Patent application number | Description | Published |
20090147880 | METHOD FOR REDUCING FEEDBACK INFORMATION OVERHEAD IN PRECODED MIMO-OFDM SYSTEMS - An improved method for reducing an amount of precoding feedback information in a multi-carrier Multiple-Input Multiple-Output (MIMO) communication system using precoding is disclosed. At the receiving end, the method jointly selects, while considering transmission quality for each relevant combination of sub-bands and matrices, a limited number of P codebook indices and a limited number of K′ sub-bands to be included in a subset ω (m | 06-11-2009 |
20090303961 | METHOD, TRANSCEIVER AND TELECOMMUNICATION SYSTEM FOR GENERATING REFERENCE SEQUENCE MATRICES AND FOR MAPPING ELEMENTS THEREOF - An method for, in a cellular telecommunication system, generating reference sequence matrices and for mapping elements of said reference sequence matrices to reference signal positions having predetermined locations in two-dimensional multi-carrier time-frequency symbol spaces is provided. According to the method, a matrix S | 12-10-2009 |
20110019528 | REDUCTION OF OUT-OF-BAND EMITTED POWER - OFDM signal transmission of reduced power emission outside a designated transmission bandwidth is disclosed. At least one subcarrier is allocated for an OFDM symbol for non-data. A weighting signal representation is determined based on an initial error signal representation, which is determined from at least part of a first OFDM symbol and part of a second OFDM symbol, the first and second OFDM symbols being consecutive in time. | 01-27-2011 |
20120147848 | GENERATING AND ALLOCATING TIME-FREQUENCY MAPPING PATTERN IN A COMMUNICATION SYSTEM - A method is provided for generating and allocating time-frequency mapping pattern (TFP) in a communication system. A set of orthogonal TFPs is generated from a TFP. And a TFP from the set of orthogonal TFPs is allocated to a user equipment in a transmission time interval, TTI, within a cell of the communication system. Also provided are a transmitter, a base station, and a user equipment. | 06-14-2012 |
20120219086 | SPECTRAL SHAPING OF MULTICARRIER SIGNALS - A method and apparatus are provided for generating and transmitting a multicarrier signal representing data symbols, where the multicarrier signal is a linear combination of subcarriers. The apparatus modulates base signals with the data symbols, where each one of the base signals is a weighted sum of the subcarriers, whereby each one of the subcarriers is weighted by an element of a weighting vector residing in a nullspace of a constraint matrix. The constraint matrix represents constraints limiting a magnitude of the multicarrier signal's Fourier transform at frequencies outside a designated bandwidth. | 08-30-2012 |
Patent application number | Description | Published |
20110103333 | CARRIER AGGREGATION - Carrier aggregation in a radio communication system is disclosed, in which at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers are aggregated, each of the at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of the radio communication system, transmission on the at least two OFDM carriers being synchronized in time. | 05-05-2011 |
20120114073 | SPECTRAL SHAPING OF MULTICARRIER SIGNALS - A method for generating and transmitting a multicarrier signal representing data symbols, where the multicarrier signal is a linear combination of subcarriers, is disclosed, as well as a transmission entity. The generation and transmission is characterized by
| 05-10-2012 |
20130129004 | DATA 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 |
20130279469 | Method and System for Allocating Communication Resources - A method of allocating communication resources for a communication between a transmitter and a receiver in a communication system, the communication resources being divided in time periods and frequency sub-bands. The transmitter receives a channel quality measurement sent by the receiver. The transmitter performs allocation of a first part of the communication resources to the receiver according to the channel quality measurement if allocation of the first part is selected, or allocation of a second part of the communication resources to the receiver if allocation of the first part is not selected. The transmitter informs the receiver of allocated communication resources, and the allocated communication resources being designated for frequency localized channels or for frequency distributed channels. | 10-24-2013 |
20140187235 | METHOD AND SYSTEM FOR OPTIMIZATION OF MEASUREMENT REPORTING IN WIRELESS NETWORKS - A controller of a layered radio environment map of a wireless communication system. The controller configures a mobile terminal to make a measurement associated with a wireless signal from the mobile terminal to a base station. The mobile terminal constructs a minimization of drive test (MDT) measurement report from the measurement, and uses a network connection to transmit the MDT measurement report. The network connection is selected based at least in part on information related to the mobile terminal. As such, the power consumption in the mobile terminal is minimized | 07-03-2014 |
20140241313 | TRANSMITTING CONSTELLATION SYMBOLS IN A COMMUNICATION SYSTEM - A method is provided for transmitting constellation symbols in a communication system. A set of orthogonal time-frequency mapping patterns (TFPs) is generated from a TFP. And a TFP from the set of orthogonal TFPs is selected for transmitting a block of constellation symbols. | 08-28-2014 |
20140334527 | METHOD AND SYSTEM FOR ALLOCATING COMMUNICATION RESOURCES - The present invention relates to a method for allocating communication resources in a multi-user cellular communication system, wherein communication resources are divided in time periods and frequency sub-bands, wherein part of the communication resources are used for frequency-localized communication channels, and part of the communication resources are used for frequency distributed channels The method further comprises the steps of: classifying part of the frequency sub-bands as frequency sub-bands carrying frequency-distributed channels, classifying the remaining part of the frequency sub-bands as frequency sub-bands carrying frequency-localized channels. The present invention also relates to a system, a transmitter and a communication system. | 11-13-2014 |
Patent application number | Description | Published |
20110019773 | SIGNAL PROCESSING CIRCUIT AND METHOD WITH FREQUENCY UP-AND DOWN-CONVERSION - A signal processing circuit comprises a frequency up-conversion circuit ( | 01-27-2011 |
20130279549 | COMMUNICATION INTERFACE FOR GALVANIC ISOLATION - In one or more embodiments, a system is provided for communicating between different voltage domains using N+1 capacitive-coupled conductive lines to provide N communication channels. For instance, bi-directional communication (e.g., a first communication in a first direction and a second communication path in the opposite direction) may be provided using three capacitive-coupled signal paths. Two of the signal paths are used as single-ended (i.e., non-differential) signal paths. The third signal path is used to suppress voltage disturbances between two voltage domains. | 10-24-2013 |
20140038534 | HARMONIC SUPPRESSION IN SWITCHING AMPLIFIERS - Configurable suppression of harmonics in a radio frequency (RF) transmitter circuit having two class-D switching amplifiers that produce a differential output signal having introduced harmonics is contemplated. A selected harmonic is used to determine a time duration. A harmonic suppression circuit modifies a radio frequency polar modulated data signal that is encoded using an amplitude component and a phase component. The modification is responsive to the determined time duration. The switching power amplifiers amplify the modified polar modulated data signal to produce an amplified signal. The amplified signal includes three signal levels, a high signal level, a middle signal level and a low signal level. The timing of transitions between the high and low signal levels represents the phase component, and the transitions include the middle signal level for the time duration, thereby suppressing the selected harmonic. | 02-06-2014 |
20140145787 | AMPLIFIER WITH FILTERING - Signals are processed to facilitate the mitigation and/or cancellation of undesirable components within the signal. As consistent with one or more embodiments, input/delay circuits offset the phase of an input signal, as presented to respective amplifiers. The phase offset is used, upon combination of the outputs of the respective amplifiers, to cancel the undesirable components of the signal. Such an approach may, for example, involve phase offset in a digital domain, with correction upon combination of the signals as presented in an analog domain. | 05-29-2014 |
Patent application number | Description | Published |
20090304044 | FREQUENCY-HOPPING ARRANGEMENT - A frequency-hopping arrangement comprises a basic-frequency branch (DIV | 12-10-2009 |
20110084741 | FAST-LOCKING BANG-BANG PLL WITH LOW OUPUT JITTER - The present invention relates to a gigitaol phaselocked loop DPLL ( | 04-14-2011 |
20110134964 | FREQUENCY SYNTHESIZER AND CONFIGURATION FOR AN ENHANCED FREQUENCY-HOPPING RATE - A frequency generating arrangement for generation of at least two predetermined frequencies is introduced. The arrangement comprises a phase locked loop circuit with at least two control value storage units and at least one controlled oscillator unit, wherein the control value storage units being configured to selectively output a control signal to the at least one voltage controlled oscillator unit, causing generation of one of the at least two predetermined frequencies. Frequency generating system for generation of ultra-fast hopping-frequency sequences comprises at least a first and a second frequency generating arrangement and further a controlling unit and a multiplexer unit for selectively connecting only one of the outputs of the two frequency generating arrangements with an output of the system. The controlling unit can be configured to control the system to generate a predetermined frequency sequence by controlling the two frequency generating arrangements such that during the period, in which one of the frequency generating arrangements is connected with the output of the system, the other frequency generating arrangement is controlled to lock to a next predetermined frequency of the predetermined frequency sequence, and to control the multiplexer unit pass the output of the other frequency generating arrangement to the system output after a predetermined time period; and repeating the controlling step in order to generate the predetermined frequency sequence. | 06-09-2011 |
20110140791 | ELECTRONIC CIRCUIT FREQUENCY GENERATION - An oscillation signal with a selectable frequency is generated with a phase locked loop ( | 06-16-2011 |
20110150043 | FREQUENCY HOPPING RECEIVER CIRCUIT - A frequency hopping receiver circuit has a frequency converter ( | 06-23-2011 |
20110188543 | STATE SAVING CONTROL FOR GENERATING AT LEAST ONE OUTPUT SIGNAL - The present invention proposes a control loop for receiving a reference signal r(t) and generating an output signal c(t) based on the reference signal r(t). The control loop comprises a subtracting element( | 08-04-2011 |
20120080529 | SMART CARD - The invention proposes a smart card which comprises a digital signal processing receiver that can automatically identify the type of a smart card reader based on the error vector magnitude of signals received from the reader. The digital signal processing receiver is able to reconfigure itself at runtime in order to optimally minimize its power consumption in dependence on the type of reader it is communicating with. Furthermore, the invention proposes a new preamble structure that comprises a basic part and an optional additional part. | 04-05-2012 |
20120269304 | Symbol Clock Recovery Circuit - A symbol clock recovery circuit is provided for a data communication system using coherent demodulation. The symbol clock recovery circuit comprises an analog-to-digital converter comprising a first input for receiving a coherent-detected baseband analog signal derived from a carrier signal, a second input for receiving an adapted symbol clock signal, and an output for outputting a digital signal comprising a frame having a preamble with at least two symbols. The symbol clock recovery circuit comprises further a phase shifting unit comprising a first input for receiving a symbol clock signal derived from the carrier signal, and a timing detector, comprising a first input for receiving the digital signal from the analog-to-digital converter and an output for providing a signal comprising information about an optimum sample phase to the phase shifting unit. | 10-25-2012 |
20130064271 | ADAPTIVE EQUALIZER AND/OR ANTENNA TUNING - Equalization circuits and methods are implemented for a variety of applications. According to one such application, a transmitting device wirelessly communicates using an antenna. The device has a transmission circuit that is configured and arranged to transmit a first wireless signal using magnetic coupling between the antenna and a remote device, the coupling occurring over a wireless medium. A receiver circuit of the transmitting device is configured and arranged to receive a second wireless signal that is from the antenna and that represents the first wireless signal as modified by the coupling occurring over the wireless medium. An error circuit of the device is configured and arranged to generate an error signal by comparing the first wireless signal to the second wireless signal. An equalizer circuit of the device is configured and arranged to pre-code the first wireless signal with coding that compensates for inter-symbol interference by compensating for the error signal. | 03-14-2013 |
20140003484 | PRE-EQUALIZER FOR A DIGITALLY MODULATED RF SIGNAL AND METHOD | 01-02-2014 |
20140192934 | RECEIVER FILTER FOR DC-WANDER REMOVAL IN A CONTACTLESS SMARTCARD - Embodiments of a method for processing a baseband signal in a Direct Current (DC)-suppressed system, a system for processing a baseband signal in a DC-suppressed system, and a smart card are described. In one embodiment, a method for processing a baseband signal in a DC-suppressed system involves processing the baseband signal in the analog domain with a first high pass filter (HPF), converting the processed baseband signal to a digital signal, and processing the digital signal in the digital domain with a second HPF to provide a discrete-time differentiation of the baseband signal. Other embodiments are also described. | 07-10-2014 |
20150063517 | CLOCK SYNCHRONIZER FOR ALIGNING REMOTE DEVICES - Various aspects of the present disclosure are directed apparatuses and methods including a first phase locked loop (PLL) circuit and a second PLL circuit. The first PLL circuit receives a carrier signal that is transmitted over a communications channel from a non-synchronous device, and generates a PLL-PLL control signal. The second PLL circuit receives a stable reference-oscillation signal, and, in response to the PLL-PLL control signal indicating a frequency offset, adjusts a fractional divider ratio of the second PLL circuit. The first PLL circuit and the second PLL circuit are configured to produce an output frequency signal that is synchronous to the carrier signal. | 03-05-2015 |