Inventors list

Assignees list

Classification tree browser

Top 100 Inventors

Top 100 Assignees


Signal noise

Subclass of:

375 - Pulse or digital communications

375224000 - TESTING

Patent class list (only not empty are listed)

Deeper subclasses:

Entries
DocumentTitleDate
20100054319OFDM WIRELESS MOBILE COMMUNICATION SYSTEM AND METHOD FOR ESTIMATING SNR OF CHANNEL THEREOF - In a method for estimating a signal-to-noise ratio (SNR) of an orthogonal frequency division multiplexing (OFDM) wireless mobile communication system, noise is estimated from adjacent received signals of at least two adjacent subcarriers and received signals of subcarriers, noise power is calculated by calculating a mean square value of the estimated noise by summing squares of the estimated noise, a mean square value of the received signals is calculated by summing squares of the received signals, signal power is calculated by subtracting the noise power from the mean square value of the received signals, and the SNR is calculated using the signal power and the noise power. Thus, the method of the present invention having low complexity can estimate an SNR efficiently regardless of channel changes on a frequency axis when one OFDM symbol includes preamble data.03-04-2010
20110002372DOWNLINK CHANNEL PARAMETERS DETERMINATION FOR A MULTIPLE-INPUT-MULTIPLE-OUTPUT (MIMO) SYSTEM - Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed.01-06-2011
20130028310EVALUATION DEVICE FOR PROVIDING A TRANSCEIVER SYSTEM WITH TRANSCEIVING PERFORMANCE INFORMATION THEREOF - An evaluation device provides a transceiver system with performance information. The transceiver system models channels between a transmitter and a receiver thereof using Nakagami distribution with a fading parameter. The evaluation device includes a setting module, a computing module and an output module. The computing module is operable, based upon the fading parameter, an average SNR of the channels, a number of transmit antennas and a number of receive antennas, to estimate an average output SNR, a bit error rate and an outage probability related to signals received by the receiver. The output module is operable to provide the transceiver system with the average SNR and the estimated information as the performance information.01-31-2013
20130028309TRANSMISSION MODE ADAPTATION IN A WIRELESS NETWORK - Conventional mode adaptation does not account for the gain imbalance between channels for measurement and for data reception. Therefore, the precoder, which is selected based on the measurement channel, may not be the optimal precoder for the data reception channel. By maintaining relative SINR ordering between transmission modes, a receiver may select the transmission mode for a transmitter that maximizes the actual throughput even in the presence of inter-antenna gain increase or decrease.01-31-2013
20100061437Systems and Methods for Impulse Noise Characterization - Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.03-11-2010
20120183035Methods and arrangements for detecting weak signals - The invention provides a method and an arrangement for detecting moving point-targets within a large set of noisy measurements. The method is based on Bayesian model selection where the measurements containing targets are modeled with their physical trajectories and the non-target measurements are modeled with the statistical distribution of measurements containing no targets. An a posteriori probability density function is utilized together with a optimization algorithm specifically designed for this problem. Advantages of the invention involve a numerically efficient formulation of the a posteriori probability density, combined with the optimization algorithm. The main applications of the invention are in detecting moving targets within e.g., radar, sonar, lidar and telescopic measurements. The method is also applicable for multi-instrument data fusion.07-19-2012
20090116543SYNCHRONIZATION OF SATELLITE AND TERRESTRIAL BROADCAST ODFM SIGNALS - Synchronization of satellite and terrestrial broadcasts in a shared frequency arrangement is use in order to facilitate simultaneous reception of the broadcasts. A delay value is adjusted based on a synchronization between a first terrestrial broadcast and a satellite broadcast, and a delay value for a second terrestrial broadcast is adjusted based on a synchronization between the second terrestrial broadcast, the first terrestrial broadcast and the satellite broadcast. The adjustment of the relative delay values provides an improved reception pattern based on receipt of a shared frequency communication from multiple sources by improving a signal quality factor within at least selected regions of the coverage areas in which the relative delay values permit synchronization. This allows for synchronization lock between multiple substantially simultaneous broadcasts as determined by a cyclic prefix window of the broadcasts in overlapping coverage areas, useful for simultaneous satellite and terrestrial broadcasts using an OFDM format.05-07-2009
20100074315NOISE SAMPLING DETECTORS - A noise sampling detector suitable for portable electronic devices is disclosed. The detector may detect noise, transmitter signals, spurs, and/or interference. In one embodiment, a detector can include: a load portion; an antenna pattern shaping portion coupled to the load portion, where the antenna pattern shaping portion includes meandering segments of variable lengths and/or widths; and an impedance matching circuit coupled to the antenna pattern shaping portion.03-25-2010
20130039404Synchronization of a Receiver to a Desired Signal - Apparatuses, methods and systems of synchronizing a receiver to a desired signal are disclosed. One method includes obtaining synchronization information of an interfering signal, and adjusting an out-of-band response of a receiver filter based at least in part on the synchronization information of the interfering signal, wherein the in-band response of the receiver filter is determined by frequency components of the desired signal.02-14-2013
20130083835APPARATUS AND METHOD FOR CHANNEL QUALITY FEEDBACK WITH A K-BEST DETECTOR IN A WIRELESS NETWORK - A receiver in a multiple input, multiple output (MIMO) system is configured to perform a method for generating channel quality feedback information. The method includes receiving, from a MIMO transmitter, pilot signals in each MIMO layer. The method also includes estimating the MIMO channel using the received pilot signals and performing a QR decomposition of the estimated MIMO channel. The method further includes predicting a probability of error for each MIMO layer after the QR decomposition of the estimated MIMO channel. The method still further includes determining a corresponding signal-to-noise ratio (SNR) for each MIMO layer based on the probability of error for the each MIMO layer.04-04-2013
20100046596RADIO COMMUNICATION SYSTEM - A radio communication system minimizes power consumption against noises. The system includes a first radio terminal (02-25-2010
20100322298DEVICE FOR EVALUATING SIDE-CHANNEL ATTACK RESISTANCE, METHOD FOR EVALUATING SIDE-CHANNEL ATTACK RESISTANCE, AND PROGRAM FOR EVALUATING SIDE-CHANNEL ATTACK - A side channel attack resistance evaluation apparatus includes: a measurement section that measures side channel information leaking from an encryption device to be evaluated; a noise removal section that removes noise from the measured side channel information using a band-pass filter (BPF); a passband determination section that determines the passband of the band-pass filter; and a DSCA (Differential Side-Channel Analysis) evaluation section that evaluates resistance against the differential side channel analysis. The passband determination section preferably has a DFT processing section and a power spectrum analysis section, or has a DFT processing and a DFA processing section.12-23-2010
20100067568SERVICE IN COMMUNICATION SYSTEMS - A method and apparatus for improving performance in communication systems is provided. In one implementation, initial encoded data that has been encoded with a rateless code is received. A quality metric is determined for a communication medium on which the initial encoded data has been received. A modulation scheme used in sending the initial encoded data on the communication medium is identified. An estimate is determined, based on the identified modulation scheme and the determined quality metric, of an amount of mutual information being received per unit of received encoded data. An amount of mutual information being received is determined, based on the determined estimate.03-18-2010
20130089130Compact Dual Receiver Architecture for Point to Point Radio - A radio frequency receiver comprising a receiver module, an intermediate frequency (“IF”) module, a synthesizer module and a controller module. The receiver module receives a radio frequency signal and provides a baseband in-phase signal and a baseband quadrature signal, eliminates a sideband of the in-phase and quadrature signals to create a first and a second signal, downconverts the first and second signal to a first and a second IF signal, and selects one of the first or second IF signals. The IF module receives the first or second IF signal, performs analog-to-digital conversion on the first or second IF signal, and demodulates the digitally converted IF signal. The synthesizer module receives a programmable reference signal, downconverts the reference signal to an IF feedback signal, downconverts the reference signal to a baseband feedback signal, provides the IF feedback signal to the IF module, and provides the baseband feedback signal to the receiver module. The controller module samples the digitally converted IF signal and provides the programmable reference signal to the synthesizer module to thereby provide a demodulated output signal.04-11-2013
20120219050METHOD AND APPARATUS FOR NOISE ESTIMATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM - The present invention discloses a method and apparatus for performing noise estimation in an OFDM system. The method comprises: a channel estimation coefficient generation module generating a channel estimation coefficient w08-30-2012
20110007791Method for the detection and generation of a useful signal and associated devices and communications system - A method for the generation of a signal including a minimum of disturbances and noise is provided. A method for the detection of a signal including a minimum of disturbances and noise is also provided. An element of the signal is functionally dependent on at least one further element of the signal.01-13-2011
20090041105COMMUNICATION CONTROL METHOD, RECEIVING STATION APPARATUS, TRANSMITTING STATION APPARATUS, AND COMMUNICATION SYSTEM - A receiving station apparatus controls a number of null carriers included in a transmission signal transmitted by a transmitting station apparatus in a communication system adopting a multicarrier modulation system to suppress inter-carrier interference by using the null carrier. For example, a reception-quality measuring unit measures a reception quality of a subcarrier group forming the transmission signal, and a number-of-null carriers determining unit determines the number of null carriers included in a next transmission signal based on the reception quality.02-12-2009
20090092178Techniques for Estimating Received Signal Strength and Carrier to Interference and Noise Ratio in OFDM Systems - A technique for determining a received signal strength indicator of a target base station at a subscriber station includes performing a discrete Fourier transform on a received signal to provide a transformed signal. In this case, the transformed signal occupies one or more segments of a channel and the one or more segments each include multiple subcarriers. A shift-n cross-correlation is calculated based on the transformed signal and a preamble sequence of the target base station to provide a coarse received signal strength indicator for the target base station.04-09-2009
20130070831Method And Apparatus For Low Complexity Robust Reconstruction Of Noisy Signals - Embodiments relate to a method and apparatus for low complexity robust reconstruction of noisy signals. The method includes receiving, by a receiving unit, a set of noisy measurements. The method further includes obtaining, by a reconstruction unit, an estimate of the signal based on the set of noisy measurements and a plurality of parameters. The plurality of parameters includes a projection matrix that transforms the signal from a sparse domain to a compressed domain and postulated parameters.03-21-2013
20130064279METHODS FOR INGRESS MITIGATION IN CABLE COMMUNICATION SYSTEMS INVOLVING REPAIR, REPLACEMENT AND/OR ADJUSTMENT OF INFRASTRUCTURE ELEMENTS - Methods for reducing ingress in a neighborhood node of a cable communication system. The node includes an RF hardline coaxial cable plant and multiple subscriber service drops to convey upstream information from multiple subscriber premises over an upstream path bandwidth. A test signal having a frequency falling within the upstream path bandwidth is transmitted proximate to one or more potential points of ingress into the hardline cable plant. Based on signal amplitudes at the test signal frequency representing test signal ingress into the hardline cable plant, one or more faults in the hardline cable plant are specifically identified and remediated so as to significantly reduce a noise power in the node in at least a portion of the upstream path bandwidth below approximately 20 MHz. In one example, hardline plant-related and/or subscriber-related faults are remediated so as to significantly reduce ingress arising from terrestrial short wave radio signals.03-14-2013
20090238255Estimation of Error Propagation Probability to Improve Performance of Decision-Feedback Based Systems - A decision feedback-based communication system comprising a unit for computing an estimated Error Propagation Probability (EPP) for a plurality of received signals, and a unit for receiving the EPP estimation and improving detected signal quality based thereon. The system can be a coded system or an uncoded system.09-24-2009
20090232194ADAPTIVE RADIO/MODULATION APPARATUS, RECEIVER APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD - Adaptive modulation part (09-17-2009
20120114030Power Scaling for Retransmissions in Uplink MIMO Hybrid ARQ - A method includes obtaining a precoder for retransmission of one codeword responsive to known precoding matrix P of rank r and modulation and coding scheme MCS assignments used in an original transmission, and a desired retransmission rank r′; and scaling power in the retransmission responsive to at least two of 1) information parameters Index of UL precoder in previous transmission, 2) rank r of uplink UL precoder in previous transmission, 3) MCS assignments in previous retransmission (MCS05-10-2012
20100086016METHOD AND APPARATUS FOR VARYING A DYNAMIC RANGE - A communications device comprises a receiver for receiving an input signal operably coupled to analogue to digital converter logic. The analogue to digital converter logic is operably coupled to control logic via a signal analyser arranged to analyse a converted received input signal, output from the analogue to digital converter logic to determine at least one characteristic of the received signal. The control logic is arranged to vary a dynamic range of the analogue to digital converter logic depending on the at least one determined characteristic of the received input signal.04-08-2010
20090060015SYSTEM AND METHOD FOR ESTIMATING NOISE POWER LEVEL IN A MULTI-SIGNAL COMMUNICATIONS CHANNEL - A system estimates noise power in a scalar, multi-signal communications channel. A data sampler collects N data samples from communications signals received from the communications channel. A module forms a covariance matrix of the N data samples based on a model order estimate. A module also computes the eigenvalue decomposition of the covariance matrix and ranks resultant eigenvalues from the minimum to the maximum for determining the noise power.03-05-2009
20100034249FEXT estimation and signaling in Vector Transmission - Embodiments related to FEXT estimation and signaling in vectored systems are described and depicted herein.02-11-2010
20110280296CHANNEL QUALITY ESTIMATION FROM RAW BIT ERROR RATE - Channel quality metrics (such as SINR, BLER, and the like) are derived from a raw bit error rate (RBER), defined as the error rate of raw bits output by a demodulator. These initial raw bits are decoded and error-checked (or error-corrected). The error-free decoded bits are re-encoded, and the regenerated raw bits are compared to the initial raw bits to determine the RBER. The RBER is then converted to SINR, BLER, or other channel quality metric. The RBER-based metrics are derived from a data channel rather than reference signals, and hence more accurately reflect deviations from nominal transmission power level, and include receiver demodulator impairments.11-17-2011
20090003425Inter-carrier Interference Measurement In Orthogonal Frequency Division Multiplexing Systems - A system for measuring inter-carrier interference (ICI) in an OFDM system includes a test symbol generator coupled to a transmitter of the OFDM system to generate an N*N orthogonal matrix having N*N test symbols, and to send the test symbols in a test symbol stream via the transmitter to a receiver of the OFDM system. The N*N test symbols are arranged by the test symbol generator into an N*N orthogonal matrix before being sent to the receiver. The system also includes an ICI measuring module coupled to the receiver to detect the N*N test symbols received in the receiver and to arrange the test symbols as a receiving matrix in the same way as the orthogonal matrix in the transmitter. The ICI measuring module outputs the receiving matrix as an ICI matrix of the OFDM system, wherein an element on the kth row, lth column of the ICI matrix represents interference from the lth sub-carrier on the kth sub-carrier, wherein k≠l.01-01-2009
20110292988CLASSIFICATION OF INTERFERENCE - An interference classifier is disclosed for determining the type of interference present in a signal. The interference classifier 12-01-2011
20090168861Link Supportability In A WCDMA Communications System - A method, computer program product, and system are provided for computing link supportability in a WCDMA communications system. For example, the method can be used to calculate link supportability of a transponder in satellite communications system (e.g. MUOS) in a user-to-base direction. This method can include expressing a carrier signal to noise ratio spectral density for a communication link of interest in terms of a transponder input power of the communication link of interest, a spectral overlap factor representative of one or more interfering communication links, and a transponder input power of the one or more interfering communication links. Assumptions and approximations can be made to simplify the spectral density expression in order to reduce a dimensionality of terms used in the computation of the expression. As such, in reducing dimensionality, the expression becomes a manageable computation for WCDMA communication systems to evaluate.07-02-2009
20120236921Method, Apparatus and Communication Unit - A method, an apparatus and a communication unit for generating precoding feedback information in a multiple frequency radio transmission system are disclosed. A rank for precoding matrices, wherein the rank is constant over the multiple frequencies, is selected and a plurality of precoding matrices having the selected rank are selected. A different precoding matrix is selected for each frequency subset of the multiple frequencies.09-20-2012
20090262793Noise performance by grouping users according to signal strength or modulation and coding scheme (MCS) - Insight and rules are needed for how to handle scheduling in a way meaningful for network operation is explained, such as what transmissions can be delayed for scheduling and which cannot be delayed for scheduling, and how grouped transmissions can be used for interference avoidance. Certain embodiments of the present invention provide a solution to these and other problems. In certain embodiments of the present invention, for example, users are grouped according to criteria which may be indirectly related to interference but are nevertheless different from interference. Thus, for example, certain embodiments of the present invention use expected receive or transmit signal strength or use MCS as grouping criteria.10-22-2009
20120033723METHOD, PRE-CODING APPARATUS AND WIRELESS COMMUNICATION SYSTEM FOR MULTIPLE-INPUT MULTIPLE-OUTPUT COLLABORATIVE COMMUNICATION - A method for multiple-input multiple-output (MIMO) collaborative communication in a wireless communication system includes at least one user equipment and M base stations performing collaborative communication with the user equipment. Here, M is an integer that is greater than or equal to 2. The method includes the following processes for each user equipment: a first level of MIMO pre-coding process is performed for each base station to acquire each first level of pre-coding matrix corresponding to each base station; a second level to the X-th level of MIMO pre-coding process is performed sequentially to acquire the second level to the X-th level of pre-coding matrices of the corresponding base stations. Here, X is an integer that is greater than or equal to 2. A pre-coding device, a user equipment and a wireless communication system related to the method are also provided.02-09-2012
20120033721Receiver with ICI Noise Estimation - The invention concerns receive circuitry for demodulating an input signal received from a transmission channel, the receive circuitry having a decision feedback equalizer (02-09-2012
20090086803APPARATUS AND METHOD FOR DETECTING SIGNALS IN A COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - An apparatus and method for detecting a signal in a communication system using multiple antennas are provided. The apparatus includes an optimal orderer for determining an order of signals that are subject to detection, a controller for controlling a parallel successive interference canceller so as to successively detect the signals according to the determined signal detection order, cancel the successively detected signals from a received signal, detect the signals in reverse order of the signal detection order, and cancel the successively detected signals from the received signal, and outputting a last detected signal and the parallel successive interference canceller for successively canceling the detected signals from the received signal according to a control of the controller. Accordingly, the invention provides a signal detection apparatus and method that improve the reliability while reducing the complexity of a communication system using multiple antennas.04-02-2009
20110200088SERVICE IN COMMUNICATION SYSTEMS - A method and apparatus for improving performance in communication systems is provided. In one implementation, information is accessed indicating the quality of at least one communication channel. Based on the accessed information, a modulation scheme is indicated for sending data over the channel encoded with a rateless code. Various different information relating to the communication channel can be used to determine a quality metric for the channel.08-18-2011
20120106613SYSTEMS AND METHODS FOR SELECTING RECONFIGURABLE ANTENNAS IN MIMO SYSTEMS - A method allows reconfigurable multi-element antennas to select the antenna configuration in MIMO, SIMO and MISO communication system. This selection scheme uses spatial correlation, channel reciprocal condition number, delay spread and average Signal to Noise Ratio (SNR) information to select the antenna radiation pattern at the receiver. Using this approach, it is possible to achieve capacity gains in a multi-element reconfigurable antenna system without modifying the data frame of a conventional wireless communication system. The capacity gain achievable with this configuration selection approach is calculated through numerical simulations using reconfigurable circular patch antennas at the receiver of a MIMO system that employs minimum mean square error receivers for channel estimation. Channel capacity and Bit Error Rate (BER) results show the improvement offered relative to a conventional antenna selection technique for reconfigurable MIMO systems.05-03-2012
20120106612METHOD OF EVALUATING THE PROFIT OF A SUBSTREAM OF ENCODED VIDEO DATA, METHOD OF OPERATING SERVERS, SERVERS, NETWORK AND APPARATUS - There is disclosed in aspects of the invention a method of evaluating the profit of a substream of encoded video data, a method of operating servers, a network and an apparatus. In the method, a data portion is identified comprising at least some of the data in the substream being evaluated; comparing a decoded version of the video with the data portion present and a decoded version of the video with the data portion removed and calculating an error metric indicative of the distortion between the two versions; and, calculating a profit for the substream dependent upon the error metric.05-03-2012
20090003426Adaptive Error Counter for a Wireless Field Device - A transmitting and receiving unit is provided for a field device for measuring a filling level or a pressure, which has an adaptive error counter. In this way, the sensitivity of the error detection may be adapted to individual needs or to the present length of the communications section. Thus, during wireless communication an optimally set error counter may fundamentally be used according to the distance to be covered without any adjustment needing to be made for this on the user side.01-01-2009
20110170586APPARATUS AND METHOD FOR PREDICTING SINR IN SPATIALLY MULTIPLEXED MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A receiver of a spatially multiplexed multiple input multiple output (SM MIMO) system divides the SM MIMO system into a plurality of virtual single input multiple output (SIMO) systems by using the estimated channel, calculates losses generated by the plurality of streams received through the plurality of reception antennas, and predicts an SINR of each stream by using the losses and the capacities of the plurality of virtual SIMO systems. It is possible to more accurately estimate the performance of a maximum likelihood (ML) detector or the performance of a detector showing the performance of a maximum likelihood (ML) detection mechanism by using the estimated SINR of each stream.07-14-2011
20120294349INTERFERENCE-WEIGHTED COMMUNICATION SIGNAL PROCESSING SYSTEMS AND METHODS - A level of interference affecting signal components of received communication signals is estimated and used to weight the signal components. The signal components in a each of a number of groups of signal components are weighted based on respective interference estimates to thereby adjust signal components for coloured interference, which may vary significantly between different groups of signal components. Each group of signal components may include a single component or components within a relatively narrow sub-band of the communication signals, such as a coherence bandwidth of an Orthogonal Frequency Division Multiplexing (OFDM) signal.11-22-2012
20100061438METHOD FOR SELECTING TRANSMISSION PARAMETERS FOR A DATA TRANSMISSION AND DATA TRANSMISSION CONTROLLER - A method for selecting transmission parameters for a data transmission is provided comprising determining, for each of a plurality of transmission parameter settings, a data throughput that is expected when the transmission parameter setting is used for data transmission, wherein the data throughput is determined using a pre-generated mapping of transmission parameter settings to data throughputs and selecting a transmission parameter setting based on the determined expected data throughputs.03-11-2010
20080279268Method for measuring noise, apparatus for measuring noise, and program for measuring noise - The frequency of signals under test is stabilized and the noise components of the signals under test whose frequency has been stabilized is measured. When the noise of the object under test is related to frequency or phase, the measured noise components are corrected based on the properties of frequency stabilization.11-13-2008
20080291990Reception quality measuring apparatus and reception quality measuring method - A reception quality measuring apparatus of the present invention comprises a first sub-carrier averaging unit for averaging and outputting a channel gain after equalization estimated on the basis of the pilot signal over a sub-carrier, a first power calculation unit for calculating the power of a signal output from the first sub-carrier averaging unit and outputting the same as signal power, a pilot replica generator for generating and outputting a pilot signal replica with respect to a zero-timing signal component based on the zero-timing signal component when a signal x(n) in the time domain after equalization corresponding to the equalized signal is n=0, and also based on a previously set pilot code characteristic, a subtractor for subtracting the pilot signal replica output from the pilot replica generator from the equalized signal and outputting the result as an interference signal, a second power calculation unit for calculating and outputting the power of the interference signal output from the subtractor, a second sub-carrier averaging unit for averaging the power output from the second power calculation unit over the sub-carrier and outputting the result as interference power, and a divider for dividing the signal power output from the first power calculation unit by the interference power output from the second sub-carrier averaging unit to calculate a reception quality after equalization.11-27-2008
20090092179Method and a circuit for estimating the signal quality of a communication channel and a wireless receiving apparatus using the same - A method for estimating the signal quality of a communication channel is disclosed. Firstly, an input signal passes through a match filter at the initial stage of an estimation period. Next, the output of the match filter is calculated to obtain the noise reference value within a pre-determined period. The output value of the match filter and the noise reference value are compared. When the output value of the match filter is larger than the noise reference value, a valid power value is obtained according to the output value of the match filter. The valid power values are accumulated. Finally, a SNR is calculated according to the noise reference value and the accumulated valid power value at the end of the estimation period. Thereby, the signal quality of the wireless communication channel is estimated according to the SNR, and the signal transmission rate is determined.04-09-2009
20100142603Testing of Elements Used in Communication Links - A receiver for a communications link includes a receiver module and a host receiver. These two components can be tested independently. In one embodiment, the receiver module is characterized with respect to noise and distortion. The noise performance can be determined by comparing input and output signals of the receiver module, to determine the relative noise of the receiver module. The distortion performance can be determined by comparing the distortion of input and output signals of the receiver module, using a reference host receiver that includes an equalizer. The host receiver can be tested by using a reference receiver module.06-10-2010
20110206107Blind SIR Estimation Using Soft Bit Values - An SIR estimate of a communication signal in a wireless communication system receiver is calculated based on soft bit values output by a nonlinear detector. The average amplitude of the detector output soft bits is estimated. The average power of the detector output soft bits is estimated, e.g., as a mean-square or variance. An SIR of the communication signal is estimated based on the soft bit amplitude and power estimates. In particular, the SIR is estimated as the ratio of the square of soft bit amplitude to the difference between the mean square soft bit power and the square of soft bit amplitude, or the ratio of the square of soft bit amplitude to the variance. In either case, the SIR estimate may be scaled to obtain the desired units. The communication signal may be a received signal, or a simulated signal generated using channel estimates obtained from, e.g., a pilot channel.08-25-2011
20090161745Parameter Estimation for Modulated Signals - A system includes a receiver for receiving a modulated signal. The receiver includes a gain estimator for converting complex data representative of constellation points of the modulated signal into scalar data representation. The gain estimator is configured to fold a first portion of the scalar data representation onto a second portion of the scalar data representation. The gain estimator is further configured to estimate a constellation gain value from the folded first portion and the second portion of the scalar data representation.06-25-2009
20090129454RATE SELECTION WITH MARGIN SHARING - Rate selection with margin sharing in a system with independent data stream rates is presented. Signal-to-Noise Ratio (SNR) estimates are obtained for each stream. Rates are selected for the streams based on the SNR estimates, such that at least one data stream has an SNR margin below a threshold, each remaining data stream has an SNR margin above a respective threshold, and the total SNR margin for all streams is above a total threshold. For rate selection with margin sharing with a vector-quantized rate set, SNR estimates are obtained for usable transmission channels. The total SNR margin is determined for each rate combination based on the estimates. Each rate combination is associated with a specific number of data streams to transmit, a specific rate for each data stream, and a specific overall throughput. The combination with the highest overall throughput and non-negative total SNR margin is selected.05-21-2009
20120069889INTERFERER PARAMETER ESTIMATION METHOD AND APPARATUS - Interference is estimated in an Orthogonal Frequency Division Multiplexing system by receiving at a wireless receiver pilot symbols and data symbols transmitted in time and frequency via resource blocks, detecting a first one of the data symbols transmitted to the wireless receiver via a time-frequency resource element of a first one of the resource blocks and identifying a second one of the resource blocks adjacent the first resource block having related interference parameters. The interference is estimated based on the pilot symbols transmitted via the first resource block and the pilot symbols transmitted via the second resource block.03-22-2012
20080317111Video Quality Measurement - This application is concerned with a non-intrusive video quality measurement method, in particular where the video signal having: an original form; encoded form in which video signal has been encoded using a compression algorithm utilising a variable quantiser step size such that the encoded signal includes a quantiser step size parameter; and, a decoded form in which the encoded video signal has been at least in part reconverted to the original form. The method comprises the steps of: a) generating a first quality measure which is a function of said quantiser step size parameter; b) generating a second quality measure which is a function of the spatial complexity of the frames represented by the video signal in the decoded form; and, c) combining the first and second measures in order to obtain an estimate for the subjective visual quality of the decoded video.12-25-2008
20090141786APPARATUS AND METHOD OF ESTIMATING SIGNAL-TO-NOISE RATIO - The present invention relates an apparatus and method of estimating a signal-to-noise ratio (SNR) of a received signal when the received signal has a timing offset. An apparatus for estimating a signal-to-noise ratio (SNR) according to an exemplary embodiment of the present invention includes a fast Fourier transform (FFT) unit that performs a fast Fourier transform on a received signal to convert the received signal into a frequency domain signal; a preamble selector that extracts a preamble from the frequency domain signal; a correlator that correlates the preamble to a preamble reference signal generated by a receiver to calculate a correlation value; an entire power estimator that calculates entire power; a noise power estimator that applies a differential demodulation method to the correlation value to remove a timing offset and calculate noise power; and an estimating unit that uses the entire power and the noise power to estimate the signal-to-noise ratio (SNR).06-04-2009
20090052512LINK ADAPTATION SYSTEM USING DOPPLER FREQUENCY AND METHOD USING THE SAME - A link adaptation system using a Doppler frequency is provided. The link adaptation system includes: a Doppler frequency estimation unit to estimate a Doppler frequency of a signal transmitted via a wireless channel; a Signal to Noise Ratio (SNR) measurement interval determination unit to determine an SNR measurement interval of the signal transmitted via the wireless channel based on the estimated Doppler frequency; and an SNR measurement unit to measure an SNR of the signal based on the determined SNR measurement interval.02-26-2009
20130215951METHODS AND SYSTEMS FOR REDUCING CROSSTALK - At least one example embodiment discloses a method of determining crosstalk in a multiple-input-multiple output (MIMO) system. The method includes receiving, from at least one first remote node, upstream pilots on an upstream channel, determining upstream channel coefficients based on the received pilots, transmitting, to the at least one first remote node, downstream pilots on a downstream channel, receiving, from the at least one first remote node, loopback pilots on the upstream channel, the loopback pilots being loopback signals of the downstream pilots, and determining downstream channel coefficients based on the received downstream pilots.08-22-2013
20100002758ADJUSTABLE TRANSMITTER POWER FOR HIGH SPEED LINKS WITH CONSTANT BIT ERROR RATE - A method and apparatus for dynamically adjusting power of a transmitter is herein described. A transmitter transmits a pattern to a receiver at a differential voltage. The length of the pattern, in one embodiment, is selected to be a reasonable length training pattern, as not to incur an extremely long training phase. If errors are detected at the receiver in the pattern, the transmitter steps the differential voltage until errors are not detected in the pattern at the receiver. The differential voltage, where no errors are detected, is scaled by a proportion of a target confidence level to a measured confidence level associated with the reasonable length training pattern. As a result, a training phase is potentially reduced and power is saved while not sacrificing confidence levels in error rates in the data exchange between the transmitter and receiver.01-07-2010
20130121392OFDM Receiver With Time Domain Channel Estimation - An OFDM communication system performs time domain channel estimation responsive to received symbols before the symbols are processed by a fast Fourier transform. The communication system generates virtual pilots from actual pilots to improve the stability and quality of channel estimation. The system generates a reference signal from the actual and virtual pilots and correlates the resulting reference signal with a signal responsive to the received symbol to generate an initial channel impulse response (CIR) and to determine statistics about the channel. In some circumstances, the resulting reference signal is correlated with a modified symbol in which the actual and virtual pilot locations are emphasized and the data locations are deemphasized. Time domain channel estimation iteratively improves on the initial CIR. The system determines channel estimates for data only symbols through averaging such as interpolation.05-16-2013
20090097535MULTI-CHANNEL DATA DETECTION PHASE LOCKED LOOP ERROR COMBINATION LOGIC - Phase-error combination for a multi-channel data detection system with a phase locked loop for each channel, comprises receiving phase error information with respect to each channel; combination logic configured to combine the received phase error information and generate a combined phase error; and a phase-error output configured to apply the combined phase error to at least one channel phase locked loop. Additionally, error signal combination comprises receiving error information of a signal relevant to a phase locked loop with respect to each channel; combination logic configured to combine the received error signal information and generate a combined error signal, weighting the received error signal information from each channel, for example with reliability information. An error compensation output is configured to apply the combined, weighted error signal to at least one channel phase locked loop.04-16-2009
20110228835COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, METHOD FOR APPROXIMATION IN FEEDBACK INFORMATION CALCULATION, AND RECORDING MEDIUM - Provided is a communication apparatus which calculates a CQI indicating reception quality of a reception signal in a receiver and feeds back the CQI to a transmitter, the CQI containing information obtained by averaging SNRs of a plurality of subbands, which are generated by dividing a reception band into a predetermined number, in the reception band, the communication apparatus including a CQI/PMI/RI estimation unit directly uses an initial value in a predetermined approximation method as an approximation calculation result obtained by the predetermined approximation method to thereby simplify the calculation, when the predetermined approximation method is used for calculation in the averaging in place of root calculation and when values of the SNRs are high.09-22-2011
20110142115METHOD AND APPARATUS THAT FACILITATES ESTIMATING DOPPLER SPREAD FOR UPLINK TRANSMISSIONS - Methods, apparatuses, and computer program products are disclosed for performing a Doppler spread estimation. In a first embodiment, an energy associated with a communication from a wireless terminal is ascertained based on at least one pilot symbol and at least one data symbol. Each of an energy variance and a noise variance are then determined to facilitate estimating a speed of the wireless terminal based on the energy variance normalized by the noise variance. In another embodiment, a signal received from a wireless terminal is decoded and replicated. A channel estimate associated with a set of data symbols is then ascertained from the replica, which is used to estimate the speed of the wireless terminal.06-16-2011
20090245340Systems and Methods for Signaling for Vectoring of DSL Systems - The measurement of far-end crosstalk (FEXT) in a Digital Subscriber Line communications is instrumental in the ability of using a multiple input multiple output (MIMO) pre-coder to cancel FEXT. A reliable robust back channel for transmission of error is instrumental to provide error samples for the proper operation of a MIMO pre-coder. Bins can be dedicated to insure bandwidth from the customer premises equipment (CPE) to the central office (CO). By increasing the margin used in the bins, robustness can be added to this back channel between the CPE and CO.10-01-2009
20080260012Receiver and receiving method - An apparatus, including a detection unit configured to perform a non-linear detection on a receive signal, a first estimator configured to estimate a first quality measure based on the receive signal, and a second estimator configured to estimate a second quality measure dependent on the first quality measure and a performance measure of the detection unit is provided.10-23-2008
20100014571ASSESSING AIRCRAFT INTERFERENCE PATH LOSS EMPLOYING DISCRETE FREQUENCY STIRRING - A method for accessing aircraft interference path loss in an aircraft. A plurality of radio frequency signals that are stepped through a plurality of frequencies in a frequency range is transmitted from a plurality of locations within an interior of the aircraft. Radio frequency signals present at a receive antenna are received in response to transmitting the plurality of radio frequency signals to form a plurality of measurements. An average of averages curve is generated from the plurality of measurements. A peak to average ratio is identified. Field uniformity is identified. A standard error for the average of averages curve is determined. An upper bound for the aircraft interference path loss in the aircraft is predicted using the average of averages curve, the peak to average ration, the field uniformity, and the standard error.01-21-2010
20120140810METHOD AND APPARATUS FOR GENERATING A PRECODING MATRIX CODEBOOK GROUP - A method and an apparatus for generating a precoding matrix codebook group are provided by the present invention. The method includes: a step for generating a channel matrix set; a step for generating a performance parameter matrix; and a step for generating a precoding matrix codebook group: based on the generated performance parameter matrix, according to contribution of every precoding matrix to the performance parameter of the communication system, ranking the precoding matrices in precoding matrix universal set, so as to achieve an ordered precoding matrix universal set as the precoding matrix codebook group. A method for assigning a precoding matrix for a multi-antenna communication system, a method for transmitting data for a multi-antenna communication system, a base station and a mobile station thereof are provided by the present invention.06-07-2012
20090129453METHOD FOR IDENTIFYING NOISE SOURCES FOR AUTOMATION DEVICES, AND NOISE SOURCE IDENTIFICATION UNIT THEREFORE - A method for identifying noise sources for automation devices (05-21-2009
20090316766METHOD OF DETERMINING A CHANNEL QUALITY AND MODEM - Data transmission is disclosed over a transmission channel that is subject to narrowband interferers. An increased overall bit or data transmission rate is achieved by an exemplary method of determining a channel capacity of plural sub-channels of the transmission channel based on a net background noise power estimation. The net background noise power contains only white noise-like contributions and excludes, to a reasonable extent, noise contributions or signal power from narrowband interferers. Hence, the net background noise power can be reduced. For example, an Orthogonal Frequency Division Multiplex (OFDM) signal code construction or bit allocation scheme can be chosen that provides for optimized data transmission at a data rate that approximates or approaches the more realistic channel capacity of an individual sub-channel, resulting in an increased overall bit or data transmission rate.12-24-2009
20100260249METHOD OF EXAMINING ELIGIBILITY OF A MODULATION AND CODING SCHEME FOR A COMMUNICATIONS SYSTEM - A method of examining the eligibility of a modulation and coding scheme includes determining a range of pseudo signal-to-noise ratio (pseudo-SNR) corresponding to a range of packet correct rate (PCR) acceptable for a transmitter, obtaining a first score of a positive acknowledgement (ACK) and a second score of a negative acknowledgement (NACK) according to the range of pseudo-SNR and the range of PCR, applying weighting to a score of a response message, which is one of an ACK message and a NACK message, and a pseudo-SNR corresponding to an immediately preceding response message when receiving the response message, for generating a pseudo-SNR corresponding to the response message, and examining the eligibility of a modulation and coding scheme in use according to the pseudo-SNR corresponding to the response message.10-14-2010
20100158093Methods and System for Determining a Dominant Impairment of an Impaired Communication Channel - Methods are described for identifying a dominant impairment on a communication channel impaired by an interference issue. The methods include systematic examination of total power loading, systematic examination of signal power reduction, statistical examination of communication channel noise power, and systematic examination of interleaver effectiveness. Each relates to automatically diagnosing and characterizing distortion-based interference issues by monitoring the performance of a communication channel during a testing procedure. These methods enable a technician or engineer to remotely diagnose distortion-based interference issues relatively quickly without having to use external test equipment and without having to deploy technicians to various locations within the cable plant. A system by which these methods can be implemented is also disclosed.06-24-2010
20100128769NOISE ESTIMATION APPARATUS AND RELATED METHOD THEREOF - A noise estimation apparatus and method thereof includes an evaluation circuit, a first calculation circuit, a second calculation circuit, and a mean calculation circuit. The evaluation circuit is utilized for determining which constellation point on a constellation diagram each received symbol in a communication signal corresponds to for purposes of generating a relevant evaluated symbol and outputting an evaluated signal. The first calculation circuit is for generating an error output signal according to the communication signal and the evaluated signal, wherein the error output signal includes a plurality of error calculation values. The second calculation circuit is utilized for adjusting at least a portion of the plurality of error calculation values of the error output signal in order to output an adjusted error output signal. The mean calculation circuit is utilized for averaging the adjusted error output signal in order to generate a noise estimation result.05-27-2010
20090279596Method for encoding frame data - In applications where data is transmitted in frames of symbols and the transmission medium is such that the probability of correct reception of symbols is, on the average, not uniform for different symbols in a frame, transmission of test frames enables creation of information about the different probabilities of correct reception, and that information is employed by the transmitter to control the manner in which symbols are transmitted so as to ameliorate the effects of the different probabilities of correct reception.11-12-2009
20120033722Time-Domain Link Adaptation - Embodiments of the invention provide time-domain link adaptation in power line communications. In one embodiment, the cyclic prefix length and position is adjusted with an OFDM symbol to overlap a periodic impulse noise pulse, thereby allowing the data carried in the symbol to be detected at a receiver. The cyclic prefix may be adjusted to provide a pattern that yields an integer number of OFDM symbols in one zero crossing period. The data rate used for the symbols overlapping the zero-crossing period may be zero or very low. A high data rate may be used for symbols outside the zero-crossing period because those symbols will not be affected by the periodic impulse noise.02-09-2012
20090074047APPARATUS AND METHOD FOR ESTIMATING SIGNAL TO INTERFERENCE AND NOISE RATIO IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method for estimating a Signal to Interference plus Noise Ratio (SINR) in a wireless communication system are provided. The method includes processing a received signal by Orthogonal Frequency Division Multiplexing (OFDM) demodulation to convert the received signal into frequency-domain data, selecting ranging data from the frequency-domain data, multiplying the selected ranging data by a ranging code to perform code demodulation, calculating at least one norm value and at least one coherent norm value by bundle for the code-demodulated data and estimating an SINR using the calculated at least one norm value and at least one coherent norm value.03-19-2009
20130128940METHODS FOR DETERMINING DECODING ORDER IN A MIMO SYSTEM WITH SUCCESSIVE INTERFERENCE CANCELLATION - Certain aspects provide a method for determining decoding order and reconstruction weights for decoded streams to be cancelled in a MIMO system with successive interference cancellation, based on estimates of the channel characteristics, the received composite signal and parameters of the system.05-23-2013
20100296568METHOD AND APPARATUS TO CANCEL ADDITIVE SINUSOIDAL DISTURBANCES IN OFDM RECEIVERS - Orthogonal frequency division multiplexing (OFDM) has become a popular transmission method for high speed wireless radio transmission, due to its potential for low complexity of transmitters and receivers. A method and apparatus are contemplated for cancelling additive sinusoidal disturbances of a known frequency in OFDM receivers which arise e.g. from clock signals that are present for frequency reference, mixer control, and A/D converter control, as well as harmonics and mixing products of those periodic signals, coupling into some point in the receiver chain and appearing as rotating complex exponentials superimposed to complex baseband receive signals. According to the inventive method and apparatus an estimation of an amplitude and phase of a disturbing superimposed tone with a known frequency is obtained and the amplitude and phase estimation is used to cancel the spurious tone preventing a degradation of receiver sensitivity while achieving low implementation complexity.11-25-2010
20110129009METHOD AND SYSTEM FOR EFFICIENT CHANNEL ESTIMATION - Aspects of the present disclosure describe an efficient channel estimation algorithm for high-speed processing of dedicated reference signals. The channel estimation algorithm may utilize one or more compressed interpolation matrices. The compressed interpolation matrices may be selected based on the Doppler value and signal to noise ratio (SNR) of the channel.06-02-2011
20100296566METHOD AND APPARATUS FOR DETERMINING A CALIBRATION SIGNAL - Embodiments of a system for determining and optimizing the performance a signaling system are described. During operation, the system captures or measures a single-bit response (SBR) for the signaling system. Next, the system constructs an idealized inter-symbol-interference-free (ISI-free) SBR for the signaling system which is substantially free of inter-symbol-interference (ISI). The system then calculates an ISI-residual from the captured SBR and the idealized ISI-free SBR. Next, the system constructs a calibration bit pattern for the signaling system that is based substantially on the ISI-residual. Finally, the system uses the calibration bit pattern to calibrate, optimize and determine an aspect of the performance of the signaling system.11-25-2010
20130136166Measuring Interference and Noise Power Using Non-Content Burst Periods - Embodiments describe a method of measuring noise and interference within transceivers of an OFDM wireless transmission system, or similar communication system, including a number of receivers communicating with one or more base stations in cell or sector arrangements. The transmitter schedules a transmission burst for a non-existent user (receiver) using wireless transmission traffic. In an OFDM system, this corresponds to a certain set of subcarriers in the time/frequency arrangement. Thus, in the receive frame structure, the data and pilot subcarriers are guaranteed to be only noise and interference from adjacent sectors. The receiver can accurately measure the noise and interference without needing to cancel out the transmitted signal. Therefore, the system is assured that there is no desired signal as part of this measurement. The noise and interference measurement process can be appropriately scheduled so that it does not impact the overall throughput of the system. This mechanism creates a deterministic place (in time and/or frequency) within the transmission, where no desired signal is required.05-30-2013
20110026574SIGNAL AND NOISE POWER ESTIMATION - Techniques for estimating desired signal power and noise power of a signal received over a communications channel. In an aspect, a pilot autocorrelation matrix is derived based on certain assumptions about the time delay profile, Doppler profile, and/or spatial correlation of the channel. The pilot autocorrelation matrix is decomposed into a set of eigenvectors. From the eigenvector decomposition, a set of dominant eigenvectors is selected to estimate the signal power, while a set of non-dominant eigenvectors is selected to estimate the noise power. The techniques may readily be applied to arbitrary pilot patterns and to a wide array of SNR ranges and channel conditions.02-03-2011
20110110414MULTICELLULAR COOPERATIVE COMMUNICATIONS IN A DECENTRALIZED NETWORK - In a multicellular cooperative radio communications method, the terminals estimate and communicate to all the access points of a cooperating cluster of access points information on the transmission channels between them and each access point of the cluster. The access points include homologous processor for scheduling the servicing of the terminals and operating in accordance with a particular criterion common to all the access points. Finally, the servicing of the terminals is effected jointly by said access points, in an order determined by the processor, using transmission parameters on the basis of the information on the transmission channels transmitted by the terminals.05-12-2011
20110019727Method and System for Determining Synchronization Status in a Wide Band CDMA Network - A method and system for determining synchronization status in a wide band CDMA (WCDMA) network may comprise calculating a signal to noise ratio (SNR) of a downlink dedicated physical channel (DPCH) based on a plurality of transmit power control (TPC) bits received via the downlink dedicated physical channel (DPCH), wherein the value of at least one of the plurality of TPC bits is not known when at least one of the plurality of TPC bits is received. The transmit circuitry may be controlled based on the calculated signal to noise ratio. The transmit circuitry may be disabled if the calculated SNR of the plurality of TPC bits is below a first channel threshold. The transmit circuitry may be enabled if the calculated SNR of the plurality of TPC bits is above a second channel threshold.01-27-2011
20110243210APPARATUS AND METHOD FOR POWER SAVING USING REQUANTIZATION IN BASEBAND MODEM - In the power saving, a method for saving power at a receiver of a mobile communication system includes acquiring Carrier to Interference plus Noise Ratio (CINR) and Modulation and Coding Scheme (MCS) information required by the receiver; determining the number of Least Significant Bits (LSBs) to hold based on the CINR and MCS information; and holding LSBs of the determined number of the bits in received information.10-06-2011
20110243209Method device & system for receiving a communication signal - Disclosed is a receiver, such as an orthogonal frequency-division multiplexing (OFDM) receiver, including two or more receiver chains. Each of the receiver chain may include an antenna, down converting circuitry and time to frequency converting circuitry, and the two or more chains may be adapted to operate in concert so as to receive substantially the same signal substantially concurrently. Signal processing circuitry may be adapted to constructively combine signals received at the two or more receiver chains into a unified signal. Selection logic may be adapted to select a mode of signal combination by the signal processing circuitry, wherein the selection logic may be adapted to instruct the processing circuit to either combine two or more received signals into a single received signal or to use only one of the two or more received signals for further processing.10-06-2011
20110142116METHOD AND APPARATUS FOR ESTIMATING CHANNEL PARAMETER - A method and apparatus for estimating a channel parameter in a multi-antenna system is provided. The method of estimating a channel parameter includes selecting at least a part of received data as an effective segment based on power of the received data, and estimating a channel parameter by applying a channel estimation algorithm to received data within the selected effective segment. Accordingly, it is possible to reduce the amount of calculation by removing noise signals from received data and measuring channels using signals within an effective signal segment when the channel parameters are estimated.06-16-2011
20090154540METHOD AND APPARATUS FOR ESTIMATING CHANNEL IN MOBILE COMMUNICATION NETWORK - The present invention relates to a method and apparatus for estimating a channel in a mobile communication network. In particular, the present invention relates to a method of estimating a channel under a channel environment where interference between neighboring base stations exists in a mobile communication network using an orthogonal frequency division multiplexing (OFDM) method. In order to estimate a channel, one cluster is divided into two sub-clusters, and pilot sub-carrier signals included in at least one sub-cluster in an OFDM symbol direction are used. Therefore, it is possible to further improve performance as compared to a method of estimating a channel by using pilot sub-carriers included in one cluster.06-18-2009
20120243594Load Estimation in Wireless Communication - A method for noise rise estimation in a wireless communication system comprises receiving (09-27-2012
20100061436SIGNAL MODULATION APPARATUS, SIGNAL MODULATION METHOD, AND COMPUTER PROGRAM PRODUCT - A signal modulation apparatus, a signal modulation method and a computer program product thereof are provided. The signal modulation apparatus is used in a communication framework consisting of a plurality of communication systems. The communication systems comprise a first communication system having a first antenna and a second communication system having a second antenna. The signal modulation apparatus is configured to generate isolation information to modulate a power of a first antenna according to specification information of the first communication system, specification information of the second communication system, information of the first antenna, information of the second antenna, distance information of the first antenna and the second antenna, and test information.03-11-2010
20100135374METHOD AND DEVICE FOR CROSSTALK EVALUATION AND COMMUNICATION SYSTEM COMPRISING SUCH DEVICE - A method and a device are provided for crosstalk evaluation of a channel, wherein the channel is represented and/or modeled by a multiple-input-multiple-output (MIMO) system connecting a first network component with at least one second network component. The MIMO system contains first coefficients associated with transmission lines that are in particular associated with crosstalk. The crosstalk contains a near-end crosstalk (NEXT) portion and a far-end crosstalk (FEXT) portion. The first network component sends a signal to one second network component; the far-end crosstalk portion and the near end crosstalk portion are evaluated.06-03-2010
20100067569METHOD OF MONITORING CIRCUIT QUALITY AND CIRCUIT THEREFOR - In a digital wireless communication device having an error correction function, the circuit quality is quickly detected with maintained accuracy. The circuit quality to such an extent that a bit error rate (BER) is slightly degraded (1003-18-2010
20090213919SIGNAL QUALITY ESTIMATION FOR OFDMA SYSTEMS - Certain embodiments utilize raw signals to estimate channel quality, as contrasted to utilizing equalized signals or after channel estimation. For example, signal quality may be estimated by calculating powers of pilot sub-carriers and null sub-carriers of the raw signals. To mitigate channel effect, certain embodiments utilize first and/or second order differentiation schemes.08-27-2009
20120121002Receiver and Signal Receiving Method Thereof - A signal receiving method of a receiver includes following steps. Multiple time-domain received signals are transformed into multiple frequency-domain received signals, and channel response matrices corresponding to the frequency-domain received signals are estimated. The frequency-domain received signals are STBC decoded and multiple original combination signals are obtained based on the corresponding channel response matrices. The frequency-domain received signals are rearranged, and the rearranged frequency-domain received signals are STBC decoded and multiple rearrangement combination signals are obtained based on the corresponding channel response matrices. The original combination signals and the rearrangement combination signals are randomly chosen and summed to obtain multiple complex signals. The complex signal with minimum interference power is selected and then the selected signal is used to cancel interference and compensate the channel effect to obtain the detected data.05-17-2012
20110069748Measuring Bit-Error-Rates of Forward Error Correction Code Encoded Signals - A device may include one or more components and a processor. The one or more components may obtain bit-error-rates of a signal and signal-to-noise ratios of the signal. The processor may select a target signal-to-noise ratio for the signal, determine a target noise level based on the target signal-to-noise ratio, set a noise level of the signal to the target noise level, determine a signal-to-noise ratio of the signal via the one or more components, adjust the noise level of the signal based on the determined signal-to-noise ratio, to stabilize the signal-to-noise ratio, determine a bit-error-rate of the signal via the one or more components, and record the bit-error-rate.03-24-2011
20120201286SYSTEM AND METHOD FOR IMPROVING SPECTRAL EFFICIENCY AND PROFILING OF CROSSTALK NOISE IN SYNCHRONIZED MULTI USER MULTI-CARRIER COMMUNICATIONS - A system, method, and a computer readable medium having instructions thereupon for synchronized multi-user multi-carrier communications are provided. For example, a synchronized multi-user multi-carrier communication system includes a transmitter, a receiver communicatively coupled to the transmitter via a plurality of communication channels associated with multiple users, and a computing device, coupled to at least one of the transmitter and the receiver, comprising a memory device in communication with one or more processors. The one or more processors are configured to obtain noise samples for the plurality of communication channels, determine a coupling between carriers on the plurality of communication channels, determine a noise model for a carrier based upon the noise samples and the determined coupling, and store the noise model in the memory device.08-09-2012
20120201285Apparatus and Method for SINR Estimation HSDPA MIMO Receiver - In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.08-09-2012
20110150067Echo canceller for eliminating echo without being affected by noise - In an echo canceller, a specific frequency component eliminator eliminates a specific frequency component of a specific frequency from a receiver signal to output a resultant signal to an echo path. A specific frequency component detector detects a frequency component of the same frequency as the specific frequency eliminated by the specific frequency component eliminator from the transmitter signal. A noise calculator finds noise power on the basis of power of the specific frequency component detected by the specific frequency component detector, and finds total power including noise and an echo component on the basis of power of a frequency component including the echo component. A control parameter calculator uses the noise power and the total power found by the noise calculator to find a control parameter of the echo canceller.06-23-2011
20100303141APPARATUS AND METHOD FOR RECEIVING SIGNAL USING RAKE RECEIVER AND EQUALIZER IN WIRELESS COMMUNICATION SYSTEM - An apparatus and a method for selecting a receiver for demodulating a reception signal at a reception end having a plurality of receivers are provided. The method includes determining, a mean and a standard deviation of Signal-to-Noise Ratios (SNRs) of the receivers are determined, estimating a Doppler frequency, determining a statistical value of a modulation order of subframes received in advance, determining SNR estimation values of the receivers based on the determined mean and standard deviation of the receivers, the estimated Doppler frequency, and the determined statistical value of the modulation order of the received subframes, selecting one receiver having a largest SNR estimation value among the determined SNRs of the receivers, and demodulating a reception signal using the selected receiver.12-02-2010
20100303140SNR estimation system for multi-carrier communication - A signal to noise power ratio estimation system for multi-carrier communication includes a phase rotator, a power estimator, a channel gain calculator, an average and selection device, a combination and calculation device and a decibel (dB) transformation device. The signal to noise power ratio estimation system makes use of a transmit parameter signaling or pilot subcarriers to blindly assist in the signal to noise power ratio estimation to accordingly gain an estimated signal to noise power ratio accurately, and thus a communication system can be calibrated to a preferred condition.12-02-2010
20100296567Channel-sensitive power control - A communication receiver which applies signal processing for quantitatively estimating receive signal factors such as communication channel quality, signal characteristics, and overall system received bit error rate (BER) or packet error rate (PER) and which applies a general algorithm for mapping these estimated factors to control receiver performance and minimize power consumption.11-25-2010
20110176598NETWORK EVENT DETECTION - Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for identifying network events. In one aspect, a method includes monitoring signal characteristic values for signals transmitted over a communications channel of a power line communications system and determining that a signal level value for the channel is less than a threshold signal level value for the channel. In response to determining that the signal level value for the channel is less than the threshold signal level value for the channel, computing a signal to noise ratio for the communications channel and determining that the signal to noise ratio for the channel exceeds a threshold value. In response to determining that the signal to noise ratio for the communications channel exceeds the threshold value, storing data received over the communications channel as valid data.07-21-2011
20110176599Rate-Adaptive Multiple Input/Multiple Output (MIMO) Systems - A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.07-21-2011
20100002759LOW BIAS ESTIMATION OF SMALL SIGNAL-TO-NOISE RATIO - A method implemented by a user equipment includes selecting a first estimate of a signal-to-noise (SNR) ratio, calculating a first amplitude and first noise variance, calculating a second amplitude and a second noise variance, calculating a second SNR, calculating a resolution value, adjusting the first SNR, and performing estimation iterations until the resolution value is equal to a predetermined value.01-07-2010
20110164670POWER LINE COMMUNICATION SYSTEM - The present invention relates to a communication system comprising a transmitter and receiver in communication for transmitting signals through one or more communications channels, wherein at least one of the transmitter and the receiver each comprise a quality measure, which contributes to an overall quality measure for the system and wherein the or each communications channel comprises a plurality of sub-bands between at least two nodes, wherein the plurality of sub-bands each having a specific maximum power spectral densities (PSDs) and wherein one or more sub-bands between the transmitter and the receiver are identified as having a higher maximum PSD than other sub-bandsand wherein the PSD of the one or more identified sub-bands is reduced in a predetermined manner to thereby increase the overall quality measure for the system.07-07-2011
20110164669Systems and Methods for Determining Noise Components in a Signal Set - Various embodiments of the present invention provide systems and methods for estimating noise components in a received signal set. For example, one embodiment of the present invention provides a noise estimation circuit that includes a data detector circuit and a noise component calculation circuit. The data detector circuit receives a series of data samples and provides a detected output, and the noise component calculation circuit provides an electronics noise power output and a media noise power output each calculated based at least in part on the detected output and the series of data samples.07-07-2011
20090074046Data Structure Boundary Synchronization Between a Transmitter and Receiver - Synchronization between a transmitter and a receiver with respect to the boundary of higher-layer logical data structures is improved by considering both the statistical likelihood of the value of a transmitted boundary indicator and the quality of the channel during the transmission. A boundary indicator received under poor channel quality, that is decoded to a statistically unlikely value, is suspect and one or more retransmission is requested. A reliable value of the boundary indicator is a retransmitted boundary indicator received during good channel conditions; the value of two boundary indicators received successively, both under poor channel conditions, that decode to the same value; or a majority vote of three successive boundary indicators, the first two received under poor channel conditions. The accuracy of the received boundary indicator is increased, at a cost of one, or at most, two, retransmissions.03-19-2009
20100329321ELECTRONIC DEVICE FOR RECEIVING A RADIO-FREQUENCY SIGNAL - An electronic device includes an analog-to-digital converter adapted to receive a radio-frequency signal and adapted to provide therefrom a digital signal, wherein the radio-frequency signal may include an interference signal. The electronic device has a controller adapted to perform a digital measure on the digital signal and adapted to generate therefrom a selection signal having a first value indicating a non-interference condition in the radio-frequency signal and having a second value indicating an interference-condition in the radio-frequency signal. A selector is adapted to transmit the digital signal in case the selection signal has the first value and to transmit a signal replacing the digital signal in case the selection signal has the second value.12-30-2010
20110038405Communications Unit and Method for Detecting Pulse Interference - A communication method for use in a first cellular communications system is proposed for minimizing the interference caused by strong interfering pulses in the same frequency band as the system or an adjacent frequency band. The method comprises the steps of receiving an incoming signal bandpass filtering the incoming signal to filter out a first frequency band (B02-17-2011
20110261872CHANNEL QUALITY ESTIMATION FOR MLSE MIMO RECEIVER - A receive signal processor jointly detects two or more symbols in a signal-of-interest in the presence of one or more other MIMO signals. The signal-to-interference-plus-noise ratio for each signal-of-interest is determined by computing per-subcarrier signal-to-interference-plus-noise ratios for a plurality of subcarriers allocated to the signals-of-interest, and computing a total signal-to-interference-plus-noise ratio for the subcarriers based on the per-subcarrier signal-to-interference-plus-noise ratios of the subcarriers. A controller determines one or more transmission formats for uplink transmissions based on the signal-to-interference-plus-noise ratios. The process of computing per-subcarrier signal-to-interference-plus-noise ratio reflects the amount of MIMO interference already cancelled or still remaining in the signal arriving at the joint detector.10-27-2011
20110142117SIGNAL DETECTING METHOD AND DEVICE FOR MULTI-CODEWORD MIMO SYSTEM - A signal detecting method and device for a multi-codeword multi-input multi-output (MIMO) system are provided, which are used in the field of communication and solve the problem that it is complex to implement a signal detecting method in the multi-codeword MIMO system and the error between the signal obtained through detection and the signal actually transmitted from the transmitting end is large. The method includes: converting a received complex number signal into a real number signal; performing channel estimation to obtain a channel matrix; correcting the channel matrix to obtain an equivalent corrected matrix; generating an equivalent detecting signal according to the equivalent corrected matrix and the real number signal obtained through conversion; quantizing the equivalent detecting signal to obtain an equivalent quantized detecting signal; and generating a signal transmitted from a transmitting end according to the equivalent quantized detecting signal. The method and device can be applied in a receiving device of a multi-codeword MIMO system.06-16-2011
20120177097METHOD FOR GENERATING HYBRID CODEBOOK AND HYBRID MU-MIMO SYSTEM - A method for generating a hybrid codebook for a Multi-User Multiple-input Multiple-Output (MU-MIMO) system includes the steps of: generating a parent matrix set including a plurality of M×M unitary matrices when the number of transmitter antennas is M; and generating a child matrix set dependent on the parent matrix set by using training vectors included in a random training set and each column for each unitary matrix of the parent matrix set as an initial vector codebook.07-12-2012
20100254445PROCESSING TRANSMISSIONS IN A WIRELESS COMMUNICATION SYSTEM - Disclosed herein are methods of processing transmissions in a wireless communication system to detect whether a transmission unit contains transmitted data, systems for processing transmissions in a digital communications system to detect the same, receivers for processing transmissions in a wireless communications system and computer readable media implementing a method for processing the same. In one embodiment, a method of processing transmissions in a wireless communication system to detect whether a transmission unit contains transmitted data includes: generating an averaged function of bit reliability indicators from a plurality of received samples and applying a test to compare an average of ln cos h(·) (natural logarithm of the hyperbolic cosine) values for the reliability indicators, with a factor proportional to an average signal-to-disturbance ratio of the plurality of samples to determine if the transmission unit contains transmitted data.10-07-2010
20100195707MOBILE STATION DEVICE - A mobile terminal device for performing multi-carrier communication with a base station device can improve communication quality while reducing the data amount without lowering accuracy of feedback information. In the mobile station device (08-05-2010
20110051792SIGNAL ANALYZING APPARATUS FOR LTE SYSTEM - A signal analysis apparatus of an LTE system includes a radio frequency reception unit for receiving a radio frequency signal of the LTE system and converting it into a signal of an intermediate frequency, a digital signal conversion unit for converting an analog signal, processed by the radio frequency reception unit, into a digital signal, a baseband conversion unit for converting the signal of the intermediate frequency into a baseband signal, a baseband signal simple analysis unit for decoding the baseband signal in real time in accordance with an LTE standard, a signal depository for storing the baseband signal, a baseband signal precision analysis unit for decoding and analyzing the baseband signal in accordance with the LTE standard and analyzing various items derived in the decoding process, two switching units for alternatively connecting the baseband conversion unit or the signal depository to the baseband signal simple analysis unit or the baseband signal precision analysis unit, and a control unit for controlling the switching units.03-03-2011
20110188561SNR ESTIMATION - A method for estimating a Signal to Noise Ratio (SNR) in a received signal including, for a fixed first set of a plurality of samples from the received signal, providing an initial noise estimate, starting with the initial noise estimate, iteratively improving the noise estimate, and estimating SNR based, at least partly, on the fixed first set of samples from the received signal and the noise estimate. Additional related apparatus and methods are also described.08-04-2011
20110188560Matching Pursuits Basis Selection - A method, apparatus, and computer-readable medium for basis selection is described. A plurality of sub-bands of digital data is generated and a basis function for the digital data in one of the plurality of sub-bands is determined at a rate that provides a substantially peak signal-to-noise ratio for the digital data. The basis function is added to a codebook and the digital data is compressed using the codebook.08-04-2011
20100020859SIGNAL TRANSMISSION APPARATUS AND SIGNAL TRANSMISSION CONTROL METHOD - A signal transmission apparatus comprises a first signal transmission section configured to transmit a first signal for performing measurement of characteristics of a transmission line to the transmission line. A reflection characteristic measurement section is configured to measure a reflection characteristic of the transmission line. A pass characteristic measurement section is configured to measure a pass characteristic of the transmission line. A determination section is configured to determine a transmission clock frequency based upon the reflection characteristic. A second signal transmission section is configured to modulate information and to transmit a second signal obtained by the modulation to the transmission line. A second signal receiving section is configured to receive and to demodulate the second signal which has been transmitted by the second signal transmission section and has passed the transmission line.01-28-2010
20080310490Signal Generator and User Interface for Adding Amplitude Noise to Selected Portions of a Test Signal - A signal generator generates amplitude noise on a selected segment of a test signal. A user interface is used for selecting a segment of the test signal and an associated power level for applying amplitude noise at a selected power level to the test signal segment. A signal processing unit compiles the selected power level of the selected segment with the test signal to generate digital data representative of the test signal with selected segments having amplitude noise. A waveform generator receives the digital data and generating a test signal output having amplitude noise at selected segments of the test signal. The method includes the steps of: selecting a segment of the test signal to add amplitude noise; selecting a power level for the amplitude noise; and applying the amplitude noise at the selected power level to the selected segment of the test signal.12-18-2008
20110038406METHOD AND DIGITAL COMMUNICATION DEVICE FOR RECEIVING DATA USING QAM SYMBOLS - A digital communication system which applies channel coding and QAM modulation, where in QAM, at the transmitter, a number Q of bits is mapped to one QAM symbol, which is transmitted over the channel, at the receiver side, for each QAM symbol, a de-mapping is performed in order to obtain an L-value for each bit which corresponds to the QAM symbol, such that these L-values provide not only an estimation of the transmitted bits but also give information about their reliability02-17-2011
20110305267Precoder for a Communication System and Methods Used in Said Communication System - The present invention relates to a precoder for a communication system arranged to provide transmission blocks for transmission over a transmission channel based on inputted symbol blocks. The precoder is arranged to pre-distort each symbol block based on an estimate of the characteristics of the transmission channel so that the corresponding transmission block appears to be undistorted after transmission over the transmission channel. In accordance therewith, the precoder is arranged to apply Tomlinson-Harashima precoding on a sum of a first measure corresponding to predistortion so as to remove intrasymbol interference and a second measure corresponding to predistortion so as to remove intersymbol interference. The present invention further relates to a method for providing transmission blocks for transmission over a transmission channel in a communication system.12-15-2011
20110305268Method and System and Device for CQI Estimation Disturbance Cancellation - The current invention relates to a method of determining a quality of a received signal, wherein the method comprises receiving a signal comprising a first part and a second part and wherein at least the second part of the received signal comprises a scrambling sequence period; and determining a first noise-and-interference power of the first part of the received signal by removing a second noise-and-interference power of the second part of the signal, wherein the scrambling sequence period is utilized in the removal. The invention further relates to a corresponding device and system. Thereby, the invention is able to, among other things, reduce neighbor cell reference symbol interference in a dense network.12-15-2011
20090034598METHOD AND APPARATUS TO COMPUTE A NOISE POWER ESTIMATE IN A WCDMA NETWORK BASED ON DEDICATED PHYSICAL CONTROL CHANNEL (DPCCH) PROCESSING - A method to process DP bits within a WCDMA receiver where a noise estimation that may be implemented within hardware is provided for improved flexibility and performance. DPCH pilot symbols are received, quantized, channel compensated and combined. The computation of an SNR estimate based on the combined DPCH pilot symbols is provided. Noise estimation is used as part of the SNR estimation of the DP bits (used for downlink power control). This method does not rely on the assumption that the channel is constant over the DP field, while prior methods did.02-05-2009
20090103598Link adaptation in wireless networks for throughput maximization under retransmissions - The present invention implements a method and system for dynamically adapting the modulation and coding scheme for radio links in a wireless communications network based on a retransmission environment model in order to maximize throughput and most efficiently allocate bandwidth resources. The present invention encompasses a refined calculus and methodology for deriving the link adaptation thresholds in a retransmission environment using a complex model and analysis of the retransmission environment. The present invention holds particular application for wireless data communications as opposed to real time data services because it is based on a retransmission model applicable primarily for data services. A critical component of this new link adaptation system is a “no transmission” cutoff mode that is selected for SIR below a base threshold value. This new mode prevents system instability and misallocation of bandwidth in a wireless communication system.04-23-2009
20120099634RECEIVING DEVICE AND METHOD, DEMODULATING DEVICE AND METHOD, AND PROGRAM - The present disclosure provides a receiving device including, a receiver configured to receive a signal that is transmitted via a propagation path and is modulated by a predetermined system prescribed by a predetermined standard, a demodulator configured to demodulate a received signal, an estimator configured to estimate a signal-to-noise ratio relating to the propagation path, obtained from a data signal included in the demodulated received signal, and a corrector configured to correct an estimated signal-to-noise ratio in accordance with a transmission parameter obtained from the received signal.04-26-2012
20110090944APPARATUS AND METHOD FOR SIGNAL QUALITY MEASUREMENT ON GFSK SIGNALS - The present invention discloses an effective apparatus and method to measure the received signal quality for a GFSK modulated signal with (or without) an unknown modulation index. The signal quality measurements are based on the decoded (unknown or known) bits and the trellis of the frequency discriminator output. This trellis is pre-calibrated with a reference Rx. The transmitted modulation index is also accurately estimated in this invention.04-21-2011
20110158305Reporting Channel Quality Information for Multiple Channels - Aspect of the invention relate to a method for reporting channel quality information from a user equipment (UE) to a base station. In some embodiments, the method includes: determining a first channel quality value (CQ06-30-2011
20110158304TECHNIQUES TO CONTROL UPLINK POWER - Techniques are described that provide uplink power control techniques that can support different uplink multi-input multi-output (MIMO) transmission schemes. A mobile station determines a Signal to Interference-plus-Noise Ratio based on base and offset values transmitted from a base station. The base station can transmit the base and offset values using seven bits total. The mobile station determines an uplink transmitter power level based on the Signal to Interference-plus-Noise Ratio.06-30-2011
20110090945METHOD AND APPARATUS FOR COOPERATIVE MIMO TRANSMISSION OPERATION IN MULTICELL WIRELESS NETWORK - A method and apparatus of configuring a multi-cell precoding matrix for a multiple input multiple output (MIMO) operation in a wireless communication system in which a plurality of base stations participate in cooperative communication is provided. A multi-cell precoding matrix is configured using one or more single-cell precoding matrices, and wherein coefficients to be multiplied by the single-cell precoding matrices satisfy a condition in which the product between the multi-cell precoding matrix and a Hermitian matrix of the multi-cell precoding matrix is a unitary matrix. According to the embodiment of the present invention, it is not necessary for all base stations to perfectly know channel information. In addition, a feedback overhead is not high, and complexity is low.04-21-2011
20110026575Method and Apparatus For Enhanced Performance and Crosstalk Measurement in a MIMO Communication System - The present invention comprises a system and method for reduction of the influence of crosstalk, increase in and control over quality of service, increase in stability and reduction of power use in a system having multiple transmission lines. A novel crosstalk measurement method is introduced. Knowing the crosstalk, various algorithms may be employed, for example to reduce or eliminate its effects in order to guarantee a bit error rate equal to or less than the maximum allowed for each line. Similar methods are provided to minimize power consumption, or maximize related measures of line performance. Systems, devices, methods and techniques are provided that allow communication system to adapt transmission power margin, power spectral densities, and the like dynamically to changing subscriber's application needs in MIMO systems.02-03-2011
20120002710FIXED STATION RECEIVER FOR MIMO COMMUNICATION SYSTEMAND UPLINK ADAPTATION METHOD THEREOF - Provided are a fixed station receiver for a Multi-Input Multi-Output (MIMO) communication system and an uplink adaptation method thereof. In the uplink adaptation method, a sounding reference signal (SRS) is received from a terminal including a plurality of transmission antennas. A complex channel matrix (H) corresponding to a channel response and a noise variance (σ01-05-2012
20120207200REDUCING STEADY STATE ERROR IN FIXED POINT IMPLEMENTATIONS OF RECURSIVE FILTERS - One feature includes a method for implementing a fixed point recursive filter that reduces or eliminates steady state error. The method comprises obtaining a first filter state value, processing the first filter state value to remove a scaling factor to obtain a second filter state value, ascertaining that the recursive filter has reached a steady state, determining a nonlinear drift parameter based on a difference between the first filter state value and the second filter state value multiplied by the scaling factor, and adjusting the second filter state value with the nonlinear drift parameter to reduce steady state error of the recursive filter. Ascertaining that the recursive filter has reached the steady state may include determining that a filter output value at time n is equal to a filter output value at time n−1.08-16-2012
20080279269SYSTEMS AND METHODS FOR LOOP TERMINATION DETECTION BASED ON PER-PORT CALIBRATION - Systems and methods for performing loop termination are described. One embodiment is a method that comprises receiving a per-port calibrated echo signal of a loop under test, receiving a region designation and a loop length for the loop under test, and determining whether the loop is terminated by a short or open termination based on phase of the per-port calibrated echo signal.11-13-2008
20120250751Variable Size Codebook for MIMO System - In a method of selecting a codebook for precoding a wireless transmission signal, a characteristic of a wireless communication channel is measured, and a codebook size is selected using (i) an expected throughput for each of a plurality of different codebook sizes given the measured characteristic of the wireless communication channel, and (ii) channel overhead associated with each of the plurality of different codebook sizes. Based on matrix selection criteria, a best matrix is selected from a codebook of the selected codebook size, and an indicator of the selected matrix is transmitted.10-04-2012
20090135893Method and System for Weight Determination in a Spatial Multiplexing MIMO System for WCDMA/HSDPA - Certain aspects of the method may comprise generating models for a received plurality of spatially multiplexed communication signals for multiple channels from a plurality of transmit antennas. A calculated signal to noise ratio (SNR) of each multiple channel may be maximized based on the generated models. A phase and an amplitude of at least a portion of the received plurality of spatially multiplexed communication signals may be adjusted based on a plurality of amplitude and phase correction weights determined from the maximized SNR.05-28-2009
20090135892APPARATUS AND METHOD FOR MEASURING CARRIER-TO-INTERFERENCE-AND-NOISE RATIO OF LOGICAL BAND USING DOWNLINK PREAMBLE - Provided are an apparatus and method for measuring a carrier-to-interference-and-noise ratio (CINR) using down-link preambles. More particularly, provided are an apparatus and method that measure CINRs according to a plurality of logical bands in a downlink band-adaptive modulation and coding (AMC) channel mode zone using preambles and determine whether or not to switch to another channel mode or logical band on the basis of the CINRS. According to the apparatus and method, it is possible to easily measure a plurality of CINRs and switch to a better channel mode or another logical band using the measured CINRs. Consequently, the optimum channel environment can be maintained.05-28-2009
20120269250PEER DISCOVERY IN A WIRELESS WIDE AREA NETWORK SYSTEM - A method of wireless communication of a wireless device includes receiving a signal indicating WWAN resources that can be utilized for communicating peer discovery signals. In addition, the method includes communicating an OFDM peer discovery signal in the WWAN resources. A method of wireless communication of a base station includes transmitting a signal to a wireless device indicating WWAN resources dedicated for a silence interval that can be utilized for communicating peer discovery signals. The WWAN resources dedicated for a silence interval include a first subset of resources and a second subset of resources. The method further includes measuring noise in the first subset of resources and refraining from measuring noise in the second subset of resources.10-25-2012
20120269251METHOD AND APPARATUS FOR ESTIMATING SIGNAL TO NOISE RATIO IN WIRELESS COMMUNICATION SYSTEM - There is provided a method and apparatus for estimating a signal to noise ratio (SNR) in a wireless communication system. The apparatus selects a preamble signal for each of a plurality of sectors from a reception signal experienced by fast Fourier transform (FFT), outputs a correlation signal by performing a correlation between the preamble signal for each sector and a preamble reference signal, estimates power of the reception signal and noise power for each sector based on the correlation signal, selects a minimum value from among the noise powers for the sectors, outputs a net power for each sector by subtracting the minimum value from the power of the reception signal for each sector, and calculates the SNR by dividing the net power for each sector by the minimum value.10-25-2012
20120106614SYSTEM AND METHOD FOR CHANNEL INTERPOLATION - A system and method for channel interpolation in a wireless device. In one embodiment a wireless device includes a channel estimator. The channel estimator is configured to generate estimated channel coefficients for a wireless channel over which the wireless device receives a packet. The channel estimator includes an interpolation filter. The interpolation filter is configured to provide interpolated channel coefficients for a plurality of non-pilot sub-carriers. The interpolated channel coefficients are based on pilot sub-carriers of non-preamble symbols.05-03-2012
20120300827Method and Apparatus Reporting Channel Quality Indicator of Communication System - The present invention provides a method and apparatus reporting a channel quality indicator of a communication system, including: detecting a first measurement reflecting a first communication quality of the communication system; providing a series of thresholds and mapping functions, each mapping functions in association with a bin defined by two adjacent thresholds, so the first measurement is mapped to the channel quality indicator by the mapping function in association with the bin which matches the first measurement; and updating at least one of the thresholds according to a second measurement which reflects a second communication quality of the communication system.11-29-2012
20120170635DYNAMICALLY ADJUSTED OFDM CHANNEL ESTIMATION FILTERING IN OFDM COMMUNICATIONS - Techniques for performing channel estimation in an orthogonal frequency domain multiplexing (OFDM) communications system include receiving a plurality of reference signals on a plurality of subcarriers, performing channel estimation to obtain a plurality of raw channel estimates based on the received plurality of reference signals, determining a number of raw channel estimates to be used for a channel estimate refinement and calculating a refined channel estimate using the number of raw channel estimates from the plurality of raw channel estimates.07-05-2012
20120170636METHOD AND DEVICE FOR GENERATING PRE-CODING MATRIX CODEBOOK - A method and a device for generating a precoding matrix codebook used in a multi-antenna communication system that includes determining an initial precoding matrix codebook consisted of L precoding matrixes; dividing a channel set into L channel groups being in one-to-one correspondence to the precoding matrix of the initial precoding matrix codebook; selecting a precoding matrix which optimally matches the channel group, from the precoding matrix universal set, to form a new precoding matrix codebook; judging whether the initial precoding matrix codebook and the new precoding matrix codebook are same; adopting the new precoding matrix codebook as the initial precoding matrix codebook, and if the initial and new precoding matrix codebook are not same, return to precoding; and adopting the new precoding matrix codebook as a precoding matrix codebook to be used in the multi-antenna communication system if the initial and new precoding matrix codebook are same.07-05-2012
20120314748NETWORK RECEIVER AND ADJUSTING METHOD THEREOF - A network receiver and the adjusting method thereof, the network receiver includes a first delay unit, a second delay unit, a first processing unit and an adjusting circuit. The first delay unit is for delaying a first signal received from a first transmission line to generate a delayed first signal. The second delay unit is for delaying a second signal received from a second transmission line to generate a delayed second signal. The first processing unit is for processing a difference between the delayed first signal and the delayed second signal to generate first data. The adjusting circuit adjusts the first and second delay units to have a plurality of delay amount combinations, the first processing unit generates a plurality of first data respectively corresponding to the delay amount combinations, and the adjusting circuit adjusts delay amount of the first and second delay units according to the first data.12-13-2012
20120128052CARRIER FREQUENCY ACQUISITION METHOD AND APPARATUS HAVING IMPROVED RELIABILITY FOR DETECTING CARRIER ACQUISITION OR LOSS THEREOF - A carrier signal acquisition technique is disclosed. An improved course carrier frequency offset algorithm is employed in conjunction with a conventional fine carrier frequency offset algorithm. The course carrier frequency offset algorithm estimates large offsets that are multiples of the carrier spacing that may occur at system startup. A spectral null is placed in the center of the transmit spectrum and is thereafter located in a received signal. The position of the spectral null provides an estimate of the local oscillator carrier offset. A frequency finite state machine (FSM) processes a number of metrics to ensure the reliability of the course carrier frequency offset and of transitions between acquisition and tracking modes. The frequency FSM will utilize the frequency offset (modin) generated by a MODSC algorithm provided one or more predefined thresholds are satisfied.05-24-2012
20120128051Evaluation Device for Providing a Transceiver System with Performance Information Thereof - An evaluation device is adapted for providing a transceiver system with performance information thereof. The transceiver system includes a transmitter and at least one receiver, and models a channel between the transmitter and the receiver using Nakagami distribution with a fading parameter. The evaluation device includes a signal-to-noise ratio (SNR) setting module, an error rate computing module, and an output module. The SNR setting module is operable to set an average SNR for the channel between the transmitter and the receiver of the transceiver system. The error rate computing module is operable, based upon the fading parameter, the average SNR and a number of the receiver, to compute a bit error rate over the channel between the transmitter and the receiver. The output module is operable to provide the transceiver system with the average SNR and the bit error rate as the performance information of the transceiver system.05-24-2012
20110182346APPARATUS AND METHOD FOR ESTIMATING NOISE AND INTERFERENCE POWER IN COMMUNICATION SYSTEM - An apparatus and a method for estimating a Noise and Interference (NI) power in a communication system are provided. The method includes, calculating average values of impulse responses according to ranging codes, through use of a ranging signal sequence received through a resource allocated to a ranging channel, arranging the average values of the impulse responses according to ranging codes in order of the highest value to the lowest value, and multiplying a ranging code, which corresponds to an impulse response having an (x+1)07-28-2011
20110182345METHOD AND APPARATUS FOR ADAPTING A BIT INTERLEAVER TO LDPC CODES AND MODULATIONS UNDER AWGN CHANNEL CONDITIONS USING BINARY ERASURE SURROGATE CHANNELS - The present invention relates to code-dependent bit interleavers for parallel non-uniform channels. Since the channel dependence of a given code ensemble is dominated by the mutual information between the channel input and output, the present invention proposes to simplify the analysis about the decoding behavior by using a set of surrogate binary erasure channels. The approximation of the actual channel by the surrogate BEC is established on the equivalence of bitwise capacities, which represent the mutual information between the uniformly-distributed binary input and the likelihood ratios of the effective parallel AWGN channels. Moreover, the transition of the erasure probabilities is modeled by a linear difference equation around the decoding threshold SNR, from which we can derive a necessary condition on the convergence of decoding iterations and achieve a useful guideline for the configuration of the bit interleaver.07-28-2011
20120163441FREQUENCY SELECTIVE MEASURING DEVICE AND FREQUENCY SELECTIVE MEASURING METHOD - A measuring device is provided that includes a first transformation device, a first time-quantization device and a selection device. The first transformation device implements a transformation of at least one signal into the frequency domain. The first time-quantization device subdivides at least one signal into several signals disposed in time succession. The selection device implements a selection of partial signals suitable for a measurement.06-28-2012
20120163440APPARATUS AND METHOD FOR TUNABLE WIDEBAND SOLAR RADIO NOISE MEASUREMENT - An apparatus and method for tunable wideband solar radio noise measurement is provided. Accordingly, it is possible to directly measure the absolute flux of solar radio waves in a desired frequency band using a tunable receiver, and accordingly, to protect radio communication broadcasting systems located on the earth from its damage caused due to radio burst, noise and the like.06-28-2012
20090060014SYSTEM AND METHOD FOR AUTOMATED LINK QUALITY MEASUREMENT FOR ADAPTIVE MODULATION SYSTEMS USING NOISE LEVEL ESTIMATES - A communications system includes a transmitter that transmits a modulated signal having encoded communications data over a communications channel. The transmitter adjusts one of at least modulation and coding at the transmitter based on the received channel state information of the transmitted signal. A receiver determines received signal metrics from the modulated signal. A noise power estimator estimates the noise power of the received communications signal by collecting N data samples from the communications signals, forming a covariance matrix of the N data samples based on a model order estimate, computing the eigenvalue decomposition of the covariance matrix and ranking resultant eigenvalues from the minimum to the maximum for determining the noise power of the received signal. At least one of modulation and coding are adjusted based on the monitored link quality of the communications channel to enhance use of the available channel capacity.03-05-2009
20120257666METHOD FOR DETERMINING NOTCHING PARAMETERS IN A PLC SYSTEM AND PLC SYSTEM - A method for determining notching parameters for a PLC (Power Line Communication) Signal in a PLC system, where, by notching in a targeted fashion, frequency ranges are omitted in the PLC signal and the notching parameters are selected such that any interference of the PLC signal with a radio signal is largely avoided, is characterized with regards to the determination of notching parameters even during operation of the PLC system such that, at least for a section of the PLC signals, a signal-interference ratio (SIR) is formed which, depending on the SIR, assesses the signal strength of a radio signal and, based on the assessment notching parameters, are determined or adjusted. A respective PLC system is provided.10-11-2012
20090116544Performance-based link adaptation techniques using throughput indicator - A multiple carrier wireless communications system includes a channel predictor, a performance predictor, and a link adapter. The channel predictor predicts channel state information for a next packet based on channel state information for the current packet. The performance predictor includes an uncoded performance predictor to predict system performance at a decoder input based on a modulation type and the predicted channel state information for the next packet, and a decoder input-output performance mapper to predict system performance at a decoder output based on a coding rate and the predicted system performance at the decoder input. The link adapter includes a link throughput controller to generate a throughput indicator based on a requested system performance and the predicted system performance at the decoder output, and a modulation and coding scheme (MCS) updater to identify a MCS based on the throughput indicator.05-07-2009
20100272167Method and Apparatus for Simplifying a Probabilistic Rate Adaptation Procedure in a Wireless Communication System - The present invention provides a method for simplifying a probabilistic rate adaptation procedure in a wireless communication system, which comprises calculating a conditional probability density function of SNR of a transmitted signal by the probabilistic rate adaptation procedure, to generate an SNR estimation result, taking logarithm on the SNR estimation result to generate a logarithm result, and partitioning SNR values into a plurality of regions according to the logarithm result, to generate a discrete function from the SNR estimation result.10-28-2010
20120257664Method for Improving Multiuser MIMO Downlink Transmissions - A method for improving multiple-input multiple-output MIMO downlink transmissions includes obtaining a channel state information CSI report including preferred matrix index PMI for precoding, channel quality index CQI and rank index RI at a base station from user terminals through a channel feedback; applying selectively a signal-to-interference-plus-noise-ratio SINR offset to a SINR of said CSI report; applying selectively a rate matching responsive to SINR offset or the CSI report; and controlling or adjusting the SINR offset.10-11-2012
20120257665COMPLEX CONDITION DETERMINATION UNIT, TRANSMISSION DEVICE, COMPLEX CONDITION DETERMINATION METHOD - Disclosed is a complex condition determination unit which, to solve the problem of making it possible to change a modulation scheme adapted to rapid changes in line status, is provided with; an error-pulse switching determination means which outputs, as error-pulse determination information indicating whether an accumulated value of the number of error pulses accumulated over a predetermined period is equal to or greater than a predetermined error-pulse threshold value, the error pulses indicating whether an error exists in a received signal; a CNR (carrier-wave power to signal power ratio) modulation scheme determination means which outputs, as CNR determination information, a modulation scheme determined in accordance with a predetermined CNR threshold value and CNR information indicating the CNR of the received signal; an RSL (receive signal level) modulation scheme determination means which outputs, as RSL determination information, a modulation scheme determined in accordance with a predetermined RSL threshold value and RSL information indicating the RSL of the received signal; and a complex modulation scheme determination means which determines the modulation scheme used in order to modulate the transmission source of the received signal, in accordance with the error-pulse determination information, the CNR determination information, the RSL determination information, and received modulation scheme information indicating the modulation scheme of the received signal.10-11-2012
20120263221Method And Apparatus For Determining Signal-To-Noise Ratio - In one embodiment, the method includes despreading the received signals by applying an unused channelization code, determining noise power based on output of the despreading, and determining a signal-to-noise ratio, SIR, based on the noise power and at least one of the received signals.10-18-2012
20090016420APPARATUS AND METHOD FOR MEASURING CARRIER TO INTERFERENCE AND NOISE RATIO - Provided are an apparatus and method for measuring a carrier-to-interference and noise ratio (CINR) using a pilot symbol in a digital communication system, and more particularly, to an apparatus and method for measuring a CINR by estimating a data signal, noise, and an interference signal from a pilot symbol in a digital communication system using orthogonal frequency division multiplexing (OFDM)/orthogonal frequency division multiplexing access (OFDMA). The apparatus includes: a pilot symbol acquisition unit for acquiring the pilot symbol from a baseband frequency signal; a signal estimation unit for estimating a pilot signal and a data signal from the pilot symbol; a power calculation unit for calculating a power value of the estimated data signal and calculating a power value of a noise signal from a difference between the pilot symbol and an estimated pilot signal; and a CINR calculation unit for calculating a CINR on the basis of the power values of the data and noise signals. Thus, a pilot symbol is used for more easily and precisely measuring a CINR of a received signal, and scheduling of a base station and transmission power control of a terminal are performed on the basis of the measured CINR.01-15-2009
20120327992RECEIVER AND METHOD OF RECEIVING SIGNAL FOR REDUCING INTERSYMBOL INTERFERENCE - A synchronization method for a receiver includes generating, by a beacon detector, an operating signal by performing a logic operation on a baseband signal, and calculating, by a coarse sync block, a coarse FFT window start position value where a signal-to-noise ratio becomes maximized by estimating a noise level of the operating signal.12-27-2012
20120230380METHOD FOR DETERMINING BEAMFORMING PARAMETERS IN A WIRELESS COMMUNICATION SYSTEM AND TO A WIRELESS COMMUNICATION SYSTEM - A method for determining a beamforming vector or a beamforming channel matrix in a communication system including a transmitting station and a receiving station, and a communication system are described. The transmitting and receiving stations include respective antenna groups and respective codebooks include a plurality of predefined beamforming vectors for the antenna group.09-13-2012
20110122937METHOD AND DEVICE FOR SNR MEASUREMENT AND COMMUNICATION SYSTEM COMPRISING SUCH DEVICE - A method and a device enable signal-to-noise (SNR) measurement. The system includes the following steps: (i) at least one first network component transmits bursts to at least one second network component, wherein each burst comprises several sub-carriers or tones; and (ii) a third network component performs an SNR measurement for the bursts. In addition, a communication system with such a device is described.05-26-2011
20100329320Noise detection method, noise detection apparatus, simulation method, simulation apparatus, and communication system - For voltage values (observed noise sequence) in an electronic power line (communication medium) which are obtained at a predetermined interval, initial values of noise characteristics based on a statistic of the observed noise sequence itself are decided by a moment method (S12-30-2010
20080298451APPARATUS AND METHOD FOR ESTIMATING CARRIER-TO-INTERFERENCE AND NOISE RATIO IN A COMMUNICATION SYSTEM - An apparatus and method for estimating a Carrier-to-Interference and Noise Ratio (CINR) in a communication system are provided. In the apparatus and method a signal having a traffic allocation available area that includes a preamble allocation available area is generated by Fast Fourier Transform (FFT)-processing a received symbol, power values of preamble tones included in the preamble allocation available area are calculated, a carrier power value is calculated using the power values of the preamble tones, a partial noise-interference power value is calculated using power differences between the preamble tones and power values of remaining tones other than the preamble tones, a noise power value is calculated using power values of tones included in a noise power estimation area being an area except for the preamble allocation available area in the traffic allocation available area, and the CINR is calculated using the carrier power value, the partial noise-interference power value, and the noise power value.12-04-2008
20080298449Method and an apparatus for measuring error vector magnitude, and a measuring apparatus or signal source evaluated or assessed by this method - At least one property of a measuring apparatus that is different property from the error vector magnitude is measured, or a previously measured value or a predetermined value of the at least one property is prepared; based on the measured value or specification value of each of the at least one property, each corresponding noise power within a specific frequency range is found; and the error vector magnitude is calculated based on the noise power.12-04-2008
20110002371System and method for adjusting DIDO interference cancellation based on signal strength measurements - A machine-implemented system and method are described for removing interference between adjacent distributed-input-distributed-output (DIDO) clusters comprising. For example, a method according to one embodiment comprises: detecting signal strength at a first client from a main DIDO cluster; detecting interference signal strength at the first client from an interfering DIDO cluster; if the signal strength from the main DIDO cluster reaches a specified value relative to the value of the interference signal strength from the interfering DIDO cluster, then generating channel state information (CSI) defining channel state between one or more antennas of the first client and one or more antennas of the interfering DIDO cluster; transmitting the CSI from the first client to a base transceiver station (BTS) in the interfering DIDO cluster; and implementing DIDO precoding with inter-DIDO-cluster interference (IDCI) cancellation at the BTS in the interfering DIDO cluster to avoid RF interference at the first client.01-06-2011
20080298450Frequency Band Adaptive Wireless Communication - A system, apparatus and method is disclosed for multiband wireless communication. Frequency bands and/or transmission formats are identified as available within a range for wireless communication. Signal quality metrics for each frequency band are evaluated by a receiver to identify qualified frequency bands. The qualified frequency bands can be ranked according to one or more signal quality metrics, where the list of qualified bands can be communicated to a transmitter. The transmitter is arranged to evaluate the list of qualified bands and select a communication method based on the available frequency bands and a selected communication optimization scenario. Multiple frequency bands and communication methods can be utilized by the transmitter such that a combination of licensed, unlicensed, semilicensed, and overlapped frequency bands can be simultaneously used for communication. The receiver continually monitors communications and can report link performance to the transmitter for adaptive control of the selected communication methods.12-04-2008
20090201980METHOD AND DEVICE FOR ESTIMATING A GAUSSIAN WHITE NOISE POWER IN A CHANNEL, AND RECEIVER - A method and device for estimating a Gaussian white noise power in a channel and a receiver are provided. The method includes performing a multi-path search on a received signal to find out paths of the signal; performing a noise estimation on one of the paths to acquire a total noise power of the path; performing an inter-path interference noise estimation on N paths spaced apart from the path by an integral number of chips to obtain an inter-path interference noise power of a single path of the signal, where N is an integer greater than or equal to 1; and subtracting the inter-path interference noise power from the total noise power to obtain the Gaussian white noise power. Through the technical solution of the disclosure, the Gaussian white noise power in a channel is obtained with a higher accuracy, so that the performance of equalization is enhanced.08-13-2009
20100232490METHOD AND APPARATUS FOR COMPENSATING A MODULATION IMBALANCE EFFECT IN A COMMUNICATION DEVICE - A method and apparatus for compensating a modulation imbalance effect in a communication device. In one embodiment, at least three sets of modulation imbalance parameters (MIPs) are estimated by executing an auto balance sequence. The at least three sets of MIPs correspond to a baseband signal configured to have at least three configurable frequencies, each of the at least three sets of MIPs corresponds to one of at least three configurable frequencies. The auto balance sequence is configured to provide an offset signal generated within a communication device to trigger generation of each one of the at least three configurable frequencies. The at least three sets of MIPs are filtered to select a filtered set. The modulation imbalance effect is compensated by using the filtered set to reduce distortion of the baseband signal in the communication device.09-16-2010
20120320962Diversity Reception Device - The diversity reception device includes an antenna switching unit configured to select and switch to a determined chain number of antennas out of a plurality of antennas; and an antenna interchange control unit configured to control the antenna switching unit to interchange an antenna. The antenna interchange control unit compares a carrier-to-noise ratio measured by a demodulation circuit of a demodulation unit of each chain, controls the antenna switching unit to sequentially switch connection with an antenna of a chain having a lowest carrier-to-noise ratio to connection with antennas connectable to the chain, and interchanges the antenna of the chain having a lowest carrier-to-noise ratio with an antenna estimated to have a highest carrier-to-noise ratio on the basis of the input level measured by the level detection unit or an antenna having a highest input level measured by the level detection unit among the connection-switched antennas.12-20-2012
20120320961CHANNEL ESTIMATION FOR OFDM SYSTEMS - A device for performing channel estimation in an OFDM system includes a non-volatile memory, a G matrix selector and a channel estimate generator. The non-volatile memory stores a set of G matrices indexed by signal to noise ratio, the G matrices being precalculated for a plurality of signal to noise ratios using a fixed Doppler frequency and a fixed delay spread. The G matrix selector uses a quantised signal to noise ratio to select a G matrix from the set of G matrices stored in the non-volatile memory. The channel estimate generator multiplies the selected G matrix by LS estimates for the reference signal to obtain a channel estimation.12-20-2012
20100208785Method for Determining Automatically a Fext/Next Transfer-Function - A method of automatically determining a far-end crosstalk (FEXT) and near-end crosstalk (NEXT) transfer function in communication lines such as Digital Subscriber Lines (DSL). In a first phase, an input test signal with a known power density spectrum (PSD) covering a frequency range of interest is transmitted at the near end of line A while a received signal or noise-related quantity or PSD is measured at both the near end and far end of line B. In a second phase, transmission of the test signal is stopped, and a received signal or noise-related quantity or PSD is again measured at both ends of line B. In a third phase, the FEXT/NEXT transfer function is determined based on the measurements of the first and second phases.08-19-2010
20090097536MULTI-CHANNEL DATA DETECTION PHASE LOCKED LOOP FREQUENCY ERROR COMBINATION LOGIC - Frequency error combination for a multi-channel data detection system with a phase locked loop for each channel, comprises receiving frequency error information with respect to each channel; combination logic configured to combine the received frequency error information and generate a combined phase error, weighting the received frequency error information from each channel; and a frequency error output configured to apply the combined frequency error to at least one channel phase locked loop.04-16-2009
20100202503Method and Apparatus for Determing a Quantized Channel Vector - A method for determining a quantized channel vector in a terminal of a Multiple Input Multiple Output communication system includes determining a channel quality of a channel between a base station and the terminal and determining the quantized channel vector from a plurality of quantized channel vectors based on the determined channel quality. The determined quantized channel vector provides a predefined channel property value.08-12-2010
20130170533Coordinated Multi-Point Transmission - In a multiple-input multiple-output (MIMO) wireless system supporting Coordinated Multi-Point (CoMP) transmission and having a first base station, a second base station, and a user equipment, a communications method implemented in the first base station is disclosed. In an aspect, the communications method includes exchanging, with the second base station through local information exchange, first information about a first channel between the first base station and the user equipment and second information about a second channel between the second base station and the user equipment, and computing at least one of a precoding matrix, a receiver filter, and a projection matrix, wherein the user equipment estimates the first information and the second information, and shares the first information and the second information with the first base station. Other apparatuses and some methods for wireless communications also are disclosed.07-04-2013
20080240217Cinr Estimating Method and Device Using Preamble in Ofdm - A device and method for estimating a carrier to interference-plus-noise ratio (CINR) in an OFDM system are provided. The CINR estimating method includes (a) receiving a preamble symbol and transmit subcarrier transmitted from a base station; (b) calculating an interference power and noise power using the preamble symbol and transmit subcarrier; (c) calculating a receive power used for the base station to transmit a preamble and data symbol; (d) estimating a preamble CINR value using an interference power, a noise power, and a receive power; (e) calculating the noise power from a subcarrier not transmitting a preamble; and (f) calculating an average CINR of data subcarriers using the preamble CINR value and the noise power. With such a method, a precise carrier to interference-plus-noise ratio (CINR) can be estimated using a preamble when the preamble power is amplified in comparison with the data symbol power, the subcarriers are differently applied for the respective cells, and the traffic of the data area is partially loading.10-02-2008
20080240216Link adaptation method - A method, where data is transmitted from a network node to user equipment in a succession of communication frames. An estimate indicative of the quality of the user equipment transmission channel in a reference communication frame is ascertained, and modified by an amount that varies in dependence on a configuration of the resources allocated to the user equipment in the reference communication frame. The modified estimate is used in selecting one or more connection parameters for a data transmission in a target communication frame. This improves the adaptation of the transmission parameters to the existing channel conditions10-02-2008
20080225934METHOD FOR DETERMINING A CORRECTED VARIANCE REPRESENTATIVE OF THE CONDITION OF RECEPTION OF SIGNALS REPRESENTATIVE OF SYMBOLS - The present invention concerns a method for determining a corrected estimated variance representative of the condition of reception of signals representative of symbols transferred by an emitter to a receiver through a communication channel, wherein the method comprises the step, executed by the receiver, of producing an estimation of the variance by a Wiener channel estimator comprising a linear filter of which coefficients are determined at least from a given average signal to interference plus noise ratio value, the method being characterised in that it comprises farther step, executed by the receiver, of: 09-18-2008
20130177062TRANSMITTER, CONTROL METHOD, COMPUTER PROGRAM AND DELTA-SIGMA MODULATOR - In order to improve radio characteristic in a transmitter, there are included a ΔΣ modulation means that ΔΣ modulates a given input signal; and a control means that changes parameters of the ΔΣ modulation means in accordance with a given condition.07-11-2013
20130101008SYSTEMS AND METHODS FOR DOWNLINK SCHEDULING IN MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS COMMUNICATIONS SYSTEMS - Systems and methods for downlink scheduling in wireless communications systems are described. In some embodiments, a method includes: applying channel prediction at a transmitter for transmitting information to one or more mobile devices; predicting channel state information for a channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction; determining a precoding matrix to apply to the information, the determining the precoding matrix being based, at least, on predicted channel state information; and scheduling transmission of the information to the one or more mobile devices based, at least, on an asymptotic ergodic rate for the one or more mobile devices. The asymptotic ergodic rate can be based on large-scale channel behavior and a maximum Doppler shift between the mobile devices.04-25-2013
20130101007Systems and Methods for Channel Estimation of MoCA Signals - Systems and methods are provided, for estimating a channel based on previous channel estimations from the same source. Embodiments disclosed herein enable removal of the timing variation (from burst to burst) so that the channel can be more accurately estimated. Embodiments provide several systems and methods for averaging channel estimation information from each of the bursts. The systems and methods disclosed herein advantageously improve channel estimation accuracy and reduce modulation error.04-25-2013
20130121393CHANNEL ESTIMATION WITH DECISION FEEDBACK - Systems, methods, and other embodiments associated with a method for estimating a channel between a wireless transmitter and a wireless receiver are described. According to one embodiment, a method includes receiving a signal that includes non-pilot data that is not known to a receiver of the signal; determining an estimated channel for the signal based, at least in part, on the non-pilot data; processing the signal based, at least in part, on the estimated channel to produce an equalized signal; and decoding the equalized signal to produce output data.05-16-2013
20100296565Constant False Alarm Rate Robust Adaptive Detection Using the Fast Fourier Transform - A signal detection apparatus includes electronics configured to receive an RF input and to process the RF input applying a decision rule that is a normalized quantity to determine if a man-made signal is present or if only noise is present while achieving a constant false alarm rate.11-25-2010
20120020403MULTI-ANTENNA SCHEDULING SYSTEM AND METHOD - A wireless communication method and system using virtual MIMO (“V-MIMO”) are provided. Post processing signal to interference and noise ratios (“SINR”) for a plurality of signals corresponding to a plurality of mobile terminals arranged as a V-MIMO group are estimated. The one of the plurality of mobile terminals having the highest post processing SINR is selected. Wireless communication for the selected mobile terminal is scheduled. The signal corresponding to the selected mobile terminal is cancelled. Post processing signal to interference and noise ratios (“SINR”) for the signals corresponding to the remaining mobile terminals is re-estimated. The one of the remaining mobile terminals having the highest post processing SINR is selected. Wireless communication for the selected remaining mobile terminal is scheduled.01-26-2012
20120020402RECEIVER - An embodiment of the invention relates to a method of determining an optimum sequence of algorithms, wherein each algorithm defines a receiver function of a receiver, which has a plurality of receiver functions and which is adapted to receive bits sent by a transmitter.01-26-2012
20130195164SYSTEMS AND METHODS FOR ENHANCING AUDIO QUALITY OF FM RECEIVERS - Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, a stop band noise signal is extracted from an L+R or L−R signal produced by an FM stereo decoder. A channel quality measure is calculated based on the stop band noise signal and is used to control whether a pop suppression technique is applied to the L+R signal. The channel quality measure and the stop band noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on the L−R signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation.08-01-2013
20130195163SYSTEMS AND METHODS FOR ENHANCING AUDIO QUALITY OF FM RECEIVERS - Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, quadrature L−R demodulation is applied to a composite baseband signal output by an FM demodulator to obtain an L−R noise signal. A channel quality measure is calculated based on the L−R noise signal and is used to control whether a pop suppression technique is applied to an L+R signal obtained from the composite baseband signal to detect and remove noise pulses therefrom. The channel quality measure and the L−R noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on an L−R signal obtained from the composite baseband signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation.08-01-2013
20130202020METHOD OF GENERATING INTERFERENCE SIGNALS AND DEVICE TO CARRY OUT SUCH A METHOD - A method for generating interference signals and a device to carry out said method, in which an interference signal (08-08-2013
20120082200METHOD AND APPARATUS FOR MEDIUM ACCESS CONTROL IN A WIRELESS BROADBAND SYSTEM WITH MULTIPLE-INPUT MULTIPLE-OUTPUT OR MULTIPLE-INPUT SINGLE-OUTPUT TECHNOLOGY WITH MULTIUSER CAPABILITIES - Method and apparatus for medium access control in a wireless broadband system with multiuser MIMO/MISO technology comprising the steps of a transmitter (Tx) broadcasting a polling message (04-05-2012

Patent applications in class Signal noise