Entries |
Document | Title | Date |
20080225936 | FREQUENCY DOMAIN EQUALIZATION FOR TIME VARYING CHANNELS - Systems and methods for a wireless communication system are provided. The method includes estimating a time-variation of a channel through which the wireless communication system transmits. This also includes decreasing the estimated time-variation of the channel from a signal transmitted by the wireless communications system. | 09-18-2008 |
20080232450 | METHOD AND APPARATUS FOR ROBUST FREQUENCY EQUALIZATION - In frequency equalization, a received signals goes through frequency transform, the transformed signal is divided by a frequency transform of a channel response a method for equalization. The method comprises the step of: adjusting a quotient of the division by a weight function, wherein the function varies under a set of conditions; whereby for a frequency selective channel, deep fades are adjusted, and noise or interference are reduced. | 09-25-2008 |
20080310491 | MULTI-MODE TRANSMITTER - A multi-mode transmitter within an integrated circuit device. The multi-mode transmitter transmits a first data sequence in a baseband signal when a first transmission mode is enabled, and transmits the first data sequence in a multi-band signal when a second transmission mode is enabled. | 12-18-2008 |
20090052513 | Data Processing Method, Equalizer, Receiver, Communication System, Network Element, and Terminal Using Simplified Channel Matrix Inversion - The invention is related to a communication terminal, comprising: means ( | 02-26-2009 |
20090060018 | Transmit Equalizer For Dispersive Channels - An equalizer at the transmitter reduces data-dependent jitter introduced by a non-linear device in the transmitter. In one implementation, the equalizer is T/2-spaced. In an alternate implementation, it is T-spaced. | 03-05-2009 |
20090080506 | RECEIVER EMPLOYING NON-PILOT REFERENCE CHANNELS FOR EQUALIZING A RECEIVED SIGNAL - In one embodiment, a receiver has a reference generator and a main equalizer. The reference generator equalizes a received signal using one or more pilot reference signals. Then, the reference generator decodes one or more predetermined data channels of the equalized signal, makes hard decisions on the data of each decoded channel, and regenerates the original coding sequence of each decoded channel. The main equalizer uses each re-encoded channel as an additional reference signal along with one or more pilot signals to equalize a time-delayed version of the received signal. In alternative embodiments, the receiver might also have a step-size generator which selects optimum step sizes from a look-up table based on the number of re-encoded channels and the power of those channels. The step size is then used by the main equalizer along with the re-encoded channels to equalize the time-delayed received signal. | 03-26-2009 |
20090196335 | SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD UTILIZED IN COMMUNICATION SYSTEM - The present invention provides a signal processing device and a signal processing method utilized in a communication system, wherein the communication system includes at least a channel. The signal processing device includes an analog-to-digital converter (ADC), a first adding unit, a feed forward equalizing unit, a data slicing unit, a second adding unit, an infinite impulse response (IIR) compensating unit, and an interference eliminating unit. The signal processing device and the signal processing method thereof disclosed in the present invention can utilize the IIR compensating unit to solve an error distortion problem in the communication system so as to improve the whole efficiency. | 08-06-2009 |
20090219981 | MINIMUM MEAN SQUARE ERROR EQUALISER WITH REDUCED COMPLEXITY - The present invention relates to the field of communication devices, e.g. wireless communication devices. More particularly, the present invention relates to the field of signal equalisation, especially minimum mean square error equalisation. The present invention especially relates to an equaliser for a communication device, a method of equalising one or more received signals and a software program product for carrying out the method. The present invention reduces the size of a look-up table needed for a division operation and, generally, provides for a reduced complexity of the equaliser and receiver. The equaliser for a communication device comprises a filter calculator for determining a channel power value based on one or more channel response values and selecting one of two or more equaliser structures based on said channel power value and based on at least one threshold value for separating the channel power values into at least two ranges; and a filter for equalising one or more received signals according to the selected equaliser structure. Advantageously, at least one of said equaliser structures corresponds to an, at least approximated, minimum mean square error equaliser structure or to an, at least approximated, suboptimal minimum mean square error equaliser structure. | 09-03-2009 |
20090238257 | LONELY PULSE COMPENSATION - An apparatus comprising a transmission line, a receiver circuit, and a high pass filter circuit coupled between the transmission line and a receiver circuit input. The receiver circuit is configured to receive a data signal over the transmission line at a first data rate. The high pass filter circuit is connected between the transmission line and a receiver circuit input and has a corner frequency that is less than approximately the first data rate and is greater or equal to than approximately one-half the second data rate. The second data rate is an effective data rate caused by an expected data pattern on the transmission line. Other devices, systems, and methods are disclosed. | 09-24-2009 |
20090257483 | DUAL CORRELATION FRAME SYNCHRONIZATION SYSTEM AND METHOD - A system and method utilize a dual correlation, one for the synchronization pattern (sync correlation) and one for the channel equalization pattern (CE correlation), to determine where the channel equalization pattern starts and thus establish frame synchronization. The system and method compare the two correlations and decides on the start of the channel equalization symbols when the CE correlation is larger than the sync correlation. | 10-15-2009 |
20090262794 | DIGITAL TRANSMITTER - An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer. | 10-22-2009 |
20090274205 | System and Method for Anticipatory Receiver Switching Based on Signal Quality Estimation - In various embodiments, a first and second complex multiplier may be configured to receive an input signal and provide a baseband I component signal and a baseband Q component signal, respectively. A first and second filter may be configured to filter the baseband I component signal and the baseband Q component signal, respectively. An equalizer may be configured to equalize the filtered baseband I component signal and the filtered baseband Q component signal. A carrier recovery portion may be configured to generate a reference signal based on the equalized filtered baseband I component signal and the equalized filtered baseband Q component signal. A first and second multilevel comparator may be configured to receive the equalized filtered baseband I component signal from the carrier recovery portion and provide an output I and receive the equalized filtered baseband Q component signal and provide an output Q signal for further modulation. | 11-05-2009 |
20100034251 | ESTIMATION OF SYMBOLS OF TRANSMITTED SIGNALS USING HYPOTHESES - A method of estimating a symbol that has been transmitted into a channel connecting a modulator for producing modulation symbols and an equaliser, wherein a channel estimate describes said channel and the method comprises: calculating a metric for each of a number of hypotheses of a sequence commencing with the symbol under estimation followed by a number of subsequently transmitted symbols, each symbol in the sequence occupying a respective node of the sequence; and deeming the symbol at the beginning of the hypothesis that has the best metric to be the symbol under estimation; wherein calculating a metric for a given hypothesis comprises: calculating a discrepancy metric at each node of the given hypothesis; and combining the discrepancy metrics of nodes in the given hypothesis to produce the metric; and wherein a discrepancy metric for a given node of a given hypothesis is an assessment of the difference between: a sample received from said channel at a time point corresponding to said given node; and a sample that would be received at that time point if said channel estimate were acting on a model signal comprising the symbols of the given hypothesis up to the given node preceded by any estimates of symbols transmitted into the channel immediately prior to said time point as may be required to fill the estimated channel. The invention also relates to corresponding apparatus. | 02-11-2010 |
20100054320 | AMPLITUDE EQUALIZER FOR FM TRANSMITTERS - An improved amplitude equalizer for FM transmitters that compensates for undesirable frequency response characteristics in an audio source or in an FM receiver. In a preferred embodiment, the amplitude equalizer includes a pre-emphasis network including a set of components that can be selectively switched in and out of the network so that a transmitter operator may select the type of pre-emphasis most appropriate to the audio source for the transmitter and the system that demodulates and reproduces the audio signals transmitted. | 03-04-2010 |
20100142605 | COMMUNICATIONS DEVICE INCLUDING A FILTER FOR NOTCHING WIDEBAND TRANSMIT SIGNALS AND ASSOCIATED METHODS - A communications device includes a modulator and a filter downstream therefrom and operable to generate an output wideband complex signal with a frequency notch therein. The filter includes a finite impulse response (FIR) filter with L taps to generate N output values, with L>N. A Fast Fourier Transform (FFT) block is downstream from the FIR filter and has a length N so that filter transition regions occur between frequency bins of the FFT block. A notching block is downstream from the FFT block to generate the frequency notch. An Inverse Fast Fourier Transform (IFFT) block is downstream from the notching block and has the length N. | 06-10-2010 |
20100238991 | EQUALIZATION BY THE PULSE SHAPE INVERSE OF THE INPUT TO THE FRI PROCESSING IN PULSE BASED COMMUNICATIONS - Certain aspects of the present disclosure relate to a method for equalizing a pulse signal corrupted by a noise and by various channel effects for obtaining a signal based on the periodic-sinc pulse, which is suitable for Finite Rate of Innovation (FRI) processing applied at a receiver of a pulse-based communication system (e.g., an Ultra-Wideband receiver). | 09-23-2010 |
20100296569 | DIGITAL DEMODULATING APPARATUS FOR TIMING ERROR DETECTION - The invention discloses a digital demodulating apparatus for timing error detection, including a numerically controlled oscillator, an equalizer unit, a decoder and a timing error detector. The numerically controlled oscillator generates a first sequence signal according to an input sequence signal and a timing error sequence signal. The equalizer unit equalizes the first sequence signal to generate an equalized sequence signal. The decoder decodes the equalized sequence signal to generate to generate an output sequence signal. The timing error detector generates the timing error sequence signal according to the first sequence signal and one of the equalized sequence signal and the output sequence signal. | 11-25-2010 |
20110134988 | PROGRAMMABLE SFP OR SFP+ MODULE - Various example embodiments are disclosed. According to one example embodiment, a small form factor pluggable (SFP or SFP+) module may include an equalizer and a logic controller. The equalizer may be configured to receive data, provide signal information to a logic controller based on the received data, equalize the data based on equalization instructions received from the logic controller, and transmit the equalized data. The logic controller may be configured to transmit the signal information received from the equalizer receive programming instructions provide the equalization instructions to the equalizer based on the programming instructions, receive control inputs associated with the data, and provide status outputs based on the control inputs and the programming instructions. The SFP or SFP+ module may be configured to plug into a small form factor (SFF) host connector. | 06-09-2011 |
20110142119 | Receiver circuit - A receiver circuit includes an equalizer circuit that adjusts reception intensity of an input signal based on an intensity adjustment value to generate a correction input signal; a first holding unit that holds a plurality of data items sampled based on a sampling clock for sampling values of the data items transmitted by the correction input signal in a receiving order; a second holding unit that holds a plurality of values of the correction input signal sampled based on a complementary sampling clock for sampling a boundary value of the data items in a receiving order; and an equalizer control circuit that judges the strength of reception intensity of the correction input signal based on a plurality of output signals of the first holding unit and a plurality of output signals of the second holding unit to update the intensity adjustment value based on the judgment result. | 06-16-2011 |
20110228836 | METHOD FOR IMPULSE NOISE MITIGATION - A method of noise mitigation in a multi-carrier communication system includes receiving a signal from a decision device, determining whether synchronization symbol update is enabled, updating at least one of frequency-domain equalizer (FEQ) coefficients or digital echo canceller (DEC) coefficients in synchronization symbol periods if the synchronization symbol update is enabled, determining whether data symbol update is performed if the synchronization symbol update is not enabled, determining whether a flag associated with the signal is set if the data symbol update is not performed, and updating at least one of FEQ or DEC coefficients associated with the signal in synchronization symbol periods if the flag is set. | 09-22-2011 |
20120039379 | RECEIVER APPARATUS FOR RECEIVING A MULTICARRIER SIGNAL - In time varying OFDM systems, the effect of a non-ideal time synchronization may lead to a poor performance in terms of decoded average bit error rate versus the signal-to-noise ratio. The receiver apparatus ( | 02-16-2012 |
20120069890 | LIKELIHOOD VALUE CALCULATION DEVICE, LIKELIHOOD VALUE CALCULATION METHOD, AND RADIO SYSTEM - A likelihood value calculation device includes: likelihood value calculation unit | 03-22-2012 |
20120134405 | APPARATUS AND METHOD FOR MITIGATION OF RECEIVE POWER IMBALANCE ON EQUALIZER PERFORMANCE - An apparatus and method for mitigation of receive power imbalance including estimating input power levels on two diversity receive branches in a receiver; computing a power imbalance between the two diversity receive branches and determining a weaker receive branch; setting a weakRX parameter based on the weaker receive branch; computing an intercept parameter c | 05-31-2012 |
20120300828 | TRANSMISSION SYSTEM WITH ISI CHANNEL AND METHOD OF OPERATING THEREOF - There is provided a transmission system and method of operating thereof. The method comprises: dividing a data sequence to be transmitted into a plurality of data blocks; encoding one or more data blocks with one or more linear systematic cyclic codes thus giving rise to encoded data blocks; transmitting said encoded data blocks over an ISI transmission channel; upon receiving, applying a linear integer-forcing (IF) equalization to the received data blocks; processing the output of the IF equalization thereby detecting for each encoded data block a valid codeword with maximal likelihood of decoding; and reconstructing the data blocks using the respective detected valid codewords. | 11-29-2012 |
20120307880 | MIXED-PHASE REAL TIME AUTOMATIC ROOM EQUALIZATION SYSTEM - A system is provided for determining mixed-phased real time room equalization that employs crossover filters for splitting the incoming spectrum and also re-uses the cross-over filters in the equalization filter. | 12-06-2012 |
20130107933 | LINEAR SYSTEM FOR LINK TRAINING | 05-02-2013 |
20130114662 | METHOD AND APPARATUS FOR RADIO RECEIVER EQUALIZATION - A method, apparatus and computer program product are configured to provide calibration accuracy in an analog filter. In this regard, a method is provided that includes estimating a cutoff frequency for an analog filter. The method further includes causing a filter tuning word to be modified based on the estimated cutoff frequency for the analog filter. The method also includes determining a residual cutoff frequency mismatch for the analog filter. The method also includes causing an equalizer configuration to be selected for a digital filter based on the determined residual cutoff frequency mismatch. | 05-09-2013 |
20130114663 | FLEXIBLE RECEIVER ARCHITECTURE - One embodiment relates to a receiver circuit for a data link. The receiver circuit includes at least a first signal path, a second signal path, and a path selector circuit. The first signal path includes first equalization circuitry, and the second signal path includes second equalization circuitry. The path selector circuit is configured to select one signal path of the first and second signal paths. Other embodiments and features are also disclosed. | 05-09-2013 |
20130170536 | DATA EQUALIZING CIRCUIT AND DATA EQUALIZING METHOD - A data equalizing circuit includes an equalizer configured to output data according to a control code; and a detection unit configured to divide the data into N number of calculation periods, count data transition frequencies for the N calculation periods, calculate dispersion values of the data transition frequencies for the N calculation periods, and output the control code corresponding to a largest dispersion value, in response to a counting interruption signal and a counting completion signal, wherein n is equal to or greater than 2, N is greater than n, and the data is divided to n number of unit intervals (UI), and | 07-04-2013 |
20130170537 | DATA EQUALIZING CIRCUIT AND DATA EQUALIZING METHOD - A data equalizing circuit includes an equalizer configured to control a gain of data according to a value of a control code and output a controller gain; and a detection unit configured to divide n cycles of the data into N periods, count data transition frequencies for n/N periods while changing the value of the control code, calculate dispersion values of data transition frequencies for 1/N periods of the data from the data transition frequencies for the n/N periods, and finally output the value of the control code corresponding to a largest dispersion value, wherein n is equal to or greater than 2 and is set such that boundaries of the respective n/N periods of the data have different positions in the 1 UI data. | 07-04-2013 |
20130322511 | METHOD AND APPARATUS FOR SYNCHRONIZATION OF DATA AND ERROR SAMPLES IN A COMMUNICATIONS SYSTEM - A method and apparatus for processing input data signals transmitted in a continuous mode, or in a burst mode, of signal transmission, such as in a satellite or a computer network communications system. A receiver receives input data signals and a buffer stores the received input data. Processing circuitry generates frame timing synchronization control signals for writing the frames of the input data for storage, generates timing error control signals corresponding to a processing delay for the input data, for synchronizing reading out the stored data from the buffer based on a timing difference between the timing error control signals and the frame timing synchronization control signals to adjust for an arbitrary delay in processing the input data. The processing circuitry can include a tap gradient update circuit for generating a tap gradient corresponding to the read out data, based on equalizer error signals generated by the processing circuitry. | 12-05-2013 |
20130343446 | HIGHLY-SPECTRALLY-EFFICIENT RECEPTION USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING - Circuitry for use in a receiver may comprise: a front-end circuit operable to receive an orthogonal frequency division multiplexing (OFDM) symbol on a first number of physical subcarriers. The circuitry may comprise a decoding circuit operable to decode the OFDM symbol using an inter-carrier interference (ICI) model, the decoding resulting in a determination of a sequence of symbols, comprising a second number of symbols, that most-likely correspond to the received OFDM symbol, where the second number is greater than the first number. The sequence of symbols may comprise N-QAM symbols, N being an integer. The ISCI model may be based, at least in part, on non-linearity experienced by the OFDM symbol during transmission by a transmitter, propagation over a channel, and/or reception by the receiver. The ISCI model may be based, at least in part, on phase-noise introduced to the OFDM symbol during transmission by a transmitter, propagation over a channel, and/or reception by the receiver. | 12-26-2013 |
20140003483 | Highly-Spectrally-Efficient Receiver | 01-02-2014 |
20140016686 | OVERCOMING MULTIPLE REFLECTIONS IN PACKAGES AND CONNECTORS AT HIGH SPEED BROADBAND SIGNAL ROUTING - Discussed herein is a semiconductor package and a method of overcoming multiple reflections while transmitting high speed broadband signals through the semiconductor package. The semiconductor package includes at least one trace having a first terminal that is configured to receive a broadband signal and a second terminal configured to output the broadband signal. The semiconductor package includes a stub which is positioned along a longitudinal length of the trace and is configured to reduce broadband reflections in the trace by causing multi-frequency reflections to destructively interfere with at least some broadband reflections in the trace that occur due to impedance discontinuities. The stub parameters such as stub length, stub impedance and the location of the stub along the trace can be determined to minimize signal degradation. | 01-16-2014 |
20140016687 | Apparatus for Performing Channel Equalization on a MIMO Signal - The present invention relates to a receiver in a 2×2 Line of Sight Multiple Input Multiple Output, LoS MIMO, system. The receiver is arranged to estimate a first (Ŝ | 01-16-2014 |
20140133541 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - A wireless communication apparatus includes a wireless section configured to receive a plurality of signals via a plurality of antennae from a transmitting device having another plurality of antennae; and a demodulation section configured to apply QR decomposition to a channel matrix generated based on the received signals from the wireless section, to extract a plurality of weight coefficients corresponding to a symbol to be demodulated from a unitary matrix Q, to filter the received signals weighted with the weight coefficients, and to separate the filtered received signals based on a submatrix of an upper triangular matrix R. | 05-15-2014 |
20140133542 | SIGNAL EQUALIZATION WITH COMPENSATION FOR SCRAMBLING CODE CORRELATION - A method for equalizing a received radio signal in a WCDMA system, comprises receiving ( | 05-15-2014 |
20140140385 | EQUALIZER AND OPERATING METHOD THEREOF - An equalizer includes a sampler configured to sample an edge and data of an input signal or an induced signal obtained from the input signal, a clock generator configured to generate an edge clock used to decide sampling timing of the edge and a data clock used to decide sampling timing of the data based on the sampled edge and the sampled data, and a controller configured to control the sampling timing of the edge and the sampling timing of the data based on the sampled edge and the sampled data. | 05-22-2014 |
20140185660 | WIRELESS RECEPTION SYSTEM AND METHOD FOR ESTIMATING CHANNEL EFFECT THEREOF - A wireless reception system includes a reception module, a preliminary estimation module, an equalization module and a selection module. The reception module receives a reference signal and at least one input signal transmitted via a multipath environment. The reference signal is associated with a known signal unaffected by the multipath environment. The preliminary estimation module generates a plurality of candidate channel effects according to the at least one input signal. The equalization module performs equalization on the reference signal according to the candidate channel effects to generate a plurality of equalization results. From the equalization results, the selection module selects an optimal equalization result that is most similar to the known signal, and selects the candidate channel effect corresponding to the optimal equalization result to represent the multipath environment. | 07-03-2014 |
20140192852 | EQUALIZER DEVICE, RECEIVER DEVICE AND EQUALIZATION METHOD - The present invention is provided with: a CIR generating unit which generates an channel impulse response from a received signal; a CIR variation detection unit which uses a plurality of channel impulse responses generated from a plurality of different sections of the received signal by the CIR generating unit to detect an amount of variation in the channel impulse response; an equivalent width control unit which determines an equivalent width corresponding to a signal length used in equalization of the received signal such that the equivalent width is shortened as the amount of variation in the channel impulse response increases; and a waveform equalization unit which uses the channel impulse response generated by the CIR generating unit to equalize the received signal over the equivalent width determined by the equivalent width control unit and generate a demodulated signal. | 07-10-2014 |
20140198835 | METHOD AND SYSTEM FOR A MULTI-STANDARD RECEIVER - A multi-standard receiver may comprise in an electronic device, receiving an input radio frequency (RF) signal comprising at least two RF signals of different communication standards. The input RF signal may be separated into two signals based on their different communication standard sand configurable gain levels may be applied to equalize their magnitudes. The amplified signals may be combined, and the combined signals may be converted to a digital signal. The configurable gain may be applied to the two signals using variable gain amplifiers. A null may be generated at the input of at least one of the variable gain amplifiers utilizing a mixer and a filter, both configured to a desired frequency. The desired frequency may correspond to an interferer signal. The input RF signal may be separated into two signals utilizing a diplexer. The input RF signal may be received from a wired connection and/or an antenna. | 07-17-2014 |
20140233626 | VIRTUAL RECEPTION DIVERSITY APPARATUS AND METHOD IN WIRELESS COMMUNICATION SYSTEM - A receiving apparatus in a wireless communication system is provided. The receiving apparatus includes a first interference cancellation unit configured to cancel interference from a received signal that is received through an antenna according to a first scheme, a second interference cancellation unit configured to cancel interference from the received signal that is received through the antenna according to a second scheme, and a combination unit configured to combine the signal from which interference is cancelled according to the first scheme and the signal from which interference is cancelled according to the second scheme. | 08-21-2014 |
20140269878 | WIRELESS COMMUNICATION SYSTEM WITH SIGNAL PROCESSING MECHANISM AND METHOD OF OPERATION THEREOF - A method of operation of a wireless communication system includes: receiving a received signal; generating concurrently a first modulation data and a second modulation data from the received signal; calculating an error energy for the first modulation data and the second modulation data; and removing a residual Direct Current (DC) offset from the received signal based on determining a minimum of the error energy for the first modulation data or the second modulation data. | 09-18-2014 |
20140269879 | DIGITAL TRANSMITTER - An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer. | 09-18-2014 |
20140286383 | Selectable-tap Equalizer - A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval. | 09-25-2014 |
20140314136 | PASSIVE EQUALIZER AND HIGH-SPEED DIGITAL SIGNAL TRANSMISSION SYSTEM USING THE SAME - Disclosed herein are a passive equalizer and a high-speed digital signal transmission system, including first and second impedances connected in series to a first transfer line, third and fourth impedances connected in series to a second transfer line, a first inductor connected in parallel between the first impedance and the second impedance, a second inductor connected in parallel between the third impedance and the fourth impedance, and a resistor connected in series between the first inductor and the second inductor. | 10-23-2014 |
20140355659 | RECEIVING APPARATUS AND METHOD FOR ACCELERATING EQUALIZATION CONVERGENCE - A receiving apparatus applied to a receiving end of a communication device having an equalizer is provided. The receiving apparatus includes a filter and a channel estimator. The filter filters a received signal to reduce a multipath effect of the received signal and outputs a filtered signal. The channel estimator performs channel estimation on the received signal to generate an estimation result. The estimation result is for determining which of the received signal and the filtered signal is to be selected and sent to the equalizer. | 12-04-2014 |
20150078428 | TECHNIQUES FOR DETERMINING COVARIANCE MEASURES BASED ON CORRELATION CRITERIA - A method includes providing a plurality of sets of equalizer taps, wherein each set is coupled to a respective one of a plurality of antenna ports; assigning a first plurality of equalizer taps of the sets of equalizer taps to a first subset; determining a first covariance measure associated with the first plurality of equalizer taps of the first subset based on a first correlation criterion; assigning a second plurality of equalizer taps of the sets of equalizer taps to a second subset; and determining a second covariance measure associated with the second plurality of equalizer taps of the second subset based on a second correlation criterion. | 03-19-2015 |
20150139293 | HIERARCHICAL MODULATION FOR MULTIPLE STREAMS - A receiving device is provided to coordinate transmissions from a first transmitting device and from a second transmitting device of a plurality of transmitting devices to the receiving device in a communication network. The transmissions are coordinated by sending, from the receiving device, a first instruction to the first transmitting device to transmit a first signal according to first transmission characteristics, wherein the first signal comprises a base layer data stream, sending, from the receiving device, a second instruction to the second transmitting device to transmit a second signal according to second transmission characteristics, wherein the second signal comprises an enhanced layer data stream, receiving, at the receiving device, a hierarchical modulation signal comprising the first signal and the second signal being simultaneously transmitted, and separating, at the receiving device, the base layer data stream and the enhanced layer data stream from the received hierarchical modulation signal. | 05-21-2015 |
20150311986 | Phase Noise Tracking and Reduction - A group of data symbols for a current block of data symbols in multiple blocks received over a communication channel is equalized, based on a pilot block, to generate a group of equalized symbols. The group of equalized symbols is de-rotated as a function of a current phase estimate to determine initial de-rotated equalized symbols. The phase estimate is an estimate of phase caused by noise for blocks previous to the current block. Additionally, a phase metric is calculated from real and imaginary parts of the initial de-rotated equalized symbols, wherein the phase metric estimates phase caused by noise for the current block. The current phase estimate is updated with the phase metric. The initial de-rotated equalized symbols are de-rotated by the phase metric to determine final equalized and de-rotated symbol estimates. The final equalized and de-rotated symbol estimates are output. Apparatus, methods, and computer program products are disclosed. | 10-29-2015 |
20150326277 | METHOD FOR TRANSMITTING SIGNAL AND DEVICE THEREFOR - The invention provides a method for transmitting a signal to an external electronic device. The method includes obtaining a compensation value by which an equalizer compensates a signal transmitted from the external electronic device, comparing the compensation value with a set of reference values so as to obtain one or more parameters, and adjusting an output signal transmitted from a transmit unit to the external electronic device based on the one or more parameters. | 11-12-2015 |
20150365262 | ELECTRICAL DISPERSION COMPENSATOR AND TAP COEFFICIENT CALCULATION METHOD SUITABLY APPLICABLE THERETO - There is provided an apparatus allowing waveform shaping even at a low sampling rate, and including a sampling unit | 12-17-2015 |
20150381232 | Multilevel Driver for High Speed Chip-to-Chip Communications - Transmission line driver systems are described which are comprised of multiple paralleled driver elements. The paralleled structure allows efficient generation of multiple output signal levels with adjustable output amplitude, optionally including Finite Impulse Response signal shaping and skew pre-compensation. | 12-31-2015 |
20160036605 | Selectable-tap Equalizer - A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval. | 02-04-2016 |
20160087819 | EQUALIZING TRANSMITTER AND METHOD OF OPERATION - A transmitter for providing channel equalization that includes a first driver and second driver having a high pass filter. The first driver generates a first output signal representing a digital input signal. The second driver generates a second output signal representing a high pass filtered version of the digital input signal. The first and second output signals are summed to provide a third output signal that is channel equalized for transmission over a channel. | 03-24-2016 |
20160204964 | TRANSMISSION UNIT, RECEPTION UNIT, AND COMMUNICATION SYSTEM | 07-14-2016 |