to avoid RF signal collisions with the first RF device when the first RF device is active. An apparatus where two RF devices are co-located without causing interference for each other is also provided.03-08-2012
20120071104TRANSMITTER DEVICE, RECEIVER DEVICE, AND WIRELESS COMMUNICATION SYSTEM - With respect to a wireless communication system comprising a transmitter device 03-22-2012
20120071102MULTIPLE-INPUT, MULTIPLE-OUTPUT COGNITIVE RADIO - A wireless communication system and constituent wireless communication devices are provided to implement a distributed, cognitive radio approach to spectrum sharing. Under the distributed approach, individual wireless communication devices self-enforce negotiated agreements on usage of an available spectrum without intervention from a centralized authority. Particularly, individual wireless communication devices are configured to enhance information rates of their respective transmissions under predetermined constraints. The predetermined constraints can include transmit power constraints (e.g., a maximum power available to the wireless communication devices), or interference constraints (e.g., constraints on the amount, direction, and/or quality of interference generated by transmissions).03-22-2012
20120156999WIRELESS COMMUNICATION SYSTEM - A wireless communication terminal measures the reception status of a downlink signal sent from a wireless base station according to a periodic ranging process, and notifies the measured reception status of the downlink signal to the wireless base station. The wireless base station measures the reception status of an uplink signal sent from the wireless communication terminal according to the periodic ranging process, and performs a control process for avoiding interference with a wireless signal between the wireless base station and the wireless communication terminal based on the measured reception status of the uplink signal and the measured reception status of the downlink signal which is notified from the wireless communication terminal.06-21-2012
20120071101METHODS AND APPARATUS FOR REDUCING INTERFERENCE - A method and apparatus for reducing interference is provided. The method may include receiving an interference indicator from a station (STA), and determining a service period end time from the interference indicator. The method may further include terminating the service period at or before the service period end time, or determining an end to the service period at the service period end time, wherein the interference indicator comprises a time indication for the service period end time or a schedule of one or more start times of interference at the STA.03-22-2012
20090318087Method and Device for Preventing Interference at a Radio Receiver Device Caused by Several Radio Transmitter Devices - The present invention provides a method for reducing interference at a radio receiver device caused by several radio transmitter devices, comprising the steps of detecting simultaneous operation of at least two radio transmitter devices and a radio receiver device, determining that said simultaneous operation of said transmitter devices causes interference through frequency intermodulation effects at said radio receiver device, and controlling at least one of said radio transmitter devices and/or said radio receiver device, in order to reduce said interference.12-24-2009
20110092162Interferer Reduction - The invention is directed to a method for reducing the influence of an interfering signal S04-21-2011
20110105040FREQUENCY DIVISION MULTIPLE ACCESS COMMUNICATIONS WITHIN A DEVICE - A radio transceiver device includes circuitry for radiating electromagnetic signals at a very high radio frequency both through space, as well as through wave guides that are formed within a substrate material. In one embodiment, the substrate comprises a dielectric substrate formed within a board, for example, a printed circuit board. In another embodiment of the invention, the wave guide is formed within a die of an integrated circuit radio transceiver. A plurality of transceivers with different functionality is defined. Substrate transceivers are operable to transmit through the wave guides, while local transceivers are operable to produce very short range wireless transmissions through space. A third and final transceiver is a typical wireless transceiver for communication with remote (non-local to the device) transceivers.05-05-2011
20110105039Successive interference cancellation in code division multiple access system using variable interferer weights - A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be cancelled in order to recover a transmitted data signal. This method involves receiving the data signal subject to interference from at least one interfering signal. A first interfering signal is identified. Then an interferer weight coefficient associated with the first interfering signal is generated. This allows the first interfering signal to be cancelled from the received data signal using the interferer weight coefficient. These processes may then be reiterated for other interfering signals. It is then possible to recover the transmitted data signal from the received data signal.05-05-2011
20110105038ANTENNA SWITCHING METHOD OF WIRELESS COMMUNICATION SYSTEM - An antenna switching method of a wireless communication system capable of efficiently transmitting various signals from a plurality of transmitting antennas to a receiving unit is provided. The method includes a received signal intensity measuring step of operating an antenna switch (05-05-2011
20110105037METHODS AND SYSTEMS FOR INTERFERENCE CANCELLATION IN MULTI-MODE COEXISTENCE MODEMS - Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.05-05-2011
20110105036METHOD AND APPARATUS FOR SENSING PRESENCE OF AN INCUMBENT SIGNAL ON A SECONDARY RADIO CHANNEL - A remote station communicates with a base station over a secondary radio channel. During communication, the remote station determines channel conditions of the secondary radio channel. Based on the channel conditions, the remote station selects one or more sensing methods to be performed on the secondary radio channel. The result of performing the sensing method is used to determining whether an incumbent signal is present on the secondary radio channel.05-05-2011
20110105034Active voice cancellation system - The present invention relates to a speech cancellation system for actively reducing the audibility to nearby persons of the voice of the user into a personal communication device. This active noise cancellation system is comprised of a primary sound detection element to transform the original speech signal into electrical form and to transform the electrical speech signal into an electrical form from which the original sound could be reproduced and to organize it into digital sequences; a digital memory to store the digitized speech signal; a digital processor to change the polarity of the digital speech signal into its inverse; a further digital processor to insert a variable time delay between the inverted digital signal and the original digital signal; a digital to analog converter transform the inverted and delayed signal into analog form; a variable attenuator to alter the intensity of the inverted and delayed signal; a means to convert the inverted, delayed and attenuated signal into sound waves, such as a secondary electro-acoustic transducer; and a secondary acoustic-to-electric transducer to convert the attenuated delayed inverted signal plus the original speech signal into electrical form. The signal from the secondary acoustic-to-electric transducer is fed back to the attenuator and the delay devices in such a way that they are both independently altered by negative feedback so as to reduce the signal strength and altering the time delay so as to reduce the sound level of the sound field immediately surrounding the user of the personal communication device.05-05-2011
20110105033Methods for assigning scrambling codes and reducing interference in telecommunications networks - Example methods use secondary scrambling codes in telecommunications networks. The secondary scrambling codes are assigned to mobile stations and channels used by mobile stations that are not adversely affected by the use of secondary scrambling codes. By assigning secondary scrambling codes additional users can utilize telecommunications networks with unique scrambling codes without reducing quality of service or increasing resource consumption. Example methods also reduce interference between mobile stations in the telecommunications networks.05-05-2011
20110105035Reducing Multipath Signal Degradation Effects in a Wireless Transmission System - A transmitter transmits a signal to a receiver along a transmission path. The respective positions of the transmitter and the receiver are determined, and notice is received that a moving vehicle is proximate to the transmission path. Responsive to such notice, the moving vehicle position is determined, and such position is used with the transmitter and receiver positions to determine whether the moving vehicle is located between the transmitter and receiver positions. If so, the moving vehicle position is used to calculate the time delay between the times at which first and second components of the transmitted signal are received at the receiver, wherein the first component is transmitted directly to the receiver, and the second component is transmitted to the receiver after reflection from the moving vehicle. The calculated time delay is then used to provide a corrective signal component, which is employed to reduce degradation of the first component caused by the second signal component.05-05-2011
20090130981Radio-frequency communication device - There is provided a radio-frequency communication device that can sufficiently eliminate a leakage signal from a transmission side included in a received signal. The communication device includes a cancel amplitude controlling unit 05-21-2009
20090130980PERSISTENT INTERFERENCE MITIGATION IN A WIRELESS COMMUNICATION SYSTEM - Techniques for transmitting data with persistent interference mitigation in a wireless communication system are described. A station (e.g., a base station or a terminal) may observe high interference and may send a request to reduce interference to interfering stations. The request may be valid for a time period covering multiple response periods. Each interfering station may grant or dismiss the request in each response period, may dismiss the request by transmitting at full power, and may grant the request by transmitting at lower than full power. The station may receive a response from each interfering station indicating grant or dismissal of the request by that interfering station in each response period. The station may estimate SINR based on the response received from each interfering station and may exchange data with another station based on the estimated SINR. Persistent interference mitigation may reduce signaling overhead and improve resource utilization and performance.05-21-2009
20090130979WIRELESS COMMUNICATION CHANNEL BLANKING - Systems and methodologies are described that facilitate blanking on portions of bandwidth utilized by communicating devices that are dominantly interfered by a disparate device in wireless communications networks. The portions of bandwidth can relate to critical data, such as control data, and one or more of the communicating devices can request that the dominantly interfering device blank on one or more of the portions. The communicating devices can subsequently transmit data over the blanked portions free of the dominant interference. Additionally, the dominantly interfering device can request reciprocal blanking from the one or more communicating devices.05-21-2009
20110183623Methods For Reducing Interference In A Communication System - Example embodiments are directed to methods of reducing interference in a communication system. In at least one example embodiment, a method includes first determining, by a first transmitter having a multi-directional antenna configured to produce a plurality of beams, at least one interference level of at least one interfering beam of a plurality of beams of at least one transmitter in the communication system, second determining a transmitting beam pattern based on the interference level, the transmitting beam pattern indicating a sequence of illuminating the plurality of beams at corresponding time slots, third determining a fractional frequency reuse pattern based on the transmitting beam pattern, and transmitting data based on the transmitting beam pattern and the frequency reuse pattern.07-28-2011
20110183622CHIRP FOURIER TRANSFORM METHOD AND APPARATUS FOR CANCELING WIDE BAND INTERFERENCE - A wide band frequency domain canceller is used in cosite mitigation interference in which a signal tapped from a transmit antenna is coupled to a Chirp Fourier Transform to covert the signal into the frequency domain. The frequency domain signal is vector multiplied with a path transform function to add the path transfer function values to the sampled signal, after which the processed frequency domain signal is converted back into the time domain by an Inverse Chirp Fourier Transform, after which it is inverted and coupled into the receive path of a cosited receiver.07-28-2011
20120164950Cognitive Radio Transmission - A method, an apparatus, and a computer program for performing cognitive communications in a radio environment are presented. First, a radio communication device estimates a time-varying interference environment in a radio communication channel. On the basis of the estimation, a future interference environment is predicted from time-varying characteristics of the estimated interference. Upon predicting the future interference environment, a radio transmitter is configured to apply transmission parameters to be used in a future transmission time instant for which the interference environment has been predicted. As a consequence, the transmission parameters are selected proactively to match with the predicted interference environment. The transmission parameters may be configured as time-variant.06-28-2012
20120164949METHOD FOR CONTROLLING INTERFACE BETWEEN ADJACENT CELLS IN CELLULAR SYSTEM - A method of transmitting data from a terminal in a cellular system is provided. The data transmission method includes: calculating the transmission capacity of a predetermined number of vectors among pairs of orthogonal vectors; selecting the vector having the largest transmission capacity as a reference vector among the predetermined number of vectors; and transmitting data to a base station using the reference vector.06-28-2012
20100190448Compensation circuit and test apparatus - Provided is a correction circuit for generating an output signal emphasizing a predetermined signal component of a supplied input signal, including: a first detection section that detects a waveform of the input signal; an amplifying section that amplifies the waveform detected by the first detection section; a correction signal generating section that generates a correction signal by extracting an alternate current component from the waveform amplified by the amplifying section; and an output signal generating section that superimposes the correction signal on the waveform of the input signal, thereby generating the output signal. The first detection section detects the waveform of the input signal and an inverted waveform thereof, the amplifying section amplifies the waveform and the inverted waveform of the input signal, the correction signal generating section generates a correction signal and an inverted correction signal by extracting an alternate current component respectively of the waveform and the inverted waveform of the input signal amplified by the amplifying section, and the output signal generating section generates a pair of differential signals for the output signal, by superimposing the correction signal on the waveform of the input signal and superimposing the inverted correction signal on the inverted waveform of the input signal.07-29-2010
20100173590METHOD AND SYSTEM FOR ANTENNA SELECTION DIVERSITY WITH BIASING - Methods and systems for choosing at least one signal path are disclosed. Aspects of the method may include determining a signal quality metric for each of a plurality of signal paths, modifying the signal quality metric for each of the plurality of signal paths, and selecting at least one signal path based on at least one modified signal quality metric. At least one of the signal paths may be cycled through and the signal quality metric may be biased and/or increased and/or decreased for each of the plurality of signal paths by a fixed amount and/or by a predetermined amount. The signal quality metric may also be dynamically changed for each of the plurality of signal paths.07-08-2010
20100173588Method and apparatus for suppressing radio frequency interference from bluetooth wireless communication channels - A method and apparatus whereby RF (radio frequency) interference in a Bluetooth wireless communications link is suppressed using an enhancement to the Bluetooth protocol which operates to eliminate noise that is induced on the RF path by external electronic interference. The sampling rate at a Bluetooth transmitter is doubled, and samples are transmitted alternately with and without audio data (e.g., the microphone input data for a Bluetooth headset in transmit mode, or the speaker output data for a Bluetooth mobile phone in transmit mode) included therein. At the Bluetooth receiver, received samples which have been transmitted without audio data are subtracted from (i.e., inverted and digitally added to) corresponding ones of the received samples which have been transmitted with audio data, and the receiver then advantageously uses (only) the (modified) samples resultant therefrom, thereby removing the interference from the signal without reducing the effective sampling rate.07-08-2010
20100048137ECHO CANCELLER AND ECHO CANCELLATION METHOD - An echo canceller and an echo cancellation method are provided. In the echo cancellation method, a transmitting data sequence is received, and M taps are provided accordingly. In addition, the M taps are received, and N taps are output according to an echo distribution information, in which the M and N are natural numbers, and M>N. Besides, the N taps are multiplied by N tap coefficients respectively to generate N products. Further, the N products are summed up to generate an echo cancellation signal. Thereby, the cost of the echo cancellation is decreased.02-25-2010
20100279618Approach For Selecting Communications Channels In Communication Systems To Avoid Interference - An approach for selecting communications channels to be used by a communication system includes evaluating for the presence of one or more signals both a particular communications channel currently being used by the communication system and one or more other communications channels. For the particular communications channel currently being used by the communication system, signals that use a different communications protocol than the communication system are evaluated. For the one or more other communications channels, both signals that use the same communications protocol as the communication system and signals that use a different communications protocol than the communication system are evaluated. The approach may include the use of metrics and classification of device types to determine one or more communications channels to be used by the communication system.11-04-2010
20100279617Methods and Apparatus for Reducing Receive Band Noise in Communications Transceivers - A transceiver adapted to reduce receive band noise includes a transmitter, a receiver, a duplexer coupled between the transmitter and receiver, and a baseband circuit configured in a feed-forward path between a baseband section of the transmitter and a baseband section of the receiver. The baseband circuit is configured to generate an error signal representing errors generated in the baseband section of the transmitter and feed forward the error signal to an insertion point in the baseband section of the receiver. The insertion point is configured to combine the error signal generated by the baseband circuit with a received signal containing receive band noise leaked from the transmitter to the receiver via a transmit signal leakage path in the duplexer. The error signal and received signal are combined to reduce the receive band noise in the received signal.11-04-2010
20120178373ASYMMETRICAL MULTICARRIER INTERFERENCE AVOIDANCE - A system and methods for asymmetrical multicarrier interference avoidance in a communication from a network to a subscriber device. The asymmetrical multicarrier interference avoidance technique comprises measuring signal-to-noise ratio interference values and sorting the measured values into two tables for selecting an anchor and a non-anchor frequency carrier pairs. The system is self-tuning based on changes in the network, the subscriber and the surrounding environment.07-12-2012
20100273427METHOD AND APPARATUS FOR FILTERING NOISY ESTIMATES TO REDUCE ESTIMATION ERRORS - Techniques for filtering noisy estimates to reduce estimation errors are described. A sequence of input values (e.g., for an initial channel impulse response estimate (CIRE)) is filtered with an infinite impulse response (IIR) filter having at least one coefficient to obtain a sequence of output values (e.g., for a filtered CIRE). The coefficient(s) are updated based on the sequence of input values with an adaptive filter, a bank of prediction filters, or a normalized variation technique. To update the coefficient(s) with the adaptive filter, a sequence of predicted values is derived based on the sequence of input values. Prediction errors between the sequence of predicted values and the sequence of input values are determined and filtered to obtain filtered prediction errors. The coefficient(s) of the IIR filter are then updated based on the prediction errors and the filtered prediction errors.10-28-2010
20100273426METHOD AND SYSTEM FOR DYNAMIC SELECTION OF A COEXISTENCE METHOD AND TRANSMIT POWER LEVEL BASED ON CALIBRATION DATA - Aspects of the invention may comprise calibrating operations of wireless transmitters and/or receivers in a communication device to mitigate interference caused during concurrent communications via the wireless interfaces in the communication device. Calibration may be performed dynamically, and may comprise managing system parameters and/or physical resources of the communication device and/or the wireless transmitters and/or receivers; managing characteristics of wireless communication performed via the wireless transmitters and/or receivers; and/or managing isolation between two or more of said plurality of wireless transmitters and/or receivers in said communication device. The calibration may be performed based on data generated, via the wireless transmitters and/or receivers, during active and/or idle phases of operations. The data may be based on monitoring of RF effects caused by operations of other wireless transmitters and/or receivers. A coexistence manager may exchange data and/or control signaling with the wireless transmitters and/or receivers during to performing the calibration.10-28-2010
20090197537Enhancing voice communication between a group of users in a network - Voice communication is enhanced between a group of users in a network by providing data for transmission to the group of users; adding to the data other information relating to a new active user; and transmitting the combined data and information in a single message to all other users in the group.08-06-2009
20090061779METHOD FOR ADDRESSING USER LOCATION ERRORS IN A COGNITIVE RADIO SYSTEM - A cognitive radio (CR) system (03-05-2009
20100291877WIRELESS COMMUNICATION SYSTEM, INTERFERENCE CANCELLING STATION, AND INTERFERENCE CANCELLING METHOD - An interference cancelling station ICS includes a transmission weight factor calculating unit calculating a transmission weight factor w11-18-2010
20100291876TECHNIQUES FOR REDUCING NOISE AND INTERFERENCE IN WIRELESS COMMUNICATION SYSTEMS - A technique for decreasing noise and interference in an uplink of a wireless communication system includes detecting, at a serving base station, noise and interference levels above a threshold. In response to the detecting, a noise and interference measurement frame is scheduled that includes respective allocated portions for respective active subscriber stations and respective unallocated portions that are adjacent to the respective allocated portions and are not allocated to one of the respective active subscriber stations. The respective allocated portions and the respective unallocated portions are configured in a selected pattern in the noise and interference measurement frame. The respective noise and interference levels are determined, at the serving base station, in the respective unallocated portions of the noise and interference measurement frame. One or more rogue subscriber stations, included in the respective active subscriber stations, are then identified based on the respective noise and interference levels associated with the respective active subscriber stations. When it is ambiguous as to whether a subscriber station is a rogue subscriber station, additional noise and interference measurement frames may be scheduled to resolve the ambiguity.11-18-2010
20120083216RADIO TRANSCEIVER AND METHOD FOR RECEPTION OF COMBINED RECEIVE SIGNALS - A radio transceiver comprising at least two individual receive paths and at least two individual transmit paths is disclosed. The radio transceiver includes a first filter arrangement for separating individual ones of the at least two individual transmit paths from a combined one of the at least two individual receive paths, a splitter for splitting the combined one of the at least two receive paths into the individual receive paths; and a second filter arrangement for separating combined receive bands on the combined one of the at least two receive paths into individual receive bands on the individual receive paths. A method for the reception of combined receive signals in at least two receive frequency bands is also disclosed.04-05-2012
20120225623Communications Method and Mobile Communication Terminal - The present invention relates to the communications field and describes a communications method and a mobile communication terminal. The communications method and the mobile communication terminal according to the present invention add new capabilities to mobile communication terminals, including cell phones, such that they can choose from a plurality of radio frequency parameter sets for communications. It changes the situation in the past where it was necessary to design a new specific antenna for cell phones as a result of HAC index requirements. To the contrary, cell phones just need to store a plurality of radio frequency parameter sets, and necessary changes to RF parameters can be assessed according to different user demands or external application environments such that the cell phone software can switch to upload the most appropriate RF parameters. Consequently, an antenna can obtain optimal parameters such that a cell phone can obtain optimal radiation properties without the need to design a new antenna and can meet HAC requirements by operators. The present invention can optimize terminal radiation performance, greatly reduce development cost and development time of cell phone design, and save manufacturing cost.09-06-2012
20090017762METHODS AND APPARATUS FOR SUCCESSIVE INTERFERENCE CANCELLATION BASED ON THREE RATE REPORTS FROM INTERFERING DEVICE IN PEER-TO-PEER NETWORKS - In an ad hoc peer-to-peer communication network between wireless devices, a low priory first receiver device calculates and provides three transmission rates to its corresponding first transmitter device to allow higher priority devices to concurrently use a shared frequency spectrum. The first receiver device may wirelessly receive a first pilot signal from the first transmitter device and a second pilot signal from a second transmitter device. The second pilot signal indicating that the second transmitter device intends to transmit a second traffic signal that will interfere with the first traffic signal. The first receiver device then determines 1) a first transmission rate as a function of the second pilot signal, 2) a second transmission rate as a function of the first and second pilot signals, and 3) a third transmission rate as a function of the first pilot signal. The three transmission rates are then sent to the first transmitter device.01-15-2009
20090017761METHODS AND APPARATUS FOR SUCCESSIVE INTERFERENCE CANCELLATION BASED ON TWO RATE FEEDBACK IN PEER-TO-PEER NETWORKS - In an ad hoc peer-to-peer communication network between wireless devices, a high priory first receiver device is configured to perform successive interference cancellation. A first pilot signal is received by the first receiver device from the first transmitter device. Similarly, a second pilot signal is received from a second transmitter device, the second pilot signal indicating that the second transmitter device intends to transmit a second traffic signal. The first receiver device determines a first and a second transmission rates for traffic transmissions from the first transmitter device. A control message is then transmitted by the first receiver device to the first transmitter device including the first and second transmission rates. Subsequently, the first receiver device wirelessly receives a traffic signal including a first traffic signal from the first transmitter device including a first and a second signal components generated from a first and a second codewords, respectively.01-15-2009
20090017759METHODS AND APPARATUS FOR ACTIVE SUCCESSIVE INTERFERENCE CANCELLATION IN PEER-TO-PEER NETWORKS - In an ad hoc peer-to-peer communication network between wireless devices, a high priory first receiver device is configured to perform successive interference cancellation (SIC). The first receiver device sends a first rate report signal and a second rate report signal to a first transmitter device indicating a first and second transmission rates. A connection is established between the first transmitter device and the first receiver device in which the first receiver device is the intended receiver of traffic signals from the first transmitter device. The first receiver device receives a traffic signal in a subsequent traffic channel, the traffic signal including a first traffic signal from the first transmitter device having a first traffic transmission rate not exceeding the first transmission rate. The received traffic signal also includes a second traffic signal transmitted by an interfering second transmitter device having a second traffic transmission rate not exceeding the second transmission rate.01-15-2009
20110124289Opportunistic Network Interference Cancellation For Wireless Networks - Embodiments are described herein to provide improvements to known network interference cancellation techniques. One general approach involves a receiver attempting to decode (05-26-2011
20100240312APPARATUS AND METHOD FOR INTERFERENCE AVOIDANCE IN MIXED DEVICE-TO-DEVICE AND CELLULAR ENVIRONMENT - In accordance with an example embodiment of the present invention, a method is disclosed that comprises collecting a set of neighbor cellular user equipment (UE) interferences from at least one neighbor cellular UE at a device-to-device (D2D) UE at least in part based on a decoded first uplink radio resource management (RRM) message and computing a first set of average neighbor UE interferences based on the set of collected neighbor cellular UE interferences. The method also comprises predicting at least one interference scenario at least in part based on the first set of average neighbor cellular UE interferences and a decoded second uplink RRM message. The method also comprises selecting a resource for data transmission to a pairing D2D UE at least in part based on the first set of average neighbor cellular UE interferences, and transmitting data over the selected resource to the pairing D2D UE.09-23-2010
20120231742SCORE-BASED INTERFERENCE COORDINATION IN WIRELESS COMMUNICATION SYSTEMS - An interference coordination method for a radio communication system includes a plurality of user equipment configured to communicate on radio resources with transceiver stations exchanging between transceiver stations one or more coordination messages concerning interference on an interfered radio resource, and determining a score of a potential allocation of the interfered radio resource to potentially-interfered user equipment based on said coordination message or messages. In particular, the radio resource scheduling method includes generating, for a transceiver station serving respective served user equipment, a set of candidate aggregate allocations including corresponding potential allocations of radio resources to respective served user equipment, performing the interference coordination method to determine a score of each potential allocation in the candidate aggregate allocations, computing a total score of each candidate aggregate allocation based on the scores of the corresponding potential allocations, and allocating radio resources to respective served user equipment based on the total scores of the candidate aggregate allocations.09-13-2012
20110003553APPARATUS AND METHOD FOR ALLOCATING DOWNLINK CONTROL CHANNEL - A method for allocating a downlink control channel in a fractional frequency reuse (FFR) system, includes: dividing a service frequency band of the system into a plurality of frequency partitions including a first frequency partition corresponding to a first frequency reuse factor, a second frequency partition corresponding Kth frequency reuse factor, and a third frequency partition; setting a transmission power level for each of the plurality of divided frequency partitions; allocating a downlink common control channel including non-user specific (NUS) control information common to every user to a particular frequency partition corresponding to the highest transmission power level among the set transmission power levels; and transmitting the NUS control information through the particular frequency partition.01-06-2011
20110003552METHOD AND APPARATUS FOR DOWNLINK BEAM FORMING IN TD-CDMA SYSTEM - The present invention discloses a method and an apparatus for downlink beam forming in a TD-CDMA system. The method includes: acquiring the spatial covariance matrixes of all uplink slot interference user signals and the downlink slots in which the interference user signals locate; obtaining the interference spatial covariance matrixes of each downlink slot based on the downlink slots in which the interference user signals locate and the spatial covariance matrixes of the interference user signals; determining the beam forming weight coefficient of downlink expected user signals based on the interference spatial covariance matrixes of each downlink slot and the spatial covariance matrixes of the downlink expected user signals; implementing beam forming based on the beam forming weight coefficient of downlink expected user signals. The invention determines the downlink slots in which all interference user signals locate and calculates the interference spatial covariance matrixes of all downlink slots, so that the beam forming weight coefficients of all downlink expected user signals are obtained to implement beam forming. Therefore, the beam forming method in the invention is feasible in the cases of both slot symmetry and slot asymmetry.01-06-2011
20110039497Compensation for Propagation Delay in a Wireless Communication System - In a first aspect the present invention relates to a method of compensating for propagation delay in a wireless communication system. A first base station is in communication with a first plurality of antenna units which are adapted to be in wireless communication with a first terminal. The first terminal having a terminal antenna. The first plurality of antenna units is spatially separated. The method according to the first aspect comprises the steps of determining relative propagation delay from each of the first plurality of antenna units to the terminal antenna and using the determined propagation delay to establish a delay profile to compensate for propagation delay from each of the antenna units to the first terminal and applying the delay profile to a transmission between the base station and the terminal. In a second aspect the present invention further relates to a system implementing the method according to the first aspect.02-17-2011
20110039496System, Method and Computer-readable Medium for Actively Cancelling Interference Signals - This invention discloses a system, method and computer-readable medium for actively cancelling interference signals. The system mentioned above communicates with at least one first transceiver. The abovementioned system includes at least one second transceiver, and a relay base station receiving a feedback signal from the at least one second transceiver and an environmental signal to execute a signal correlation function to get a result and determining to generate an anti-interference signal depending on the result. Herein, the relay base station cancels interference signals around the at least one first transceiver by sending the anti-interference signal to the at least one first transceiver via at least one third transceiver having an optimal communication channel to the at least one first transceiver.02-17-2011
20110045776METHOD AND APPARATUS FOR DETECTING OFDM SIGNALS IN THE PRESENCE OF FREQUENCY ORTHOGONAL OFDM INTERFERERS - Certain aspects of the present disclosure relate to techniques and apparatus for detecting Orthogonal Frequency Division Multiplexing (OFDM) signals in the presence of frequency orthogonal OFDM interferers.02-24-2011
20110045775APPARATUS AND METHOD FOR REDUCING CROSS-TALK BETWEEN AUDIO CHANNELS IN A MOBILE TERMINAL - An apparatus and a method for reducing cross-talk between audio channels in a mobile terminal are provided. The apparatus includes an ear jack, a radio signal tuner, a baseband, and a switching unit. The ear jack includes a common port for a reference potential of an earphone and a radio signal. The radio signal tuner processes a radio signal input via the common port. The baseband determines an on/off state of a radio reception function to output a control signal. The switching unit connects the common port of the ear jack to one of a ground and the radio signal tuner according to the control signal.02-24-2011
20120322385MULTI-ELEMENT MAGNETIC RECEIVER FOR INTERFERENCE SUPPRESSION AND SIGNAL ENHANCEMENT - A system and method for enhancing a magnetic communication signal is provided. A multi-element receiver is used to generate a plurality of input signals. A set of weights is generated using, for example, a calculated covariance of the plurality of input signals, and applied to the signals. The weights are used to generate a single output signal representing a weighted sum of the input signals.12-20-2012
20100233962INTER-CELL INTERFERENCE CONTROL IN AN UPLINK MULTI-CARRIER RADIO COMMUNICATIONS SYSTEM - A multi-carrier cellular radio communication system includes a serving base station associate with a serving cell currently serving a mobile radio and a non-serving base station within range of the mobile radio and associated with a non-serving cell. The mobile radio can transmit to the serving base station at the same time over multiple radio frequency carriers. An estimate is made of inter-cell interference in the non-serving cell caused by uplink transmission by the mobile radio over one or more of the multiple radio frequency carriers over which the mobile radio is currently simultaneously transmitting. If the estimated inter-cell interference in the non-serving cell exceeds a predetermined threshold, then the inter-cell interference in the non-serving cell is reduced or limited by managing radio resources so that the estimated inter-cell interference in the non-serving cell is or becomes less than the predetermined threshold.09-16-2010
20120088453WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A wireless communication apparatus includes: a channel information acquiring unit that, acquires a transmitted signal channel matrix that is channel information as a transmitted signal of a pre-interference-removal transmitted signal group and an interference signal channel matrix that is channel information as an interference signal of the non-interference-removed transmitted signal group; an interference signal calculating unit that generates an interference signal group at the time of reception by the non-interference-removed transmitted signal group with respect to the pre-interference-removal transmitted signal group, based on the pre-interference-removal transmitted signal group, the non-interference-removed transmitted signal group, the transmitted signal channel matrix, and the interference signal channel matrix; a subtracting unit that subtracts the interference signal group from the pre-interference-removal transmitted signal group to generate a post-interference-removal transmitted signal group; and a transmission antenna group that transmits the post-interference-removal transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas.04-12-2012
20120100809VARIABLE TIME DELAY CONTROL STRUCTURE FOR CHANNEL MATCHING - A cosite interference cancellation system is provided for improved rejection of a signal coupled from a transmission antenna into a local receive antenna in the presence of local multipath. The cosite interference cancellation system and associated method advantageously provide improved signal rejection by continuously controlling (adjusting) a matching time delay to reduce cosite interference.04-26-2012
20120329400METHOD AND APPARATUS FOR REDUCING INTER-CELL INTERFERENCE IN RADIO COMMUNICATION SYSTEM - A method and apparatus for reducing inter-cell interference in a radio communication system are disclosed. A method for reducing inter-cell interference includes determining REs of a downlink subframe of a first cell overlapping with CRS transmission REs of a downlink subframe of a second cell, determining a portion of REs of the downlink subframe of the first cell overlapping with CRS transmission REs of the downlink sub-frame of the second cell as punctured REs, mapping one or more downlink channel to the downlink subframe of the first cell other than the punctured REs, and transmitting the one or more downlink channel mapped to the downlink subframe of the first cell to a UE.12-27-2012
20120329399METHOD AND APPARATUS FOR DYNAMICALLY ADJUSTING A RISE-OVER-THERMAL OR NOISE RISE THRESHOLD - Methods and apparatuses are provided that include adjusting rise-over-thermal (RoT) or noise rise (NR) threshold based on detecting interference from one or more devices. A device can communicate within close proximity of a femto node such that the device does not respond to power down commands from the femto node due to operating at a minimum transmit power. The device can cause the RoT or NR at the femto node to potentially rise over a threshold, however. Thus, the femto node can increase the RoT or NR threshold to allow the device to communicate with the femto node without impacting other devices communicating with the femto node. Out-of-cell interference from devices communicating with other base stations can be detected as well, and the RoT or NR threshold can be adjusted based thereon.12-27-2012
20100178875Interference Cancellation System and Method for Wireless Antenna Configuration - Presently disclosed is a method for reducing interference in a wireless distributed antenna systems. In an embodiment, interference is reduced by selectively placing a first wireless remote unit in a reduced signal interference mode. A controller sends a signal, such as a reverse link power-down signal, to the first remote unit after detecting less than a threshold incoming signal strength at the first remote unit. In an alternative embodiment, the controller requests that a given remote unit switch to the reduced signal interference mode when the controller is receiving signals from a mobile station through at least two different remote units.07-15-2010
20100178874METHOD FOR PERFORMING ACTIVE JAMMER SUPPRESSION ON ELECTRONIC DEVICE, AND ASSOCIATED APPARATUS - A method for performing active jammer suppression on an electronic device includes: performing down conversion on a received signal having in-band interference, in order to obtain at least one down-converted received signal; performing down conversion on a jammer signal derived from a jammer source causing the in-band interference, in order to obtain at least one down-converted jammer signal; adjusting a phase and/or an amplitude of the down-converted jammer signal to obtain a jammer suppression signal; and performing jammer suppression according to the down-converted received signal and the jammer suppression signal. An apparatus for performing the active jammer suppression on the electronic device includes a received-signal down converter, at least one jammer down converter, and at least one adjustment module. In particular, the adjustment module is arranged to iteratively adjust the phase and/or the amplitude of the down-converted jammer signal to obtain an optimal version of the jammer suppression signal.07-15-2010
20100167655RF TRANSMISSION LEAKAGE MITIGATOR, METHOD OF MITIGATING AN RF TRANSMISSION LEAKAGE AND CDMA TRANCEIVER EMPLOYING THE SAME - The present invention provides an RF transmission leakage mitigator for use with a full-duplex, wireless transceiver. In one embodiment, the RF transmission leakage mitigator includes an inversion generator configured to provide an RF transmission inversion signal of an interfering transceiver RF transmission to a receiving portion of the transceiver thereby creating a residual leakage signal. Additionally, the RF transmission leakage mitigator also includes a residual processor coupled to the inversion generator and configured to adjust the RF transmission inversion signal of the interfering transceiver RF transmission based on reducing the residual leakage signal to a specified level.07-01-2010
20100167653METHODS AND SYSTEMS FOR CO-CHANNEL INTERFERENCE CANCELLATION IN WIRELESS NETWORKS - Certain embodiments of the present disclosure relate to methods for mitigating interference of signals transmitted to a mobile station (MS) from a plurality of neighboring base stations. By applying a proposed spatio-frequency modulation (SFM) technique at a serving base station (BS) and at each interfering BS, a co-channel interference (CCI) from interfering base stations can be efficiently mitigated at the MS and signal transmitted from the serving BS can be more accurately decoded.07-01-2010
20130012135WIRELESS DEVICE AND METHOD OF OPERATION - A wireless device has at least first and second radio systems. A first of the radio systems provides an indication for a second of the radio systems that it is transmitting or is about to transmit. The actual interference caused by transmissions by the first radio system to operation of the second radio system is measured, and/or the likely interference caused by transmissions by the first radio system to operation of the second radio system is estimated. The behaviour of at least one of the first and second radio systems is modified in order to reduce the interference depending on the measured actual interference or estimated likely interference.01-10-2013
20100130133ADAPTIVE SINR CONTROL - An adaptive SINR control process is triggered based on various quality measures associated with the received signal in a mobile device or on a geographic region in which a base station and an interferer are located. As part of the adaptive SINR control process the mobile device reduces the signal level of the received signal, which reduces both the signal strength of the desired signal and interfering signal. If the control process is triggered on the mobile device side, after detecting the presence of interference, the mobile device sends a request that the base station increases its transmit power of the desired signal to improve the receiving SINR in the mobile device. Alternatively, the mobile device may receive information from the base station causing the mobile device to reduce the signal level of the received signal based on quality indicators sent by the mobile device to the base station or based on geographic location of the base station.05-27-2010
20100130134NONLINEAR DISTORTION COMPENSATING APPARATUS AND METHOD - A nonlinear distortion compensating apparatus includes a distortion detector configured to detect nonlinear distortion by reproducing a reception signal and output information on the detected nonlinear distortion as control information to a distortion compensating unit which compensates for the nonlinear distortion and which is included in a transmitter.05-27-2010
20120149306Reducing Signal Interference - A method for interference suppression, including receiving a sample of an aggressor communication signal from a sensor embedded in a flex circuit, emulating interference that the aggressor communication signal imposes on a victim communication signal, and suppressing the imposed interference in response to applying the emulated interference to the victim communication signal. In other aspects, the flex circuit comprises a plurality of traces running substantially parallel to one another along a surface of the flex circuit, and the sensor comprises one of the plurality of traces and one of a plurality of traces of another flex circuit. In still other aspects, the flex circuit comprises a plurality of traces running substantially parallel to one another and the sensor comprises a trace of the flex circuit running perpendicular to the plurality of traces running substantially parallel to one another.06-14-2012
20130017795FREQUENCY AGILE DUPLEX FILTER - Systems and methods are disclosed for an electronically adjustable signal filter system, which comprises, in some embodiments, a first filter coupled to an antenna coupling network and a second filter, a power amplifier coupled to the first filter, an antenna connected to an antenna coupling network, a pilot tone generator coupled to the first filter, and a first signal source connected to the power amplifier and first filter. In some embodiments, the power amplifier amplifies the first signal, the first filter places a notch into the first signal transmitted to the antenna coupling network, the antenna coupling network combines the first signal and a second signal received from the antenna and transmits a third signal to the second filter.01-17-2013
20130017794Mitigating Effects of Identified Interference with Adaptive CCA ThresholdAANM Kloper; DavidAACI San JoseAAST CAAACO USAAGP Kloper; David San Jose CA USAANM Chan; DouglasAACI San JoseAAST CAAACO USAAGP Chan; Douglas San Jose CA USAANM Stiff; DavidAACI Los AltosAAST CAAACO USAAGP Stiff; David Los Altos CA US - Techniques are provided to adaptively adjust a clear channel assessment threshold for use when a wireless device is to transmit in a wireless network that operates on a channel in a radio frequency band. A first wireless device, configured to wirelessly communicate with one or more second wireless device in the wireless network, receives energy on the channel in the frequency band, analyzes the received energy to detect interference on the channel and determines a type of interference detected in the received energy. The clear channel assessment threshold is adjusted by an amount depending on the type of interference detected.01-17-2013
20130017793AUTOMATIC GAIN CONTROL CONFIGURATIONAANM Henttonen; TeroAACI EspooAACO FIAAGP Henttonen; Tero Espoo FIAANM Roman; TimoAACI EspooAACO FIAAGP Roman; Timo Espoo FIAANM Callender; ChrisAACI HampshireAACO GBAAGP Callender; Chris Hampshire GBAANM Nielsen; Anders OstergaardAACI FrederiksbergAACO DKAAGP Nielsen; Anders Ostergaard Frederiksberg DKAANM Jansen; KajAACI SaloAACO FIAAGP Jansen; Kaj Salo FI - The invention teaches a solution, for example, for Long Term Evolution (LTE) networks. The solution comprises determining a measurement pattern for at least one automatic gain control tracking loop when resource restrictions have been configured for a user equipment, the resource restrictions comprising at least one measurement restriction pattern, wherein each automatic gain control tracking loop is associated with at least one measurement restriction pattern; and performing automatic gain control measurements according to the measurement patterns of the at least one automatic gain control tracking loop.01-17-2013
20130023216CLOUD SERVICE FOR OPTIMIZING WHITE-SPACE NETWORKS COEXISTENCE - The coexistence of a plurality of different wireless networks that concurrently operate in a common geographic region is optimized. A query is received from a wireless node requesting advice on specific portions of a radio frequency spectrum to use. A spectrum recommendation procedure is then run to generate advice on recommended portions of the radio frequency spectrum for the wireless node to use in order to minimize one or more of interference in the spectrum, or noise in the spectrum, or contention in the spectrum. A recommendation reply is then sent to the wireless node which includes information specifying the recommended portions of the radio frequency spectrum for the wireless node to use in order to minimize one or more of interference in the spectrum, or noise in the spectrum, or contention in the spectrum.01-24-2013
20130023217CAPACITY AND COVERAGE SELF-OPTIMIZATION METHOD AND DEVICE IN A MOBILE NETWORK - The present invention discloses an adaptive cell coverage and capacity optimization method and device in a mobile communication network, aiming to improve adaptive optimization performance of cell capacity and coverage. The technical solutions includes: calculating spectral efficiency of a cell; if the spectral efficiency of the cell is less than a first threshold, starting vertical sectorization processing of the cell to divide the cell into an inner sector and an outer sector, and configuring relevant parameters of the inner sector and the outer sector to improve the spectral efficiency of the cell; calculating spectral efficiency of the outer sector; and if the spectral efficiency of the outer sector is less than a second threshold, starting inter-cell interference coordination to improve the spectral efficiency of the outer sector, and reconfiguring the relevant parameters of the inner sector and the outer sector to improve the spectral efficiency of the cell.01-24-2013
20080242230Method and Apparatus for Increasing Data Throughput - A method, according to various aspects of the present invention, for improving a data throughput between the wireless cell and the client. A wireless cell performs the method. The method includes in any practical order (1) determining a primary direction of data flow between the wireless cell and the client, wherein if the primary direction of data flow is from the wireless cell to the client, denominating the wireless cell as a transmitting device and the client as a receiving device, otherwise, denominating the client as a transmitting device and the wireless cell as a receiving device; (2) the receiving device detecting a factor that reduces data throughput for each one channel of the plurality of channels; and (3) assigning one channel of the plurality of channels to the transmitting device and the receiving device responsive to detecting thereby improving data throughput.10-02-2008
20080233884STRATOSPHERIC-BASED COMMUNICATION SYSTEM FOR MOBILE USERS USING ADDITIONAL PHASED ARRAY ELEMENTS FOR INTERFERENCE REJECTION - A communication system has a stratospheric platform with a payload controller and a phased array antenna having a plurality of main array elements for generating a plurality of communication beams and a plurality of auxiliary elements for canceling interference between the communication beams. A gateway station communicates with the stratospheric platform. The gateway station scales the plurality of elements to form a reconfigurable plurality of beams. The gateway station communicates an embedded control signal to the stratospheric platform to communicate a scaling of elements to form the communication beams and the auxiliary element output. The auxiliary element output is used to provide interference canceling.09-25-2008
20080227398METHOD AND APPARATUS FOR FEEDBACK OVERHEAD REDUCTION IN WIRELESS COMMUNICATIONS - A method and apparatus for reducing feedback transmission overhead in wireless communications. Averaging, compression, or both are used to reduce a number of bits needed for transmission of channel quality information.09-18-2008
20080227397Group LMMSE Demodulation Using Noise and Interference Covariance Matrix for Reception on a Cellular Downlink - A method for filtering in a wireless downlink channel, where all dominant transmitting sources use inner codes from a particular set, includes the steps of estimating a channel matrix seen from a desired transmitter source in response to a pilot or preamble signal; converting the estimated channel matrix into an effective channel matrix responsive to the inner code of the desired transmitting source; estimating a covariance matrix of noise plus interference in a linear model whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitting source inherits the structure of its inner code; computing a signal-to-noise-interference-ratio SINR responsive to the covariance matrix and the effective channel matrix corresponding to the desired source; and feeding back the computed SINR to the transmitter source.09-18-2008
20080227396Communication system - A method for reducing ringing in a signal output from a filter comprising inputting a signal into a filter; filtering a first portion of the input signal to generate a filtered portion of the output signal; analyzing the filtered portion of the output signal; detecting if ringing is present in the filtered portion of the output signal based on said analysis; and adjusting the filter characteristics to reduce ringing in a subsequent filtered portion of the output signal if it is determined that ringing is present.09-18-2008
20130183904COLLABORATIVE INTERFERENCE MITIGATION BETWEEN PHYSICALLY-PROXIMATE NARROWBAND AND BROADBAND COMMUNICATION DEVICES - A communication pathway (07-18-2013
20130102255Method And Apparatus For Transient Frequency Distortion Compensation - Transient distortion is compensated for by multiplying an exponentially-decaying phase shift onto the distorted waveform. The exponentially decaying phase shift waveform is patterned after the transient which typically takes the form of an exponential and occurs upon introduction of power to a circuit or circuit component. A digital circuit produces an appropriate exponentially decaying waveform which is used as the input for a look up table whose output is a complex sinusoidal waveform capable of compensating for the distortion. The complex sinusoid is multiplied onto the transmitted waveform. The decaying exponential is biased so that it crosses a threshold at which point the compensating circuitry is turned off.04-25-2013
20130102254METHOD AND SYSTEM OF INTERFERENCE CANCELATION IN COLLOCATED TRANSCEIVERS CONFIGURATIONS - The present invention, in some embodiments thereof, relates to a method of cancelling interference in a wireless system, wherein the interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, the method comprising acquiring the interfering signal from a transmitter during or before transmission thereof, generating an analog cancellation signal based on the acquired interfering signal, and injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom.04-25-2013
20130143503DOPPLER SHIFT COMPENSATION APPARATUS AND METHOD - The present disclosure relates to a Doppler shift compensation scheme applicable in a high mobility communication system. In some examples, a Doppler shift compensation apparatus may include an angle measuring unit configured to measure Angle Of Arrival (AOA) information of a User Equipment (UE); a velocity calculating unit configured to calculate a velocity information of the UE based on the measured AOA information; a frequency shift estimating unit configured to estimate Doppler shift of the UE based on the measured AOA information and the calculated velocity of the UE; a frequency shift compensation triggering unit configured to trigger Doppler frequency shift compensation based on the estimated Doppler shift of the UE; and a frequency shift compensating unit configured to perform the Doppler frequency shift compensation based on a trigger instruction from the frequency shift compensation triggering unit. Doppler shift compensation methods are also described in some other examples of the present disclosure.06-06-2013
20100279619INTER-CELL INTERFERENCE RELIEF METHOD - In a method of mitigating inter-cell interference, terminals are grouped into groups. A base station transmits data to a first terminal belonging to a first group among the groups, without cooperation with a neighboring base station. The base station transmits data to a second terminal belonging to a second group among the groups, through cooperation with the neighboring base station.11-04-2010
20080207132Communication Apparatus And Communication System - There is disclosed a communication apparatus which wirelessly communicates information with a first other communication apparatus by a first communication method and using a second frequency band which is at least partially overlapping a first frequency band usable according to the first communication method. The communication apparatus includes a first communicator which implements the wireless information communication with the first other communication apparatus by the first communication method, and a requestor which requests the first other communication apparatus, where at least there is a possibility that a field strength of an external radio wave in the second frequency band is equal to or larger than a predetermined threshold, to increase the number of times the first other communication apparatus sends information when making the wireless information communication with the communication apparatus using the second frequency band, as compared to where there is not the possibility.08-28-2008
20080200127Impulse Noise Correction - A method of detecting an impulse noise component for a data transmission signal in a mobile environment includes receiving over a communication channel a demodulated signal having an input signal level subject to a fading condition where the input signal level varies without the presence of the impulse noise component; estimating a variation of the input signal level independently of the impulse noise component under the fading condition to obtain a robust signal level estimate of the signal; and detecting the impulse noise component based on the robust signal level estimate and the input signal level. The method also includes reducing the impulse noise component by cancelling a signal component of the received signal whose impulse noise component has been detected.08-21-2008
20110275326SHORT-PERIODICITY CARRIER ACQUISITION FOR SATCOM INTERFERENCE CANCELLATION - A technique for interference cancellation in a satellite communication system involves an autocorrelation on the hub signal to detect a periodicity in the hub signal, determining a search range for a delay in the hub echo signal in accordance with the periodicity, locating the delay in the hub echo signal, and performing the interference cancellation in accordance with the delay. In the case of periodicity, a delay is acquired (either true or false) that provides cancellation (provided that the period does not change). When the period changes, cancellation is discovered to be poor, and another delay (that may be true or false) is acquired that provides good cancellation and so on.11-10-2011
20100317293BROADCAST SERVICE SIGNAL TRANSMISSION METHOD AND TRANSMISSION DEVICE - When a transmission device transmits a broadcast service signal using a radio signal, the transmission device determines whether there is a moving body that is moving at high speed toward or away from the transmission device, and calculates the amount of Doppler shift of a radio frequency due to high speed movement based on the movement speed of the moving body when there is such a high-speed moving body. Moreover, the transmission device shifts the frequency of the radio signal for transmitting the broadcast service signal by the Doppler shift amount in the opposite direction of Doppler shift direction. By doing so, it is possible for a moving terminal to receive the broadcast service signal from the original radio frequency regardless of Doppler shifting.12-16-2010
20100317292BASE STATION APPARATUS AND INTERFERENCE REDUCING METHOD - A base station has a first antenna for emitting radio waves at a first tilt angle and a second antenna for emitting radio waves at a second tilt angle different from the first tilt angle. If the antennas have different propagation lengths, a transmission diversity gain is not obtained and interference occurs in an adjacent area. In such a case, when one antenna having a shorter propagation length, which means less interference in the adjacent area, is used for transmission, the throughput of each terminal is increased at the area. For example, a controller changes two antenna transmission to one antenna transmission when the difference between the reception qualities of signals sent from the base station and an adjacent base station adjacent to the base station is smaller than a predetermined reference, the reception qualities being measured at the terminal.12-16-2010
20120282861Method and Apparatus for Co-Location of Two Radio Frequency Devices - A method for avoiding signal interference between a first RF circuit and a second RF circuit is provided. The first and second RF circuits are co-located and the first RF circuit is configured to operate in a first frequency range. The second RF circuit is configured to operate in a second frequency range, where the first frequency range overlaps, at least in part, the first frequency range. The method initiates with a controller that is coupled to the first RF circuit and the second RF circuit. Then, the second RF circuit is configured to avoid RF signal collisions with the first RF circuit. An apparatus where two RF devices are co-located without causing interference for each other is also provided.11-08-2012
20130157577INTERFERENCE MANAGEMENT USING OUT-OF-BAND SIGNALING - In at least one embodiment, a method includes receiving a first transmission from a device, the first transmission transmitted at a first frequency. In response to receiving the first transmission, a transceiver is disabled and a second transmission is transmitted to the device, the second transmission transmitted at a second frequency. The method further includes receiving a third transmission from the device, the third transmission transmitted at the second frequency.06-20-2013
20110287720Wide-Bandwidth Signal Canceller - A signal canceller includes a dual-drive electro-optic modulator having separate first and second electrical inputs. The first electrical input is coupled to a first portion of a first signal and the second electrical input is coupled to a second signal and to a second portion of the first signal. A laser generates an optical beam that propagates from the optical input to an optical output of the electro-optic modulator. The dual-drive electro-optic modulator modulates the optical beam with the first and second portions of the first signal and with the second signal. The modulation cancels at least some the first signal and generates a modulation signal with reduced first signal modulation component.11-24-2011
20110312277REQUESTED TRANSMISSION OF INTERFERENCE MANAGEMENT MESSAGES - A set of nodes may communicate in a manner that is asynchronous with respect to the communication between other sets of nodes. To facilitate reservations of resources by different nodes, a node may transmit a message that requests neighboring nodes to limit their interfering transmissions on a given resource and then transmit another message to inform the neighboring nodes that the node is no longer using the resource. To address problems that may be caused by concurrent asynchronous transmissions by different nodes, a messaging scheme may be used to enable a first node to acquire control information transmitted by asynchronous neighboring nodes while the first node was transmitting, and was thereby unable to receive control messages.12-22-2011
20110312276Method for calibrating a terminal with a multi-sector antenna, and mesh network terminal - The invention relates to a method for calibrating a terminal with a multi-sector antenna in a mesh broadcasting network that comprises at least one other terminal. The method includes: the selection of one sector of the terminal antenna to be calibrated, the reception by the selected sector, of identification signals transmitted by each of the other terminals present in the network, as well as the information on the received signal level; and the storage, for each sector, of different identification signals of the terminals present in the network, and of the information on received signal level, into the memory of the terminal to be calibrated.12-22-2011
20110312275SIGNAL RECEPTION METHOD AND APPARATUS FOR NON-STATIONARY CHANNELS - A signal reception method includes receiving a signal over a channel, producing a first equalized signal, a first interference suppression filter and a first estimate of the channel using a portion of a the received signal, dividing the received signal into a plurality of signal blocks, and for each one of the plurality of signal blocks, producing a second equalized signal using a portion of the first equalized signal by selecting from one of a linear estimator or a non-linear estimator and estimating symbols received in the one of the plurality of signal blocks based on the second equalized signal.12-22-2011
20130189927INTERFERENCE ELIMINATION METHOD, INTERFERENCE ELIMINATION DEVICE, AND COMMUNICATION SYSTEM - Embodiments of the present invention provide an interference elimination method, an interference elimination device and a communication system, which are used to implement the effective elimination of signal interference of a receiving end. The method includes: according to a received signal, reconstructing a main cell signal, obtaining the reconstructed main cell signal, and subtracting the reconstructed main cell signal from the received signal, so as to obtain a first residual signal; according to the first residual signal, reconstructing an interference cell signal, and obtaining the reconstructed interference cell signal; and according to the received signal and the reconstructed interference cell signal, obtaining an interference-eliminated main cell signal. According to the interference elimination method, the interference elimination device and the communication system in the embodiments of the present invention, the interference elimination may be performed on the received signal effectively.07-25-2013
20120021689SIGNALING METHOD AND DEVICE FOR MITIGATING INTERFERENCE IN M2M COMMUNICATION SYSTEM - A signaling method for mitigating interference by a device in a machine-to-machine (M2M) communication system. The device measures reference signals transmitted from other devices, and determines a Neighbor Device Set (NDS) including at least one device whose signal power is greater than or equal to a first threshold. Based on the measured values of the reference signals, the device sets up M2M communication with a first device, for data communication, and determines a Restricted Device List (RDL) including at least one device causing interference unallowable for communication with the first device based on the measured value of the reference signal from at least one device in the NDS. The device also transmits the RDL to at least one device in the NDS or the RDL, thereby mitigating the overall system interference.01-26-2012
20120021688METHOD AND APPARATUS FOR SWITCHING BETWEEN SINGLE USER DETECTION AND MULTI USER DETECTION - Certain aspects of the present disclosure propose methods and apparatuses for detecting whether a user device is scheduled for a single user (SU) multiple-input multiple-output (MIMO) communication mode or for a multi-user (MU) MIMO communication mode. In an aspect, a method for wireless communications is provided which includes measuring, at a first apparatus based on received pilot signals, a first receive power corresponding to a first channel associated with the first apparatus, measuring, based on the received pilot signals, a second receive power corresponding to a second channel associated with at least one potentially present second apparatus, measuring a residual interference based on the received pilot signals, and determining, based on at least one of the first receive power, the second receive power and the residual interference, whether to apply a MU detection or a SU detection for estimating data received at the first apparatus.01-26-2012
20120021687Geo-Directed Adaptive Antenna Array - Systems and methods for on-the-fly characterization of an arbitrary array of antenna elements are provided. An array of arbitrary antenna elements and a reference receiver is provided. A location for a target source of signals is provided or assumed. Cross ambiguity functions are computed between the signal received by the reference receiver and the signal received by each antenna element. The cross ambiguity functions are analyzed to determine the phase and amplitude response of the antenna array to signals originating from the location of the target source of signals.01-26-2012
20120028584System and Method for Self-Organized Inter-Cell Interference Coordination - A system and method for self-organized inter-cell interference coordination are provided. A method for controller operations includes receiving signal power measurements at a controller, determining an interference level based on the signal power measurements, generating relationship information based on the interference level, and determining frequency reuse modes for communications controllers controlled by the controller based on the relationship information.02-02-2012
20120040620Method to trigger in-device coexistence interference mitigation in mobile cellular systems - A method to trigger in-device coexistence (IDC) interference mitigation is provided. A wireless device comprises a first radio module and a co-located second radio module. The first radio module measures a received radio signal based on a plurality of sampling instances. A control entity obtains Tx/Rx activity of the second radio module and informs Tx/Rx timing information to the first radio module. The first radio module determines a measurement result based on the obtained timing information. The first radio module triggers an IDC interference mitigation mechanism if the measurement result satisfies a configurable condition. In one embodiment, the first radio module reports IDC interference information and traffic pattern information of the second radio module to a base station for network-assisted coexistence interference mitigation. The IDC triggering mechanism prevents unnecessary and arbitrary IDC request from the device and thus improves network efficiency.02-16-2012
20130203356SIGNAL ENHANCEMENT - Technologies and implementations for signal enhancement are generally disclosed.08-08-2013
20120071103MULTI-RADIO COEXISTENCE - A method of wireless communication includes adjusting a channel quality indicator (CQI) to compensate for coexistence interference experienced between communication resources (such as an LTE radio and a Bluetooth radio). The CQI may be set to zero, falsely indicating to a serving enhanced NodeB that a UE is out of range, thereby creating a gap in LTE operation that may be used by an alternate radio access technology. To compensate for fluctuating interference, the CQI may be adjusted to incorporate average coexistence interference over a period of time. Alternatively, the CQI at a time may incorporate coexistence interference regardless of whether interference is experienced at that specific time. A CQI value may also be boosted to compensate for a CQI backoff. CQI may be adjusted to avoid a spiral of death effect.03-22-2012
20120094605DEVICE AND METHOD FOR REDUCING AN ERROR SIGNAL COMPONENT OF A TRANSMIT SIGNAL IN A RECEIVE SIGNAL - A device for reducing an error signal component of a transmit signal in a receive signal, including an interface, a transmit signal generator, a transmitting/receiving device, a correction signal generator and a combiner. The combiner is configured to combine the receive signal with a correction signal from the correction signal generator in order to reduce the proportion that is based on the known wideband error signal component of the transmit signal in the receive signal.04-19-2012
20130210365METHOD AND SYSTEM FOR ENABLING A MOBILE DEVICE TO INTERFACE WITH A MEDICAL DEVICE - A method and system for enabling a mobile device to interface with a medical device. The embodiments herein relate to patient healthcare monitoring and, more particularly, to use of a mobile device used in patient healthcare monitoring. The embodiments herein disclose a method and system for a mobile device to control or interface with a medical device in a deterministic manner. The mobile application module uses the hardware resources of the mobile device to control or interface with the medical device. This enables the mobile device to fully control or interface with the medical device without any disturbance.08-15-2013
20130210364Methods for Mitigating Effects of Radio-Frequency Interference - An electronic device may include sensitive circuitry such as radio-frequency receiver circuitry. A noise source may produce radio-frequency interference that can disrupt operation of the sensitive circuitry. The noise source may include a first transmitter such as a cellular telephone transmitter and as second transmitter such as a wireless local area network transmitter. Interference may be produced by simultaneous operation of the first and second transmitters. The radio-frequency receiver circuitry may be satellite navigation system receiver circuitry that includes one or more satellite navigation receivers. The impact of interference may be reduced by blanking the satellite navigation system receiver, by imposing a duty cycle limitation on the second transmitter, by switching between alternative receivers in the satellite navigation system receiver circuitry, by using an interference-dependent cross-correlation protection scheme, or by using a combination of these schemes.08-15-2013

Patent applications in class Distortion, noise, or other interference prevention, reduction, or compensation

Patent applications in all subclasses Distortion, noise, or other interference prevention, reduction, or compensation