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Antinoise or distortion

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375 - Pulse or digital communications

375259000 - SYSTEMS USING ALTERNATING OR PULSATING CURRENT

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DocumentTitleDate
20130028346COGNITIVE RADIO RESOURCE UTILIZATION - The present document discloses a solution for utilizing guard time intervals of another wireless communication system. First, it is detected in a first wireless communication apparatus of a first wireless communication system a guard time interval following a transmission of a second wireless communication apparatus of a second wireless communication system. Thereafter, the first wireless communication apparatus is configured to schedule a transmission in the first wireless communication system to a transmission time interval starting on or after the beginning of the detected guard time interval and ending within the detected guard time interval of the second wireless communication system.01-31-2013
20120163490METHODS AND APPARATUS FOR THE INTELLIGENT ASSOCIATION OF CONTROL SYMBOLS - Methods and apparatus for the intelligent association of control symbols with special symbols that are transmitted over a network. In one embodiment, the association is utilized to improve DC-balance on a transmission medium. In an exemplary variant, the special symbols originate from line codes such as the 8B/10B line code, which format a digital signal so that is optimized for transmission over a given physical channel. These control symbols are divided up according to a first criterion, while the special symbols are further divided up according to a second criterion. The divided control symbols are then allocated to the divided special symbols using a pre-designated allocation algorithm, which may or may not include a scrambling algorithm. The allocation of the control symbols improves signal characteristics and electromagnetic interference (EMI) when various ones of control symbols are ultimately transmitted over a given transmission medium.06-28-2012
20100080318SYSTEM AND METHOD FOR IMPROVED FREQUENCY ESTIMATION FOR HIGH-SPEED COMMUNICATION - A system and method is provided for improved frequency error estimation in a high-frequency data communication system. In an embodiment, a method for providing improved frequency error estimation comprises performing encoding, interleaving and symbol mapping on original information bits to form a data stream of modulated information symbols; inserting pilot symbols into the data stream at progressively longer time intervals and transmitting the data stream as a radio signal from a data transmitter to a receiver. The method further comprises using the received pilot symbols, transmitted at progressively longer time intervals to perform frequency error estimation. In certain embodiments, the received pilot symbols may also be used to perform improved channel estimation updates.04-01-2010
20100074365System and method for the transmission of signals - A method and a transmission system are disclosed for the transmission of wanted signals between a sensor and an evaluation unit. In order to suppress interference to the sensor signals due to external interference sources as far as possible, at least one embodiment of the inventive system has at least one signal receiver with the sensor for detecting a wanted signal and a signal processing device for conditioning the wanted signal, at whose output a mixed signal with a wanted signal component and an interference signal component from at least one interference source are present; an interference source signal input for detecting at least one interference source signal of the at least one interference source; a filter device for reconstructing the interference signal component as a function of the at least one interference source signal; and a subtractor for eliminating interference superimposed on the wanted signal.03-25-2010
20100074364PRECODING DEVICE AND METHOD IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a precoder and a precoding method in a multi-user multi-antenna communication system. When a transmission part having a plurality of antennas transmits a plurality of signals to a receiving part having an antenna, the precoder and the precoding method using the same prevents system performance degradation caused by interference signals and efficiently reduces transmission power while changing the constellation rotary angle. When the power is controlled by using the precoder, the system performance is enhanced while not damaging the structural gain of the existing multi-user multi-antenna precoder.03-25-2010
20100074363SYSTEM AND METHOD FOR SUPPRESSING NOISE BY FREQUENCY DITHER - A system for suppressing noise by frequency dither includes a transmitter, receiver and a frequency dither circuit, as well as a cavity along a propagation path of the electromagnetic signal between the transmitter and the receiver. The transmitter is configured to transmit an electromagnetic signal to the receiver at each of one or more selectable frequencies. The frequency dither circuit is configured to apply a frequency dither to the electromagnetic signal transmitted from the transmitter to the receiver at each of the selectable frequencies. In this regard, the applied frequency dither has a span having been selected as a function of a minimum frequency period of an expected standing wave in the system, and a rate having been selected as a function of a signal processing bandwidth for sampling a frequency spectrum including the selectable frequencies.03-25-2010
20100046659METHOD AND NETWORK SUITABLE FOR INCREASING THE SINR OF A DATA TRANSMISSION CHANNEL - A method for increasing the SINR of a data transmission channel is presented. A mobile network element, in applying a first method, performs a first estimate of the channel's SINR by changing a first characteristic of a signal transmitted through the channel. The mobile network element, in applying a further method, performs a further estimate of the channel's SINR by changing at least one further signal characteristic of the signal. The mobile network element selects which method yields a higher estimate of the channel's SINR. The mobile network element transmits a feedback signal to at least one affiliated base network element indicating the selected method that yields the highest channel SINR. Applying the selected method, the affiliated base network element changes the corresponding characteristic of a signal it transmits, thereby increasing the channel's SINR.02-25-2010
20100046661RECEIVING APPARATUS AND MOBILE COMMUNICATION SYSTEM - A receiving apparatus is provided in which a single carrier signal is received by a plurality of receiving antennas, and multipath equalization and other cell interference suppression are carried out in a frequency domain at a same time. A plurality of antennas 02-25-2010
20130136203Method, Device and System for Configuring Codebook - The present invention discloses a method, device and system for configuring codebooks. The method comprises a transmitting end selecting a code word restricted sub-set and informing a receiving end of the code word restricted sub-set, the code word restricted sub-set containing part or all of code words in a first codebook and/or a second codebook; and the receiving end selecting an optimal pre-coded code word from the code word restricted sub-set and informing the transmitting end of an index of the optimal pre-coded code word. By the present invention, code word restriction is implemented in the case of dual codebooks in the LTE-A system such that the calculation complexity is reduced when the receiving end selects the code word, occurrences of the case where the receiving end selects the code word wrongly are decreased, and the signaling structure in the LTE system can be inherited very well.05-30-2013
20100104041TRANSMISSION METHOD, TRANSMISSION SYSTEM, TRANSMISSION DEVICE AND RECEPTION DEVICE04-29-2010
20100104042COMMUNICATION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE, AND COMMUNICATION METHOD - There is provided a communication system capable of achieving a high usage efficiency of frequencies without the need for cooperation of multiplexed users. A communication system communicates over frequency channels set by dividing a frequency bandwidth assigned to the system allows interference between channels by overlapping the adjacent frequency channels with each other in the frequency domain, or a transmitting and receiving device, which transmits and receives a signal by allowing the interference between symbols at a waveform level for each channel to decrease the occupied bandwidth, is provided with ICI removal and ISI compensation filter 04-29-2010
20120183092ANALOG CONTINUOUS TIME MATCHED PULSE SHAPING TRANSMITTER AND RECEIVER FILTERS - The present invention provides a transmission system, including: a transmitter including a transmitter filter; a receiver including a receiver filter; and a communicative coupling between the transmitter and the receiver; wherein the transmitter filter and the receiver filter are matched for noise reduction, and wherein the combined responses of the transmitter filter and the receiver filter satisfy the Nyquist criteria. Optionally, the transmitter filter includes a pulse shaping quasi digital finite impulse response filter. Optionally, the receiver filter includes an inductor-capacitor ladder based filter.07-19-2012
20120183094DATA TRANSMITTING DEVICE AND DATA TRANSMITTING/RECEIVING METHOD - A data transmitting device includes a coded-data generating unit and a data transmitting unit. The coded-data generating unit divides transmission data by a predetermined number in accordance with a data size of the transmission data and then adds a redundant code to the divided transmission data at a predetermined ratio or adds the redundant code to the transmission data at the predetermined ratio so as to generate multiple blocks of coded data. The data transmitting unit groups together the multiple blocks of coded data generated by the coded-data generating unit into a number of blocks that are inserted into a transmission data block, which has a predetermined size, and then transmits the transmission data block.07-19-2012
20120183093Power Setting and Pre-Coding for Wireless Data Transmission from Multiple Locations to a Single Device - In one embodiment, a mobile device determines channel coefficient matrices for radio transmission from antennas at a plurality of locations, generates a power scaling vector based on the channel coefficient matrices, and selects one or more pre-coding matrices based on at least in part the power scaling vector. The antennas are operably connected to one or more base stations. The mobile device transmits the selected pre-coding matrices and the power scaling vector to the base stations, causing the base stations to transmit further data to the mobile device based on the selected pre-coding matrices and the power scaling vector.07-19-2012
20100067610Ultra-Narrow Bandwidth Radio Frequency Communications Link - The present invention is a dramatically enhanced RF link for low-data-rate applications (1-100 bps), using one or more transmitters to communicate with one or more receivers, at dramatically enhanced ranges. The receiver of the present invention can rapidly search, detect, and lock in on narrow band signal transmissions, that may be present in a much larger frequency band and which may be changing frequency during the duration of the message. These receivers enable ultra-low noise floor detection of longer range, more highly attenuated, signal transmissions, by decreasing the receiver bandwidth.03-18-2010
20130058428METHOD AND APPARATUS FOR TRANSMITTING PRECODING MARTRIX INDEX AND PERFORMING PRECODING - A method and an apparatus for sending a Precoding Matrix Index (PMI) and performing precoding are provided in the embodiments of the present invention. The method for sending the PMI comprises the following steps: a user equipment acquires the transmission channel capability of carrying the PMI; according to the transmission channel capability of carrying the PMI, the precoding matrices are selected from a locally-stored first codebook set to form a second codebook set; a first precoding matrix is selected from the second codebook set; an index corresponding to the first precoding matrix is sent to a base station over the transmission channel so as to make the base station can find out the first precoding matrix according to the index and precode the data according to the first precoding matrix. The embodiments of the present invention can realize the flexible configuration and use of the PMI.03-07-2013
20110013715METHOD FOR SETTING CYCLIC SHIFT CONSIDERING FREQUENCY OFFSET - A method for establishing a cyclic shift sequence to provide against the frequency offset is disclosed. The method calculates a distance between a channel response position of the sequence and an alias channel response position caused by a frequency offset, calculates the number of cyclic shifts per group according to the calculated distance, and establishes the cyclic shift (CS)-applying interval. This method easily establishes a cyclic shift (CS) interval at a specific location having no overlapping by considering a channel response of a reception (Rx) sequence and an alias location of this reception (Rx) sequence, although a reception (Rx) signal is shifted by a channel delay spreading or a propagation delay irrespective of categories of a domain generating a sequence, so that it can greatly reduce the number of the detection errors and the false alarm rate. And, if a sequence of the cyclic shift (CS) is allocated to a cell having a frequency offset of more than a predetermined level, the present invention can minimize the influence of a frequency offset on a high-mobility cell.01-20-2011
20130058427COMMUNICATION SYSTEM WITH MODULATION CLASSIFIER AND METHOD OF OPERATION THEREOF - A method of operation of a communication system includes: calculating a shift distance of a received signal having a distortion; calculating an approximate likelihood of the received signal matching a transmitted signal from the shift distance; determining a bias factor from the distortion; and selecting a determined modulation maximizing a combination of the approximate likelihood and the bias factor for communicating with a device.03-07-2013
20120114063METHOD, APPARATUS AND SYSTEM FOR ELIMINATING ALIASING NOISE IN MULTI-CARRIER MODULATION SYSTEM - A method, an apparatus and a system for eliminating aliasing noise in a multi-carrier modulation system are disclosed. The method includes: acquiring a first power spectrum density template; acquiring information of in-band subcarriers whose aliasing noise is greater than background noise, and acquiring a difference between the aliasing noise and the background noise of the in-band subcarriers; adjusting the first power spectrum density template according to the information of the in-band subcarriers and the corresponding difference to obtain a second power spectrum density template; and sending signals according to the second power spectrum density template. The method, the apparatus, and the system disclosed herein eliminate the aliasing crosstalk noise, improve the performance and stability of in-band services without involving upgrade or modification of the Customer Premises Equipment (CPE), and are easy to implement.05-10-2012
20120114062PREPROCESSING METHOD, BASE STATION, AND SYSTEM FOR COOPERATIVE COMMUNICATION - A preprocessing method for cooperative communication and a base station and a system for executing the method are provided. The method includes: obtaining a common base station group from a cooperative base station group of a user terminal, in which the common base station group includes a set of base stations providing a cooperative service for other user terminals in the cooperative base station group; and calculating a first precoding matrix of the user terminal according to the common base station group, in which the first precoding matrix is used to perform elimination preprocessing on interference from the user to other user terminals served by the common base station group. The method reduces Multi-User Interference (MUI).05-10-2012
20120114061COMMUNICATION SYSTEM FOR RECOGNIZING TYPE OF NOISE SOURCE - Provided is a communication system that includes setting a detection threshold according to a distribution of at least one logic value of a transmission signal corresponding to an on-off keying (OOK) scheme or a frequency shift keying (FSK) scheme, and determining a type of noise source influencing a reception signal using the detection threshold and the distribution of at least one logic value.05-10-2012
20120114060MULTIPLE-INPUT, MULTIPLE-OUTPUT COMMUNICATION SYSTEM WITH REDUCED FEEDBACK - In MIMO systems, two or more transmit signals are transmitted from different antenna clusters having one or more transmit antennas each. A precoding circuit weight the transmit signals transmitted from each transmit antenna using a common set of frequency independent antenna weights for all antenna clusters. The antenna weights are computed based on correlations between transmit antennas in the same antenna cluster.05-10-2012
20110075754MITIGATION OF TRANSMITTER PASSIVE AND ACTIVE INTERMODULATION PRODUCTS IN REAL AND CONTINUOUS TIME IN THE TRANSMITTER AND CO-LOCATED RECEIVER - A transmitter channel interference mitigation processing method for cancellation of intermodulation products are described. In one embodiment, a method comprising generating continuous and real time IMP cancellation signals (ICS) in the baseband digital signal set of the transmitter based on a transmitter signal set, combining digital IMP cancellation signals with a digital baseband transmitter signal set such that the digital cancellation signals, when converted to analog signals and transmitted as part of an analog transmitter signal set, are cancelled by and so cancel the IMPs generated by the non-linear components in the analog transmitter hardware, including digitally generating the IMP cancellation signals using a process based on a power series description of a non-linear process generating the IMPs, generating 303-31-2011
20090135945ECHO CANCELLATION AND ECHO CHANNEL ESTIMATION SYSTEM USING MULTIPLE ANTENNAS - Disclosed herein is an echo cancellation and echo channel estimation system that can relay transmit signals without interference with echo signals by canceling the undesired echo signals received by a relay. The echo cancellation and echo channel estimation system is designed to relay signals between a transmitter and a receiver through a relay using multiple antennas. The echo cancellation and echo channel estimation system includes a receive antenna, a preprocessing vector generation module, an echo cancellation module, and a transmit array antenna. The receive antenna receives a transmit signal from the transmitter and an echo signal via an echo channel. The preprocessing vector generation module generates a preprocessing vector and applies the preprocessing vector, the transmit signal and the echo signal, received from the receive antenna, to the echo cancellation module. The echo cancellation module cancels only the echo signal by multiplying the preprocessing vector, the transmit signal, and the echo signal. The transmit array antenna receives a retransmit signal from the echo cancellation module and resends the retransmit signal to the receiver.05-28-2009
20120288026METHODS AND APPARATUSES FOR IN-PHASE AND QUADRATURE-PHASE IMBALANCE COMPENSATION - At least one example embodiments discloses a method of compensating for in-phase and quadrature (IQ) imbalance in a base station. The method includes generating, at the base station, compensation filter weights based on a plurality of IQ imbalanced training signals, the generating including, determining the compensation filter weights based on the plurality of imbalanced training signals in a frequency domain. The method further includes filtering based on the compensation filter weights.11-15-2012
20110299620METHOD AND APPARATUS FOR INCREASING THE CHANNEL CAPACITY OF A BANDWIDTH LIMITED COMMUNICATIONS PATH - A unique digital compression technology for increasing the information carrying capacity of a bandwidth limited communications path highway by using a combined coding and modulation technique. The inventive technology allows multiple independent modulated data streams to simultaneously and instantaneously share the same bandwidth without cross-channel interference. A matched filter is used to substantially reduce the error rate and utilizes a unique training method based on performing a spectral response test. An algorithm calculates the effect of the unique characteristics of the communications highway on the transmitted signal and generates an ideal signal stored in the matched filter for comparison with received signals.12-08-2011
20110293032METHOD AND APPARATUS FOR MITIGATING THE RESIDUAL CFO EFFECT ON CHANNEL ESTIMATION FOR OFDM RECEIVERS - A CFO tracking loop module comprises: a numerically-controlled oscillator (NCO) that calculates a phase output; a CFO phase error block that generates a corrected NCO phase output by subtracting half of residual CFO phase error from the NCO phase output; a multiplier that corrects pilot subcarrier's phase by multiplying complex values of the pilot subcarriers by a conjugated complex value of the corrected NCO phase output; a pilot processor that generates a phase error by averaging phases over pilot subcarriers; and a loop filter that filters phase error from the pilot processor and updates the NCO with the filtered phase error.12-01-2011
20090274239Prescribed Response Precoding for Channels with Intersymbol Interference - Methods and apparatus are provided for prescribed response precoding schemes for signal transmission in channels with intersymbol interference. An embodiment includes generating a prescribed feedback filter polynomial as the quotient of a feedback filter polynomial and a target polynomial to form a feedback filter in a precoder, where the target polynomial is a divisor of the feedback filter polynomial.11-05-2009
20100111218NOISE REDUCTION CIRCUIT IN A DIGITAL ISOLATOR SYSTEM - The invention is directed to a digital isolation system including an isolation barrier, a transmitter circuit receiving an input signal and transmitting a positive pulse upon detecting a first type of edge in the input signal and transmitting a negative pulse upon receipt of a second type of edge in the input signal and a receiver circuit receiving the transmitted signals, removing noise in the received signal and reconstructing the input signal using a differential comparator.05-06-2010
20120294384CYCLICAL OBSTRUCTION COMMUNICATION SYSTEM - Techniques for improving data rates at mobile terminals that are subject to periodic channel interruptions in a beyond-line-of-sight communication system are disclosed, including improved encoding and decoding systems that identify blockages and modify receiver operation during blockages to reduce data errors. In certain embodiments, encoding, symbol mapping, interleaving, and use of unique periodic identifiers function to enable a series of packets that may be received in a blockage impaired channel with reduced errors.11-22-2012
20100128810SYSTEMS AND METHODS FOR A MULTICARRIER MODULATION SYSTEM WITH A VARIABLE MARGIN - A multicarrier modem has a plurality of carriers over which data is transmitted. By assigning, for example, one or more different margins to the individual carriers the data rate and impairment immunity can be increased.05-27-2010
20120082259Precoding Selection for Retransmission in Uplink MIMO Hybrid ARQ - A method includes obtaining a precoder for retransmission of one codeword responsive to a known precoding matrix of a certain rank and modulation and coding scheme assignments used in an original transmission, and a desired retransmission rank', forming an approximate channel covariance matrix; stimating an a minimum mean square error receiver signal-to-noise-interference-ratio for each layer to be retransmitted responsive to the prior forming; and finding a precoding matrix from a preceding codebook that maximizes a sum-rate for enabling precoding selections for retransmissions in uplink multiple-input multiple-output MIMO hybrid automatic repeat request HARQ.04-05-2012
20090034647TRANSMITTING DEVICE, WIRELESS COMMUNICATION SYSTEM AND TRANSMITTING METHOD - At a time T02-05-2009
20080273622Channel optimization for adaptive information rate schemes - A method, apparatus, and computer program product is described, wherein an information rate or bandwidth of a transmission signal is controlled in response to a channel condition, and qualities of channels are measured over a transmission bandwidth available for transmission of said transmission signal. A carrier frequency for said transmission signal is selected based on the measured channel qualities.11-06-2008
20110007834WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD - To improve throughput by reducing the resource used for transmitting a parameter relating to retransmission control and decreasing the overhead of retransmission control signaling. In a case where a retransmission control method is employed in consideration of adaptive MCS control in which the encoding rate can be changed, the scheduling section sets the MCS in accordance with CQI notified from the communication counterpart apparatus. When transmission data is encoded, the RV parameter bit-number setting section sets the number of bits used for signaling the RV parameter to decrease as the encoding rate of the first transmission is decreased and sets the RV parameter based on the number of bits. For example, in a case where the encoding rate R is R>2/3, two bits are set. In a case where the encoding rate 1/301-13-2011
20100142640METHOD AND SYSTEM FOR SELECTING A PRE-CODING MATRIX - A method for selecting a pre-coding matrix, and a device and a telecommunication system for implementing the method are provided. The method includes calculating a effective signal noise ratio (SNR) at each layer for each pre-coding matrix, comparing the lowest SNR at each layer for each pre-coding matrix against the threshold SNR, selecting a proper pre-coding matrix, and considering high and low SNRs of a system during selection of a pre-coding matrix to achieve good pre-coding effects and improve the system performance.06-10-2010
20090190689SPARSE 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
20080240282METHOD AND APPARATUS FOR QUICKLY DETECTING A PRESENCE OF ABRUPT NOISE AND UPDATING A NOISE ESTIMATE - An apparatus (10-02-2008
20120063532RECEPTION DEVICE, RECEIVING METHOD, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - The filtering unit (03-15-2012
20120063531DYNAMIC DIGITAL COMMUNICATION SYSTEM CONTROL - Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.03-15-2012
20120069928ROBUST PRECODER AND RECEIVER FILTER DESIGN FOR GAUSSIAN INTERFERENCE CHANNEL - A system and method for providing at least one transmit precoder includes transforming at least one of a weighted sum-rate and max-min rate objective into two or more sub-problems by introducing at least one slack variable. The two or more sub-problems are iterated on a computer readable storage medium to provide at least one transmit precoder for each transmitter.03-22-2012
20120069927CQI feedback mechanisms for distortion-aware link adaptation toward enhanced multimedia communications - Link adaptation parameters for encoding of a source are selected to minimize distortion between the source and a reconstructed source induced by transmission of the source over a multiple input multiple output (MIMO) channel. Such distortion-awareness and associated joint source-channel coding ideas to support link adaptation over MIMO channels may affect system architectures for MIMO systems. CQI feedback mechanisms may ensure that these distortion-aware MIMO link adaptation techniques are applicable for downlink channels, under different forms of link adaptation, including MS-controlled vs. BS-controlled link adaptation, long-term vs. dynamic link adaptation, and presence vs. absence of distortion-awareness at the BS, for different kinds of video coding including single-layer compression and layered compression.03-22-2012
20110222622BIT-STUFFING METHOD FOR CROSSTALK AVOIDANCE IN HIGH-SPEED BUSES - This invention discloses a bit-stuffing method for crosstalk avoidance in high-speed buses, which comprises the steps of inputting a plurality of data bit streams in parallel to a data input buffer; the data input buffer sequentially inputting data bits of the data bit streams to a bit-switching unit, and the bit-switching unit switching the data bits to generate bit-switched data; parallelly inputting the bit-switched data to a bit-stuffing encoding unit; the bit-stuffing encoding unit performing bit-stuffing encoding on the bit-switched data to generate encoded data bits and inputting the encoded data bits to an encoded data buffer; and the encoded data buffer outputting the encoded data to a high-speed bus. The encoded data bits passed through the high-speed bus are decoded using a bit-removing method to recover the data bit streams.09-15-2011
20130215990Multiple-Mode Digital Modulation Using a Single Square-Root Nyquist Pulse-Shaping Transmit Filter - In a method of digital communication where the transmitter includes a pulse-shaping filter and the receiver includes a plurality of corresponding matched filters, the pulse shaping filter is approximated to match a plurality of filters of the receiver for reducing the number of transmit shaping filters. The filter comprises a square-root raised cosine (SRRC) filter where the SRRC filter amplitude/phase response is approximated using a typical Parks-McClellan (remez) algorithm for designing linear phase FIR filters which, for a given set of input parameters, outputs a transmit filter coefficient set for the SRRC filter. The input parameters to the Parks-McClellan algorithm are chosen by iteration such that pass-band ripple, 3-dB point, and stop-band attenuation of the transmit filter meet or exceed specification requirements while the resulting transmit-receive filter pair ISI is minimized across a plurality of matched filter specifications.08-22-2013
20090086843DEVICE, SYSTEM AND METHOD OF MITIGATING INTERFERENCE IN A WIRELESS NETWORK - System and method of locating an interferer and mitigating its effect for stations of a wireless local area network. Embodiments provide a protocol and mechanism to evaluate the interferer location relative to a wireless link and to take accurate actions to mitigate the interference effect for specific cases. A method includes classifying a location of an interferer relative to a wireless communication device based on a comparison with a clear-channel threshold and a noise-tolerability threshold of the device, categorizing a location of the interferer relative to a wireless link based on a combination of the interference categories for the transmitting and the receiving devices, and mitigating interference in the wireless network according to the categorization. For example, in some cases, mitigating includes adapting a noise-tolerability threshold of the transmitting device to allow transmission.04-02-2009
20100189190APPARATUSES, SYSTEMS, AND METHODS FOR REDUCING SPURIOUS EMISSIONS RESULTING FROM CARRIER LEAKAGE - An exemplary apparatus includes a modulator configured to modulate a data signal onto a carrier signal to generate a modulated signal having a transmit frequency within a predefined frequency range adjacent to and within a boundary of an uplink frequency band, a filter configured to at least partially remove a carrier frequency component from the modulated signal to produce a filtered modulated signal, and an antenna configured to transmit the filtered modulated signal.07-29-2010
20090116578DISTORTION COMPENSATION IN A COMMUNICATION SYSTEM - In one embodiment of the invention, a modulator mixes a transmit-path signal based on a local oscillator (LO) signal and an amplifier amplifies the mixed transmit-path signal to generate an output signal for transmission. A demodulator generates a receive-path signal based on the output signal and the LO signal. Phase-shift control components provide the output signal and the LO signal to the demodulator during a first time duration and provide a phase-shifted version of one of the output signal and the LO signal to the demodulator during a second time duration. The demodulator generates a second receive-path signal based on the one of the phase-shifted output signal and the phase-shifted LO signal during the second time duration. At least one predistortion circuit adjusts at least one of the transmit-path signal and the receive-path signal based on a difference in signal characteristics of the receive-path signal during the second time duration relative to the first time duration.05-07-2009
20100290554Single Carrier Waveform System with Frequency Domain Equalization - A communications system includes one or more antennas and a receiver coupled to the one or more antennas. The one or more antennas are operable to receive a signal transmitted from a transmitter. The receiver includes a combiner that is operable to combine the signals received by the one or more antennas into a combined signal. The signal received by the receiver is a single-carrier waveform comprising a signal field and one or more data fields after the signal field. The signal field indicates a modulation technique of the one or more data fields. The one or more data fields include a first short unique word, a data payload after the second short unique word, and a second short unique word after the data payload.11-18-2010
20100177838Methods and Apparatuses for Data Transmission - Methods and devices are disclosed involving crosstalk reduction depending on weighting factors or grouping of transmission channels. In other embodiments, other methods or devices may be used.07-15-2010
20100239044Communications Unit and Method - The effects of interference between a communication system operating in a frequency area and another system sending out pulses affecting the frequency area can be handled by means of a of pulses communication unit (RBS09-23-2010
20100232540PREPROCESSING METHOD, PREPROCESSING APPARATUS AND CODING DEVICE - The present disclosure relates to coding and decoding technologies, and discloses a preprocessing method, a preprocessing apparatus, and a coding device. The preprocessing method includes: obtaining characteristic information of a current frame signal; identifying whether the current frame signal requires no coding operation of removing LTC according to the characteristic information of the current frame signal and preset information; and if identifying that the current frame signal requires no coding operation of removing LTC, performing the coding operation of removing STC for the current frame signal; and if identifying that the current frame signal requires the coding operation of removing LTC, performing the coding operations of removing both LTC and STC for the current frame signal. Through the technical solution provided herein, the coding operation of removing LTC is performed for only part of the input frame signals.09-16-2010
20120140839WIRELESS COMMUNICATION APPARATUS - The radio communication device offers data communication with no adverse effect of EMI radiation. In response to EMI radiation detected by the radiation detector, the controller changes the normal communication mode into the avoidance communication mode. In the avoidance communication mode, the transmitter prepares a transmission packet so as to satisfy the following relational expressions: T06-07-2012
20100266065RADIO COMMUNICATION SYSTEM, RECEPTION DEVICE, AND RECEPTION METHOD - A reception device which receives a signal transmitted by a transmission device which changes at least one of a modulation scheme and a coding rate. The reception device includes an equalization unit which equalizes a received signal in frequency domain, a reliability calculation unit which calculates the reliability of a transmitted bit from the received signal after equalization, a mutual information amount calculation unit which calculates a mutual information amount based on the reliability of the transmitted bit calculated by the reliability calculation unit, and a notification signal generation unit which sets at least one of a modulation scheme and a coding rate based on the mutual information amount calculated by the mutual information amount calculation unit to generate a signal to be reported to the transmission device.10-21-2010
20110033006METHOD FOR COMPENSATING SIGNAL DISTORTION IN AN EMITTING PAYLOAD - A method for compensating signal distortion in an emitting payload including determining a compensation transfer function and introducing it within the aggregate response of the payload; choosing an initial tentative compensation transfer function and introducing it within the aggregate response of the payload; acquiring an output signal of the emitting payload; based on the acquired output signal and on a reference signal, corresponding to an expected undistorted output signal, performing an estimation of a residual distortion transfer function of emitting payload; and based on the estimation of the residual distortion transfer function, computing an updated tentative compensation transfer function and introducing it within the aggregate response of the payload. The estimation can be a black-box estimating and the reference signal can be generated on-purpose, and not measured from within the emitting payload.02-10-2011
20090185636PARALLEL AND ADAPTIVE SIGNAL PROCESSING - A method and apparatus for parallel and adaptive signal reconstruction from a multitude of signal measurements. Algorithms and hardware are disclosed to denoise the measured signals, to compress the measured signals, and to reconstruct the signal from fewer measurements than standard state-of-the-art methods require. A parallel hardware design is disclosed in which the methods that are described can be efficiently executed.07-23-2009
20090110106SYSTEM AND APPARATUS FOR ERROR CONTROL CODES BASED ON LAYERING AND LINEAR TRANSFORMATIONS - A powerful new class of methods for encoding digital data for reliable transmission over unreliable communication channels is described. With this method, the message bits are divided into multiple submessages and the bits in each layer are encoded using a standard error correction code to provide a plurality of subcodewords. A first linear transformation is applied to each of the subcodewords. The so-transformed subcodewords from the different submessages are then combined to form a first redundancy block to be transmitted. Additional redundancy blocks are generated by repeating this process on the same message but with jointly related nonidentical sets of linear transformations. The result is a set of codewords for each message which are then used to generate a transmitted waveform in one of several different ways, depending upon the application. For example, the codewords can be used in sequence (temporally) to form a rateless code for transmission over channels of unknown quality, in which case a receiver accumulates as many of the codewords as are necessary to successfully decode. As another example, the codewords can be spatially distributed if the channel has multiple-inputs, as would be the case in a multi-antenna system. As still another example, the codewords can be distributed over subchannels in a frequency-division multiplexing system.04-30-2009
20110122963CODEBOOK RESTRUCTURE, DIFFERENTIAL ENCODING/DECODING, AND SCHEDULING - There is disclosed a method for feedback of channel information characterizing a wireless transmission between a base station and a mobile station over a communications channel. The method involves: receiving a primary identifier identifying a cluster associated with a channel response generated by a mobile station; receiving a differential identifier identifying channel response member within the cluster identified by the primary identifier; locating in a codebook of predetermined channel responses a predetermined channel response identified by said primary identifier and said differential identifier, the predetermined channel responses in the codebook being grouped in a plurality of clusters in accordance with a correlation criterion, each cluster including a plurality of predetermined channel response members; and generating a control signal for controlling transmissions to the mobile station in accordance with said located predetermined channel response.05-26-2011
20110026635WIRELESS RECEIVER, WIRELESS TRANSMITTER, AND FEEDBACK METHOD - Provided are a wireless receiver, a wireless transmitter, and a feedback method, with which the amount of CQI feedback in a MIMO channel is reduced. A channel estimation section (02-03-2011
20110110453SYSTEMS AND METHODS FOR PRIORITIZING BEAMS TO ENABLE EFFICIENT DETERMINATION OF SUITABLE COMMUNICATION LINKS - Methods and systems for enabling the rectification of deteriorated channel conditions on a communication link are described. In particular, the methods and systems can employ mechanisms that prioritize beams in accordance with signal quality measures, direction of departures of transmission beams and/or direction of arrivals of reception beams to address variable channel conditions.05-12-2011
20110026634WIRELESS TRANSMITTER AND RELATED MULTIMEDIA SYSTEM - A wireless transmitter includes a first filtering unit coupled to a first cable for outputting a first DC source transmitted on the first cable, a first power converting unit for converting the first DC source into a second DC source, a second filtering unit for eliminating noise in the second DC source, a first DC blocking unit for blocking the second DC source and outputting a second frequency modulation (FM) signal, an amplifier for amplifying the second FM signal to generate a first FM signal, and a second DC blocking unit coupled to the amplifier and the first cable, for outputting the first FM signal to the first cable, such that the first FM signal is transmitted to the air through the first cable as a transmitting antenna.02-03-2011
20090034646Windowed Level Detector for Partial Response Channels - An estimator of the noiseless output of a noisy partial response channel is described. The estimator operates recursively. In each iteration, the estimator processes a window of the N most recently received noisy channel outputs to compare output level metrics for all possible channel output level, and selects a noiseless output level with maximal posterior probability.02-05-2009
20100172431METHOD AND APPARATUS FOR INCREASING THE CHANNEL CAPACITY OF A BANDWIDTH LIMITED COMMUNICATIONS PATH. - A unique digital compression technology for increasing the information carrying capacity of a bandwidth limited communications path highway by using a combined coding and modulation technique. The inventive technology allows multiple independent modulated data streams to simultaneously and instantaneously share the same bandwidth without cross-channel interference. A matched filter is used to substantially reduce the error rate and utilizes a unique training method based on performing a spectral response test. An algorithm calculates the effect of the unique characteristics of the communications highway on the transmitted signal and generates an ideal signal stored in the matched filter for comparison with received signals.07-08-2010
20110019761SYSTEM, APPARATUS, METHOD, AND PROGRAM FOR SIGNAL ANALYSIS CONTROL AND SIGNAL CONTROL - Disclosed is a signal control method that is characterized by receiving a first signal, a second signal comprising multiple components, component information indicating the relationship between the components, and analysis control information comprising information indicating the relationship between the components and the second signal. The signal control method is further characterized by controlling the first signal or the second signal on the basis of the components and the analysis control information.01-27-2011
20110044397 Analog Echo Canceller with Interpolating Output - A method and system are described for canceling an echo signal with an echo canceller in the analog domain. In one embodiment, a system includes an echo canceller that includes an interpolation unit, operating in a digital domain, that receives a first digital echo estimate signal from an LMS unit and generates a second digital echo estimate signal without oversampling. A digital-to-analog converter (DAC) receives the second digital echo estimate signal and generates an analog echo estimate signal without oversampling. The echo canceller prevents the DAC from adding a high frequency component to the analog echo estimate signal. A subtractor adds the analog echo signal to an incoming signal having an echo signal. The subtractor generates an analog signal with reduced echo signal in the useful frequency band of the incoming signal.02-24-2011
20110135027CHAOTIC WIDE BAND FREQUENCY MODULATOR FOR NOISE REDUCTION - The embodiments of the invention relate to apparatus and method for reducing electromagnetic interference (EMI) and radio frequency interference (RFI) in computer systems via a chaotic wide band frequency modulation. The chaotic noise modulator, in one embodiment, comprises: a master cell to generate a control voltage corresponding to an un-modulated reference signal; and a slave cell having a chaotic signal generator to generate a random noise signal, the slave cell coupled with the master cell and operable to generate a modulated output signal in response to the control voltage.06-09-2011
20110243268WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD - In a wireless communication system including a transmitter device and a receiver device used for transmission of wireless signals having a plurality of sub-carriers, the transmitter device performs error correction coding on transmitting data and selects at least one of the plurality of sub-carriers used for transmission of error-correction coded data as a null sub-carrier having zero amplitude, thus transmitting the error-correction coded data, whilst the receiver device receives signals having the plurality of sub-carriers from the transmitter device so as to retrieve original transmitted data by implementing error correction decoding on received signals, thus determining whether an interference wave occurs in the sub-carrier upon detecting reception power exceeding a predetermined threshold in the sub-carrier serving as the null sub-carrier.10-06-2011
20100098188IMPULSE NOISE MITIGATION - Systems and methods to mitigate impulse noise are provided. A particular method includes providing a signal from a transmission source to a mitigator. The mitigator checks the signal for complex impulse noise comprising at least a first periodic impulse noise component correlated to a first portion of a sinusoid representing frequency of an alternating current power source associated with the transmission source and a second periodic impulse noise component correlated to a second portion of the sinusoid. The method further includes receiving noise mitigation instructions from the mitigator at the transmission source to compensate for the complex impulse noise.04-22-2010
20100246707SIGNAL TRANSMISSION SYSTEM - A method of operating a system (09-30-2010
20110069778METHOD AND SYSTEM FOR ADAPTIVE MODULATIONS AND SIGNAL FIELD FOR CLOSED LOOP MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM - A method for communicating information is disclosed and includes, in a multiple-input-multiple-output (MIMO) communication system utilizing a plurality of modulation types and a plurality of spatial streams, determining an aggregate noise characteristic based upon a noise characteristic of each of the plurality of spatial streams. A receiver may be configured to receive subsequent data based on one or both of: a current modulation type for modulating a current spatial stream and at least one subsequent modulation type for modulating at least one subsequent spatial stream. The current modulation type and the at least one subsequent modulation type may be based on the determined aggregate noise characteristic. A constellation field may be encoded to uniquely identify a combination comprising the current modulation type, and the at least one subsequent modulation type.03-24-2011
20110069777Radio Frequency Circuit - A digital-to-analog conversion circuit operates by selectively discharging members of a plurality of capacitors. Charging of the capacitors occurs during a reset period while digital-to-analog conversion occurs as the capacitors are discharged. Those capacitors that are discharged are selected from the plurality of capacitors based on a digital input. The analog output includes the charge discharged from the capacitors. The capacitors are optionally divided into separate capacitor banks.03-24-2011
20120201323Methods and Apparatuses For Data Transmission - In an embodiment, a communication device is provided comprising transmit circuitry and crosstalk reduction circuitry. In an embodiment, the crosstalk reduction circuitry is configured to receive crosstalk information indicative of crosstalk between a plurality of communication connections for only a part of communication channels of said communication connections.08-09-2012
20120201322SIGNAL MODULATION METHOD RESISTANT TO ECHO REFLECTIONS AND FREQUENCY OFFSETS - A method of modulating communications signals, such as optical fiber, wired electronic, or wireless signals in a manner that facilitates automatic correction for the signal distortion effects of echoes and frequency shifts, while still allowing high rates of data transmission. Data symbols intended for transmission are distributed into N×N matrices, and used to weigh or modulate a family of cyclically time shifted and cyclically frequency shifted waveforms. Although these waveforms may then be distorted during transmission, their basic cyclic time and frequency repeating structure facilitates use of improved receivers with deconvolution devices that can utilize the repeating patterns to correct for these distortions. The various waveforms may be sent in N time blocks at various time spacing and frequency spacing combinations in a manner that can allow interleaving of blocks from different transmitters. Applications to channel sounding/characterization, system optimization, and also radar are also discussed.08-09-2012
20110150121Systems and Methods of Resource Allocation for Cancellation of Crosstalk - A method implemented in a multi-user communication system is described for performing far-end crosstalk (FEXT) cancellation for each victim user. The method comprises performing dynamic programming to allocate resources according to (N−1) normalized disturber coupling values and difference rate function values associated with N total users in the system involved in partial FEXT cancellation. In accordance with some embodiments, dynamic programming comprises selecting a tone and one or more disturbers to be cancelled for the tone.06-23-2011
20100260282METHOD, DEVICE AND SYSTEM FOR MANAGING LINES - A method, a device, and a system for managing lines are provided. The method includes: collecting showtime parameters of user lines (10-14-2010
20110150122Method for a Single Radio Aggregated Spectrum Receiver, Computer Program, Receiver, and Terminal - A method for a single radio aggregated spectrum receiver of a terminal arranged to operate in a radio network is disclosed. The method comprises receiving information from a network node of the radio network about frequency properties of an aggregated spectrum to be received; determining information about the aggregated spectrum comprising at least one of presence of blocking interferer(s) interspersed with, and pass bands within the aggregated spectrum; and providing filter(s) based on the determined information about the aggregated spectrum such that desired signals are passed and any blocking interferer(s) are attenuated. Corresponding computer program, receiver and terminal are also disclosed.06-23-2011
20110255629METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the precoding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating precoding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined precoding scheme.10-20-2011
20110255627METHOD AND APPARATUS FOR CREST FACTOR REDUCTION IN TELECOMMUNICATIONS SYSTEMS - A method and device for reducing Peak-to-Average Power Ratio (PAPR) of a transmitted signal in a wireless telecommunication system utilizing CFR technique, the method including performing peak-windowed clipping of a transmitted signal using at least two cascaded clipping stages and individually configuring parameters for each clipping stage before performing the peak-windowed clipping.10-20-2011
20100322339REDUCTION OF INTERFERENCE IN AN OFDM SIGNAL WITH WEIGHTING VECTORS EVOLVING IN VECTOR SUBSPACES - To reduce interferences in signals received by a receiver through a propagation channel, each including symbols distributed according to frequency and time dimensions and corresponding to a common emitted signal, the receiver weights an estimate of the emitted signal and the received signals by weighting vectors evolving in vector subspaces representing time variations and frequency variations of the channels for propagating the signals between an emitter and the receiver. These vector subspaces are defined by matrices, some columns of which are suppressed as a function of frequency and time constraints of the channel. The receiver minimizes a function of the difference between the sum of weighted received signals and the weighted estimate of the emitted signal in order to estimate the emitted signal as a function of the weighting vectors and the received signals.12-23-2010
20080205544Method and Apparatus for Reducing the Interferences Between a Wideband Device and a Narrowband Device Interfering with the Wideband Device - The method includes an interference deduction mode for reducing interferences between a wideband device and a narrowband device. The method is performed within the wideband device and includes detecting an emission from and/or a reception performed by the narrowband device; determining from the detection step a group of at least one sub-carrier having frequencies interfering with the narrowband devices; and frequency shifting at least a part of frequency band of the wideband device including the group of at least one interfering sub-carriers with a chosen frequency shift such that at least a part of frequency band of the narrowband device is excluded from the frequency band of the wideband device.08-28-2008
20100329380METHOD FOR SELECTING ADAPTIVE FREQUENCY BASEBAND OF WALSH CODES, ADAPTIVE FREQUENCY-SELECTIVE SPREADER USING THE SAME AND TRANSMITTING AND RECEIVING APPARATUS USING THE ADAPTIVE FREQUENCY-SELECTIVE SPREADER - There is provided a human body communication method and system using a frequency-selective baseband in order to transmit and receive data between communication devices that are coupled to a human body by using the human body as a communication channel. The human body communication method and system may be useful to maximize an efficiency of the frequency-selective spreading technology to enhance a processing gain of the Walsh code technology, and thus to reduce the interference between human bodies of users by adaptively selecting a frequency band of Walsh codes that are used for data communications according to the human body channel characteristics and the noise environments that are varied according to the ambient environments, and also construct a low-power and stable human body communication when there is a strong interference induced from other electronic equipments.12-30-2010
20110080973COMMON MODE CANCELLATION IN DIFFERENTIAL NETWORKS - Embodiments of the invention include a common mode cancellation circuit and method for correcting signal skew in a differential circuit. According to one embodiment, an op amp circuit is used to correct the mismatch between transmission line lengths in the differential circuit. The CMCC can be embodied as an ASIC and added on to an existing differential signaling systems to correct and compensate for board wiring skew or other causes of phase misalignment. The result is restoration of the cross-over intersection of the plus and minus signals of the differential pair closer to the common voltage level point, as if the signals had been in phase.04-07-2011
20110135028IMPULSE RADIO COMMUNICATION DEVICE - An impulse radio communication device includes a short pulse generator configured to change a shape of an impulse to be output; a bandpass filter configured to receive the impulse and output the impulse as a wave packet; an amplifier configured to amplify an output from the bandpass filter; and an antenna configured to output the wave packet, output from the amplifier, as a wireless signal, the short pulse generator includes a control section configured to change the shape of the impulse to be output, in response to an environmental condition of a transmission path for wireless communication.06-09-2011
20120147984SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS - Methods and apparatus for enhancing estimations of channel response in a wireless communication system are discussed. As an example, a method can comprise: selecting a selected channel from among one or more channels in the communication system; determining, for the selected channel, an initial channel estimate comprising a sequence of frequency-domain samples; determining a phase slope of the initial channel estimate; generating a flat-phase channel estimate by removing the phase slope from the initial channel estimate; and generating an enhanced channel estimate for the selected channel by applying a smoothing function to the flat-phase channel estimate. Other aspects, embodiments, and features are also claimed and described.06-14-2012
20110255628Method And Apparatus For Interference Mitigation By Removing A Portion Of The Transmit Signal - Elimination of intermodulation interference in a wireless communication system by removing a portion of the spectrum of transmitted signals. According to a received indication of an occurrence of intermodulation interference experienced by a narrowband receiver, mappings are performed between the predetermined narrowband channel frequency on which the narrowband receiver operates and the occupied channel frequencies of at least one broadband transmit signal. Narrowband candidate frequency ranges that linearly combine into frequencies that overlap the predetermined narrowband channel frequency are determined based on the mappings. The narrowband candidate frequency ranges that potentially contribute to the intermodulation interference are then selectively filtered by at least one notch filter until the intermodulation interference is substantially eliminated.10-20-2011
20100158152METHOD OF PREVENTING FALSE DETECTIONS IN SENSORS - Described herein is a method of preventing false detections in sensors pulse-Doppler radar mounted on a moving platform. The method comprises filtering each received burst using Doppler filtering to split each received burst into at least a fast channel and one or more slow channels. The slow channel outputs are then used to derive compensation values for the fast channel. In particular, a zero Doppler slow channel is used to derive predicted surface clutter residue information, and a near zero Doppler slow channel is used to derive additional false alarm control attenuation information. Both the predicted surface clutter residue and the false alarm control attenuation information is used to apply compensation to the fast channel and a comparison is done to select the lower of the two values to generate an output signal.06-24-2010
20100195755BIT ALOCATION AMONG CARRIERS IN MULTICARRIER COMMUNICATIONS - A technique is provided that may be employed in multicarrier communications to improve the efficiency of error correction using symbol-oriented error correction methodologies, by reducing the number of error correction code symbols (08-05-2010
20100067609System, transmitting apparatus and receiving apparatus for cancelling co-channel interferences and method thereof - The present invention discloses a system and method for cancelling co-channel interferences, including: grouping, interleaving and repeating initial data blocks to generate logical data blocks, permutating the logical data blocks to generate physical data blocks, and transmitting the physical data blocks; receiving, de-permutating and de-interleaving the physical data blocks to generate interleaved logical data blocks, separating and estimating physical channels of an objective base station and neighboring base stations according to preamble symbols or pilot symbols, de-permutating and de-interleaving estimated physical channels to generate estimated logical channels, constructing estimated logical channel matrixes by using the estimated logical channels, computing weighted coefficients according to the estimated logical channel matrixes, equalizing the interleaved logical data blocks by using the weighted coefficients to generate equalized logical data blocks, recovering the equalized logical data blocks to generate the initial data blocks. The co-channel interferences are eliminated and the reliability of the communication system is improved according to the present invention.03-18-2010
20110051837COMMUNICATION SYSTEM PERFORMING INTERFERENCE ALIGNMENT AND INTERFERENCE ALIGNMENT METHOD - A communication device and a mobile station to perform interference alignment, and an interference alignment method are provided. Interference alignment may be performed to enable an interference signal, received in a mobile station, to be removed using channel information fed back from the mobile station.03-03-2011
20100027707Transmitting Apparatus, Signal Processing Method and Communication System - A transmitting apparatus is provided which includes a signal processing unit to perform signal processing of transmission data and an antenna to transmit transmission data processed by the signal processing unit, and the signal processing unit includes a digital filter to extract a signal component in a given frequency band and correct an aperture effect occurring during the signal processing.02-04-2010
20120147985FEEDBACKING CHANNEL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to feedback channel information in wireless communication system.06-14-2012
20100177839METHOD OF DIRTY PAPER CODING USING NESTED LATTICE CODES - A method of Dirty Paper Coding DPC using nested lattices is disclosed. The complexity of DPC can be reduced by scaling nested lattices and mapping interference to a lattice point of the scaled lattice.07-15-2010
20110305293COGNITIVE INTER-CELL INTERFERENCE CONTROL METHOD AND APPARATUS - Provided is a cognitive inter-cell interference control method and apparatus. Inter-cell interference may be measured based on various methods in order to recognize an interference channel, and an appropriate interference control algorithm may be applied to the interference channel by modeling based on overhead. Accordingly, interference may be controlled.12-15-2011
20120099669DIRTY PAPER CODING AND REFERENCE SIGNAL DESIGN - A method of wireless communication includes receiving a signal comprising an encoded downlink reference signal (DL-RS) modified by an effective channel. The encoded DL-RS is encoded based on crosstalk interference. The method further includes estimating the effective channel.04-26-2012
20080279302CONTACTLESS TRANSMISSION OF ELECTRICAL SIGNALS BETWEEN TWO UNITS - The invention discloses an arrangement and an associated method for contactless transmission of electrical signals between two units 11-13-2008
20110013714TRANSMITTING DEVICE, RECEIVING DEVICE, AND SIGNAL PROCESSING METHOD IN RADIO COMMUNICATION SYSTEM - A signal frequency of an interface signal between a baseband unit and a remote radio unit is decreased by downsampling, and the strain of the signal caused by downsampling is compensated for each subcarrier before an IFFT during transmission, and after FFT during reception.01-20-2011
20110158343METHOD AND APPARATUS FOR ESTIMATING CHANNEL USING PHASE COMPENSATION IN WIRELESS COMMUNICATION SYSTEM - Method of estimating a channel in a wireless communication system by obtaining a channel impulse response from a pilot signal included in a received signal; estimating a timing offset with a maximum peak power value for the channel impulse response; and performing a phase compensation using the estimated timing offset and estimating a channel which is applied with the compensated phase.06-30-2011
20110158342TIME TRACKING FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX - Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may perform time tracking and determine an FFT window position based on a metric related to inter-symbol interference (ISI) and inter-carrier interference (ICI). The receiver may determine an early energy for signal paths earlier than the current FFT window position, determine a late energy for signal paths later than the current FFT window position, determine the metric based on the early and late energies, compute an update amount for the FFT window position based on the metric, and update the FFT window position based on the update amount with a time tracking loop (TTL). In yet another aspect, the receiver may compute the FFT window position based on a channel impulse response (CIR) estimate directly, without using a TTL.06-30-2011
20110090982METHODS AND APPARATUS FOR DYNAMIC WIRELESS DEVICE COEXISTENCE - Methods and apparatus for dynamically compensating for the effects of interference between multiple wireless communications 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 in the same first band (or proximate to the first band and with a comparatively high transmitter power), where the second wireless communication apparatus operates according to a different communication protocol than the first wireless communication apparatus and further change in physical configuration with respect to one another. Based on the physical configuration, interference is compensated for between the first wireless communication apparatus and the second wireless communication apparatus “on the fly” by selecting and operating according to one of a plurality of operational protocols.04-21-2011
20120207239Orthogonal Pilot Code Construction - A method, system and apparatus for communication in an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes allocating a plurality of sequences to a plurality of sectors in the OFDMA communication system. The plurality of sequences are orthogonal to each other. The method further includes communicating one or more OFDM tiles between one or more MSs in one or more sectors of the plurality of sectors and one or more BSs of the one or more sectors. The one or more OFDM tiles include one or more sequences of the plurality of sequences allocated to the one or more sectors.08-16-2012
20120002745SYSTEM AND METHOD FOR THE COOPERATION AMONG BASE STATIONS - The present invention relates to a system and to a method for the cooperation among base stations, in which a communication service is provided to a plurality of communication terminals through the plurality of base stations. When channel state information of a communication terminal is acquired, a serving base station selects a serving channel code matching the channel state information from a codebook, calculates linear transform information using the serving channel code and the channel state information, and transmits the serving channel code to a cooperative base station. When the cooperative base station receives a cooperation channel code, the serving base station calculates serving weight information of the serving base station and cooperation weight information of the cooperative base station using the serving channel code and the cooperation channel code, and determines a beam forming vector by applying the linear transform information to the serving weight information. According to the present invention, the channel state information is linearly transformed before the base station transforms the channel state information into the channel code, to thereby predict a quantization loss between the channel state information and the channel code in the system for the cooperation among base stations. In addition, the base station may recover the quantization loss when communication service is provided in the system for the cooperation among base stations. This leads to improved cooperation performance among base stations in the system for the cooperation among base stations.01-05-2012
20120045010RECEIVER, METHOD FOR CANCELLING INTERFERENCE THEREOF AND TRANSMITTER FOR THE SAME - Provided is a method for eliminating an interference operating on a receiver of a transmitter in a communications system, which includes transmitting at least one user signal; changing user phase information to be separated from interference phase information by a preset difference, when receiving the user phase information of the user signal and the interference phase information of an interference signal from at least one receiver; and transmitting at least one other user signal according to the changed user phase information.02-23-2012
20120045011METHOD FOR SETTING CYCLIC SHIFT CONSIDERING FREQUENCY OFFSET - A method for establishing a cyclic shift sequence to provide against the frequency offset is disclosed. The method calculates a distance between a channel response position of the sequence and an alias channel response position caused by a frequency offset, calculates the number of cyclic shifts per group according to the calculated distance, and establishes the cyclic shift (CS)-applying interval. This method easily establishes a cyclic shift (CS) interval at a specific location having no overlapping by considering a channel response of a reception (Rx) sequence and an alias location of this reception (Rx) sequence, although a reception (Rx) signal is shifted by a channel delay spreading or a propagation delay irrespective of categories of a domain generating a sequence, so that it can greatly reduce the number of the detection errors and the false alarm rate. And, if a sequence of the cyclic shift (CS) is allocated to a cell having a frequency offset of more than a predetermined level, the present invention can minimize the influence of a frequency offset on a high-mobility cell.02-23-2012
20120008705APPARATUS AND METHOD FOR COMPENSATING FOR IQ MISMATCH IN MOBILE COMMUNICATION SYSTEM - An apparatus and a method for increasing Error Vector Magnitude (EVM) performance representing quality of transmission signal are provided. The apparatus and the method suppress an image frequency component generated due to mismatch of IQ channels in order to transmit/receive a large amount of data without distortion in 401-12-2012
20120008704Approach for Enabling Coexistence for Radio Technologies - Embodiments disclosed herein relate to wireless communications, and more particularly to reducing interference in wireless communications. The principal object of this invention is to co-ordinate between two or more communication radios, present within the same device or a plurality of devices present close to each other, without interfering with other non-interfering devices. Embodiments disclosed herein disclose a scheme for reducing interference between any licensed and/or unlicensed radio.01-12-2012
20120014472METHOD, APPARATUS, AND SYSTEM FOR MICROWAVE SIGNAL CORRECTION - A method, an apparatus, and a system are provided in various embodiments of the present invention. According to embodiments of the present invention, the receiver samples the frequency signal from the transmitter to obtain sampling data and obtain the feedback IQ signal from the sampling data, and performs signal correction by using the feedback IQ signal. Sampling the received radio frequency signal does not need an additional component. The receiving channel installed in the receiver can be used to receive the radio frequency signal, which reduces the cost and power consumption.01-19-2012
20120014471METHODS AND APPARATUS FOR MINIMIZING INTER-SYMBOL INTERFERENCE IN A PEER-TO-PEER NETWORK BACKGROUND - The methods and apparatus described herein are used to operate a wireless device. One method of operating a wireless device includes filtering a first set of digital samples using a first filter at a first time to generate a first signal, transmitting the first signal, filtering a second set of digital samples using a second filter at a second time to generate a second signal, and transmitting the second signal. In one embodiment, an apparatus for operating a wireless device includes a processor configured to filter, at a first wireless device, a first set of digital samples using a first filter at a first time to generate a first signal, transmit, from the first wireless device, the first signal, and filter, at the first wireless device, a second set of digital samples using a second filter at a second time to generate a second signal.01-19-2012
20120027118FAR-END CROSSTALK CANCELING METHOD AND DEVICE, AND SIGNAL PROCESSING SYSTEM - A method for remote crosstalk cancellation, includes: the combination transmitting signal is performed a pre-coding of crosstalk cancellation in the manner of self-adapting filtering, the self-adapting changes of the values of filtering parameters are guided correctly with the influence of the crosstalk component in the received signals which is reflected indirectly by relevant values of the noise statistic reported by the receiver. A corresponding device and a signal processing system for remote crosstalk cancellation are provided. The self-adapting adjustment of the values of filtering parameters has a favorable astringency and an effect for crosstalk cancellation, avoiding the need to know the channel transmission matrix in advance, while absolutely avoiding the conflict to the existing transmission standard.02-02-2012
20120027117LINK LAYER MULTICASTING SYSTEMS AND METHODS - Beamforming systems and methods are disclosed. In accordance with one method, indications of channel matrices for a plurality of receivers are obtained. Further, a beamformer matrix is formulated as a linear combination of columns of hermitians of the channel matrices. In addition, coefficients of the hermitians in the linear combination are determined to compute the beamformer matrix such that a lowest reception rate among reception rates of each of the receivers is maximized. Data signals are transmitted to the receivers by applying the computed beamformer matrix to data symbols to maximize the lowest reception rate.02-02-2012
20120207240METHOD AND SYSTEM FOR ACQUIRING CHANNEL STATE INFORMATION - A method for acquiring channel state information is disclosed in the present invention, including: a user equipment (UE) reporting codebook index information and information about the total number of layers to a base station (eNB), wherein the codebook index information includes one of the following information: class 2 codebook index l; and class 1 codebook index i and index parameter j; and after receiving the codebook index information and information about the total number of layers sent by the UE, the base station obtaining a codeword in the manner of inquiring of a preset codebook list or in the manner of inquiring of the preset codebook list in conjunction with calculation according to the codebook index information and information about the total number of layers. A system for acquiring channel state information is also disclosed in the present invention.08-16-2012
20120155564System and Method for Extraction of Communication Interference - A method for the extraction of communication interference, may include converting a digital baseband signal into an analog signal, transmitting the analog signal; receiving the analog signal, converting the analog signal after receipt into a received digital signal, modulating the digital baseband signal to generate a reference signal, estimating a delay between the received digital signal and the reference signal, generating an aligned reference signal based on the reference signal and the delay, estimating a transmission gain of the received digital signal based on the received digital signal and the aligned reference signal, multiplying the aligned reference signal by the transmission gain to generate a scaled reference signal, and subtracting the scaled reference signal from the received digital signal to generate an estimated interference present in the received digital signal.06-21-2012
20110103507SYSTEM AND METHOD FOR COMBINED PREDISTORTION AND INTERFERENCE CANCELLATION IN A SATELLITE COMMUNICATIONS SYSTEM - The present invention provides a communication system for use with a first source signal and a second source signal. The first source signal is on a first channel and includes M symbols, where M is an integer greater than 1. The second source signal is on a second channel and includes X symbols, where X is an integer greater than 1. The first channel is different from the second channel. The communication system includes a first modulator unit, a second modulator unit and an adder. The first modulator unit can generate a first modulated signal based on the first source signal and includes a first inter-symbol distortion estimating unit and a first stage predistortion unit. The second modulator unit can generate a second modulated signal based on the second source signal and includes a second inter-symbol distortion estimating unit and a predistortion unit. The adder can generate an added signal based on the first modulated signal and the second modulated signal. The first inter-symbol distortion estimating unit can generate a distorted symbol vector based on an estimate of a distortion of the first through (a−1)-th symbols and an estimate of a distortion of the (a+1)-th through M-th symbols, where 1≦a≦M. The first stage predistortion unit is operable to generate a predistorted symbol ã based on the symbol a of the first plurality of symbols and the distorted symbol vector. Further, a receiver unit can cancel interference in the received signals to account for adjacent channel interference.05-05-2011
20120121033METHOD AND DEVICE FOR DECODING OF SIGNALS TRANSMITTED OVER FADING CHANNELS WITH MULTIPLICATIVE NOISE - A method of generating a reliability indicator for decoding an encoded signal transmitted from a transmitter to a receiver via a wireless channel subject to fading. The method comprises: receiving symbols of the encoded signal; generating a reliability indicator for decoding at least some of the symbols selectively based on one or both of a statistical model representing additive white Gaussian noise (AWGN) in the encoded signal and a statistical model representing fading of the encoded signal; and selecting the statistical model based on signal characteristics of the wireless channel.05-17-2012
20100067608ENHANCED COUNTERMEASURES FOR ALL-DIGITAL LINE-OF-SIGHT (LOS) PROCESSOR - An all-digital line-of-sight (LOS) process architecture addresses the size, weight, power and performance constraints of a receiver for use in semi-active or active pulsed electromagnetic (EM) targeting systems. The all-digital architecture provides a platform for enhanced techniques for sensitive pulse detection over a wide field-of-view, adaptive pulse detection, LOS processing and counter measures.03-18-2010
20120314794Transceiver self-diagnostics for electromagnetic interference (EMI) degradation in balanced channels - Transceiver self-diagnostics for electromagnetic interference (EMI) degradation in balanced channels. Selective operation of transmitting a common mode signal from a communication link implemented for supporting differential signaling, and appropriate processing of any detected signal energy, such as that corresponding to differential signal energy, provides a measure of electromagnetic compatibility (EMC) corresponding to the communication link. Comparison of detected differential signal energy to one or more thresholds may provide indication of whether or not the communication link is balanced or unbalanced, a degree or margin with which the communication link is compliant in accordance with EMC in accordance with one or more protocols, standards, or recommended practices. Multiple successive measurements of detected differential signal energy may be used to determine a trend of performance, such as whether or not the communication link is trending toward imbalance, failure, or noncompliance.12-13-2012
20120213307Rateless and Rated Coding Using Spinal Codes - In one aspect, a wireless system includes an encoder configured to encode data using a spinal code which uses a function over the message bits to directly produce a sequence of constellation symbols for transmission. The wireless system also includes a decoder configured to decode the spinal code. The function may be at least one of a non-linear function and a hash function.08-23-2012
20120163491Method and Apparatus for Vectored Data Communication - In an embodiment, vector training signals are received. Noise affecting the training signals is evaluated, and a noise indication is thus determined.06-28-2012
20120213306APPARATUS AND METHOD FOR CROSS CLOCK DOMAIN INTERFERENCE CANCELLATION - An apparatus and method for cross clock domain interference cancellation is provided to a communication system which includes a transmitter operated in a first clock domain and a receiver operated in a second clock domain. The apparatus comprises a First-In-First-Out (FIFO) circuit and a cancellation signal generator. The FIFO circuit receives a digital transmission signal of the transmitter in the first clock domain, and outputs the digital transmission signal in the second clock domain according to an accumulated timing difference between the first and second clock domains. The cancellation signal generator generates a cancellation signal for canceling an interference signal received by the receiver according to the digital transmission signal outputted by the FIFO circuit. The interference signal is generated in response to the digital transmission signal. The cancellation signal generator adjusts the cancellation signal according to a phase difference between the interference signal and the cancellation signal.08-23-2012
20120328041DEVICES OF IQ MISMATCH CALIBRATION, AND METHODS THEREOF - The device with IQ mismatch compensation includes a transmitter oscillator, a transmitter module, and a loop-back module. The transmitter module is arranged to up-convert a transmitter signal with the oscillator signal to generate an RF signal. The loop-back module is arranged to down-convert the RF signal with the oscillator signal to determine a transmitter IQ mismatch parameter, and effects of IQ mismatch of the loop-back module are calibrated by inputting a test signal and the oscillator signal before the down-converting of the RF signal. The transmitter module is arranged to reduce effects of IQ mismatch of a transmitter path in the transmitter module according to the transmitter IQ mismatch parameter.12-27-2012
20120328042METHOD AND APPARATUS FOR TRANSMITTING SIGNAL USING REPETITION CODING IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting information data using a repetition coding scheme in a wireless communication system are disclosed. The transmission method includes generating a codeword of a predetermined size N12-27-2012
20120082258CHANNEL ESTIMATION UTILIZING CONTROL SIGNALS TRANSMITTED BY AN ACTIVATING LINE DURING INITIALIZATION - An access node of a communication system is configured to control crosstalk between an activating channel associated with a first network terminal of a communication system and active channels associated with respective other network terminals of the system. The access node detects a control signal sent by the first network terminal over the activating channel in a designated phase of an initialization process of the first network terminal, determines an error signal from the detected control signal, correlates the error signal with one or more corresponding signals sent by respective ones of the other network terminals over the active channels, estimates crosstalk from the active channels into the activating channel based on the correlation, and configures a vectoring signal processing module to control the estimated crosstalk. The control signal sent by the first network terminal comprises a value that is selected by the first network terminal from a set of two or more values and prior to its detection the particular selected value is unknown to the access node.04-05-2012
20120263253RADIO FREQUENCY CIRCUIT - A digital-to-analog conversion circuit operates by selectively discharging members of a plurality of capacitors. Charging of the capacitors occurs during a reset period while digital-to-analog conversion occurs as the capacitors are discharged. Those capacitors that are discharged are selected from the plurality of capacitors based on a digital input. The analog output includes the charge discharged from the capacitors. The capacitors are optionally divided into separate capacitor banks.10-18-2012
20110235737ISOLATED COMMUNICATION SYSTEM - A transmission unit includes a transmission pulse signal generating circuit which generates a transmission pulse signal having pulses corresponding to a plurality of clock signals generated in a clock signal generating circuit, existing between a first pulse and a second pulse which are generated in an edge pulse generating circuit. A receiving unit is configured to decode a received pulse signal based on the transmission pulse signal received from the transmission unit via an isolated communication unit, as a signal that transitions from a first level to a second level when an initial pulse of the received pulse signal is detected and that transitions from the second level to the first level when a subsequent pulse is not detected within a predetermined first time period from when a most recent pulse of the received pulse signal is detected.09-29-2011
20120321012Providing Phase Diversity Combining Of Digital Radio Broadcast Signals - In one embodiment, a method for performing antenna diversity combining for digitally broadcast radio signals includes generating a first signal quality metric for a first signal obtained from an incoming digitally broadcast radio signal received in a first signal path, and similarly generating a second signal quality metric for a second signal obtained from the radio signal received in a second signal path. Then the first and second signals from these paths can be coherently combined based on the signal quality metrics to obtain a combined frequency domain symbol. In some embodiments, this combined frequency domain symbol may be remodulated to a time domain symbol. Also in some embodiments N tuners can be daisy chained to generate a final output that is either a frequency domain symbol of combined sub-carriers, soft bits to a forward error correction (FEC) decoder, or a remodulated time domain symbol. As a further possibility, each of the N tuners can use a different local oscillator (LO) frequency.12-20-2012
20100232539Method and apparatus for transmitting control information for interference mitigation in multiple antenna system - A multiple antenna system including a mobile station and a base station are operable to perform a method for transmitting control information for interference mitigation. A Mobile Station (MS) can transmit control information for interference mitigation. The MS determines a first Precoding Matrix Index (PMI) and a second PMI for interference from an adjacent Base Station (BS). Based on a correlation level from correlation values between one of the first PMI and second PMI and the remaining PMIs in the codebook, the MS determines a level of a subset of PMIs, and feeds back information indicating the correlation level.09-16-2010
20120087435ENHANCED CHANNEL FEEDBACK FOR MULTI-USER MIMO - A method includes receiving in a mobile communication terminal over a communication channel a Multiple-Input Multiple-Output (MIMO) signal that includes at least a transmission addressed to the terminal. A Multi-User Signal to Noise Ratio (MU-SNR) is estimated in the terminal based on the received signal. The MU-SNR is indicative of a power ratio between the transmission addressed to the terminal and remaining components of the signal, which are assumed to include one or more transmissions addressed to one or more other terminals. Feedback, which is indicative of the communication channel and is based on the MU-SNR, is transmitted from the terminal.04-12-2012
20100202554SIMULTANEOUS ESTIMATION OF MULTIPLE CHANNEL COEFFICIENTS USING A COMMON PROBING SEQUENCE - An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals generated based on respective ones of a plurality of different frequency expansions. For example, each of the distinct probing signals may be generated based on a distinct combination of a common probing sequence and a selected one of the plurality of different frequency expansions.08-12-2010
20130022147COHERENT DETECTION USING COHERENT DECODING AND INTERLEAVING - A system is configured to receive a block of symbols, associated with a phase-modulated signal that includes data symbols that correspond to a payload associated with the signal, and control symbols; process the control symbols to identify an amount of phase noise associated with the control symbols; reset a phase, associated with each of the data symbols, based on the amount of phase noise and a reference phase; interleave the respective data samples, of each of the data symbols with other data samples, where the interleaved respective data samples cause errors, associated with the respective data samples, to be spread out among the other data samples and reduces an error rate relative to a prior data rate that existed before the interleaving; and perform forward error correction on the interleaved respective data samples.01-24-2013
20100086076CODES AND PREAMBLES FOR SINGLE CARRIER AND OFDM TRANSMISSIONS - Certain aspects of the present disclosure relate to a method for generating a frame structure suitable for use in both single carrier (SC) and Orthogonal Frequency Division Multiplexing (OFDM) transmission modes, while ensuring accurate channel estimation at a receiver.04-08-2010
20080225979Group MMSE-DFD with Rate (SINR) Feedback and Pre-Determined Decoding Order for Reception on a Cellular Downlink - A method for decoding and rate assignment in a wireless channel, where all dominant transmitter sources use inner codes from a particular set, comprising the steps of: i) estimating channel matrices seen from all dominant transmitter sources in response to a pilot or preamble signal transmitted by each such source; ii) converting each estimated channel matrix into an effective channel matrix responsive to the inner code of the corresponding transmitter source; iii) obtaining the received observations in a linear equivalent form (linear model) whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitter source inherits the structure of its inner code; iv) processing the transmitter sources according to the specified (or pre-determined) order of decoding; v) for each transmitter source, assuming perfect cancellation of signals of preceding transmitter sources; vi) computing a signal-to-interference-noise-ratio SINR responsive to the effective channel matrix of the transmitter source and the covariance matrix of the noise plus signals from remaining transmitter sources; and vii) feeding back all computed SINRs to respective transmitter sources.09-18-2008
20110261897MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION THEREOF FOR REDUCING THE QUANTIZATION EFFECT OF PRECODING OPERATIONS UTILIZING FINITE CODEBOOKS - A method for reducing the quantization effect of precoding operations utilizing a finite codebook in MIMO systems is provided. First, at the receiver side, downlink channel state information is obtained and a set of indices of precoding matrices within a plurality of finite codebooks are selected accordingly. The selected indices of precoding matrices for each of the finite codebooks and a set of scalar coefficients are transmitted from the receiver to the transmitter. Thereafter, at the transmitter side, at least a first and a second refined precoding matrices are generated based on the selected set of indices of precoding matrices for all of the finite codebooks, and the one or more scalar coefficients and a final precoding matrix is generated at least based on the first refined precoding matrix and the second refined precoding matrix. The final precoding matrix is applied for transmission between the transmitter and the receiver.10-27-2011
20130170575SERIAL DATA COMMUNICATION METHOD AND SERIAL DATA COMMUNICATION DEVICE - A master device and slave devices are connected with each other through an SDA and an SCL, and at least one of a serial communication data signal communicated through the SDA and a serial communication clock signal communicated through the SCL is latched with use of a noise removal clock signal whose frequency is higher than that of the serial communication clock signal, and is taken in.07-04-2013
20130142273Adaptive Path Selection for Interference Cancellation - Disclosed are various embodiments providing adaptive path selection for interference cancellation for wireless communication devices. Signal strength metrics are obtained for each of multiple signal paths. One or more of the signal paths are selected as cancellation candidates in response to determining that the signal paths are associated with a strong interfering path based at least in part on the signal strength metrics for the signal paths and threshold criteria. Cancellation is enabled for an estimated signal generated using the signal paths in response to the signal paths being selected as cancellation candidates.06-06-2013
20130177099Common-mode termination within communication systems - Common-mode termination within communication systems. Termination is implemented with respect to two respective portions of a system: the intentional signaling within a communication system as well as any unintentional signaling which may be coupled into the system. Such unintentional signaling may be incurred in a variety of ways including via interference which may be generated by the system itself or by other devices or components external to the system. In addition, such unintentional signaling made be characterized as common-mode (CM) signaling, in that, it generally affects different respective portions of the system similarly or in the same manner. Various communication systems may include two or more devices implemented therein, that effectuate signaling via one or more communication links there between. Appropriate termination is made with respect to both the intentional and unintentional signaling portion of the system using any of a variety of impedance types (e.g., resistors, capacitors, inductors, etc.).07-11-2013
20100046660INTERFERENCE CANCELLATION UNDER NON-STATIONARY CONDITIONS - A method for timing and frequency synchronization in a wireless system is provided. The method comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols, iteratively adjusting the subset of the burst of symbols by a plurality of timing offsets and calculating, for each timing offset, a first performance metric corresponding to the adjusted subset. The method further comprises the steps of determining one of the plurality of timing offsets to be a preferred timing offset based upon the first performance metric thereof, iteratively rotating the subset of the burst of symbols by a plurality of frequency offsets and calculating, for each frequency offset, a second performance metric corresponding to the rotated subset, and determining one of the plurality of frequency offsets to be a preferred frequency offset based upon the second performance metric thereof.02-25-2010
20080219376Methods and arrangements for communicating in a multiple input multiple output system - Systems and methods for utilizing new communication standards in wireless local area networks are provided that also support legacy wireless stations. The method can include user equipment determining channel state information, selecting a unitary channel decomposition precoder format based on the determined channel state information and transmitting the precoder format information to a base station. During a return transmission the user equipment can receive user data with the precoder format information and utilize a non-linear detector to demodulate and decode the user data. Based on the reception the user equipment can estimate channel quality; and transmitting channel quality information as feedback.09-11-2008
20120250780METHOD AND DEVICE FOR PRE-CODING, AND METHOD AND DEVICE FOR DECODING - The present invention relates to the field of wireless communications technologies, and discloses a method and device for pre-coding and a method and device for decoding. The present invention implements an interference alignment method with excellent performance, can effectively increase the capacity of a multi-user interference system and reduce the mutual interference among users, The method for pre-coding includes: calculating a pre-coding matrix for each transmitting end according to a sum of mean square errors of data vectors to be transmitted by each transmitting ends; and using the pre-coding matrix to pre-code the data to be transmitted by each transmitting end. The present invention has broad application prospects, for example, can be used in LTE and LTE-Advanced CoMP technology.10-04-2012
20130101063DFT-BASED CHANNEL ESTIMATION SYSTEMS AND METHODS - DFT-based channel estimation methods and systems are disclosed. One system includes an inverse discrete Fourier transform module, a noise power estimator, a noise filter and a discrete Fourier transform module. The inverse discrete Fourier transform module is configured to determine time domain estimates by applying an inverse discrete Fourier transform to initial channel estimates computed from pilot signals. Additionally, the noise power estimator is configured to estimate noise power by determining and utilizing time domain samples that are within a vicinity of sinc nulls of the time domain estimates. The noise filter is configured to filter noise from the time domain estimates based on the estimated noise power to obtain noise filtered time domain estimates. Further, the discrete Fourier transform module is configured to perform a discrete Fourier transform on the noise filtered time domain estimates to obtain frequency domain channel estimates for channels on which pilot signals are transmitted.04-25-2013
20130101061Method for Transmitting Data Between a Radio Transmitting Device and a Radio Receiving Device - A method for transmitting data between a radio transmitting device and a radio receiving device includes transmitting a frame structure over a radio channel, the frame structure including a control channel and a data channel. The method further includes detecting a quality degradation of the radio channel, selecting a bit from the data channel and increasing a transmission power of the selected bit when the quality degradation of the radio channel is detected.04-25-2013
20130101062Interference Cancelling Block Modulation - Embodiments herein disclose an Interference Cancelling Block Modulation (ICBM), a new open-loop precoding scheme where each transmitter is assigned with a predetermined precoder which facilitates interference cancellation at the receivers. Only a finite set of precoders will be used, and they will be assigned to each transmitter in a pre-determined manner. Usually, interfering transmitters located adjacent to each other will have different precoders, and the same precoder can be reused by non-adjacent transmitters. The precoders are represented by N×K matrices and they expand the symbols in time and/or frequency by a factor of N/K while providing precoded sequences with low cross-correlation properties.04-25-2013
20130121435Crosstalk Management For OFDM Communication System In Power Efficient Transmission Mode - In the present disclosure, several techniques are proposed to estimate the worst-case crosstalk noise and use it for bit-loading and SRA calculations so that fluctuating crosstalk when PET mode is enabled does not lead to system instability. One of the proposed techniques involves strategically placing some marker tones in the transmitters of the affecting lines. The noise floor may be inferred by interpolating the noise observed on these marker tones (tones that are always-on) and applying to the entire frequency band on the victim line. Another proposed technique involves periodically transmitting a set of marker symbols (fully loaded OFDM symbols), so that a victim channel can estimate the SNRs in a worst case crosstalk scenario.05-16-2013
20130121434System for Distributed Interference Alignment - A system and method for realizing distributed interference alignment is disclosed. The system comprises a retrieving module, a determination module and a precoding module. The retrieving module retrieves source data. The determination module generates data describing one or more requirements for one or more associated Interference Alignment (IA) groups. The precoding module calculates a precoding vector based at least in part on the data describing the one or more requirements for the one or more associated IA groups. The precoding module is communicatively coupled to the retrieving module to receive the source data. The precoding module generates a transmission signal based at least in part on the precoding vector and the source data.05-16-2013
20130129004DATA MODULATION AND DEMODULATION METHOD, SPECTRUM MANAGEMENT METHOD, APPARATUS AND SYSTEM - A data modulation method, a data demodulation method, and a method, include obtaining a target frequency band allocated to a transmitting terminal; calculating a precoding codeword index of spectrum shaping according to a codebook corresponding to a current radio scene and the target frequency band, where the codeword index corresponds to a return-to-zero subcarrier sequence, and the return-to-zero subcarrier sequence serves to calculate a precoding vector for modulating data; and sending the precoding codeword index out through broadcast.05-23-2013
20110211649Methods and Systems for Noise and Interference Cancellation - Signals propagating from an aggressor communication channel can cause detrimental interference in a victim communication channel. One or more noise cancellers can generate an interference compensation signal to suppress or cancel the interference based on one or more settings. A controller can execute algorithms to find preferred settings for the noise canceller(s). The controller can use a feedback signal (e.g., receive signal quality indicator) received from a victim receiver during the execution of the algorithm(s) to find the preferred settings. One exemplary algorithm includes sequentially evaluating the feedback resulting from a predetermined list of settings. Another algorithm includes determining whether to move from one setting to the next based on the feedback values for both settings. Yet another algorithm includes evaluating a number of sample settings to determine which of the sample settings result in a better feedback value and searching around that sample setting for a preferred setting.09-01-2011
20100316158ACTIVE SIGNAL PROCESSING PERSONAL HEALTH SIGNAL RECEIVERS - The invention provides a receiver associated with a body, e.g., located inside or within close proximity to a body, configured to receive and decode a signal from an in vivo transmitter which located inside the body. Signal receivers of the invention provide for accurate signal decoding of a low-level signal, even in the presence of significant noise, using a small-scale chip, e.g., where the chip consumes very low power. Also provided are systems that include the receivers, as well as methods of using the same.12-16-2010
20120281782COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND COMMUNICATION INTEGRATED CIRCUIT - A communication system includes a first communication apparatus and a second communication apparatus. The first communication apparatus generates and transmits communication data in accordance with a predetermined protocol. The second communication apparatus includes a power circuit section having a switching regulator, and is configured to receive the communication data transmitted from the first communication apparatus. The predetermined protocol includes a protocol defining that at least one portion of a bit sequence constituting the communication data should be associated with an operation of the switching regulator. The second communication apparatus causes the switching regulator to operate in a time period in which the at least one portion of the communication data is received, in a state where the communication data is received.11-08-2012
20130182790INTERFERENCE MITIGATION TECHNIQUES FOR AIR TO GROUND SYSTEMS - A method for air to ground communication interference mitigation within an aircraft equipped with a multi-beam array antenna includes adjusting a modulation symbol interleaving and/or forward error correction of an aircraft receiver interface in response to detected interference from an interferer. The method further includes reducing a data rate of the aircraft receiver interface when the adjusting of the modulation symbol interleaving and/or forward error correction does not mitigate the detected interference. Another method for interference mitigation may include performing antenna beam-steering away from a geographic (GEO) arc during an aircraft turn. This method further includes reducing an aircraft transmitter transmit power when a signal quality of a forward link is within a predetermined range of a signal quality threshold.07-18-2013
20120020427INTERPOLATED CHANNEL ESTIMATION FOR MOBILE OFDM SYSTEMS - In an OFDM system using pilot cells for channel estimation, time interpolation among pilot cells of different OFDM symbols is commonly used to improve the estimate. The estimated channel impulse response is also windowed to further reduce noise and disturbances. However, for a transmission over a time-varying channel, suboptimal time interpolation, implemented with a filter having only a few taps not matched to the maximum Doppler frequency, degrades channel estimation. As aliases can lead to an erroneous estimate of channel duration and consequent errors in windowing, the present invention implements a technique to detect aliases and correct the estimate of channel duration. Parameters of the detection techniques are optimized by an analysis that provides closed-form expressions of the false alarm and miss detection probabilities.01-26-2012
20120020426TRANSMIT FORMAT SELECTION WITH CONSIDERATION FOR RESOURCE REUSE - Techniques for selecting transmit formats in a manner to account for the degrees of resource reuse for multiple data streams sent simultaneously from multiple antennas are described. The degree of resource reuse for each data stream indicates the amount of reuse of resources (e.g., orthogonal codes or subcarriers) observed by that stream. Interference estimates for the multiple data streams are derived based on an initial resource assignment. The degrees of resource reuse are determined based on the interference estimates and are used to derive at least one correction factor. At least one transmit format is then selected for the data streams using the at least one correction factor. Each data stream is associated with a transmit format that indicates the amount of resources to use for the data stream and other parameters. Resources are assigned to each data stream in accordance with its transmit format.01-26-2012
20120093253POWER ALLOCATION METHOD FOR WIRELESS COMMUNICATION SYSTEM, APPARATUS FOR SAME, AND TRANSCEIVER DEVICE USING THIS FORM OF SIGNAL TRANSMISSION - Disclosed is a wireless communication system and a power allocation in the wireless communication system.04-19-2012

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