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Adaptive

Adaptive patent applications listed include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

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Pulse Or Digital Communications


Equalizers > Automatic > Adaptive



Power aware equalization in a serial communications link
05/28/15 - 20150146768 - Power aware equalization in a serial communications link that includes a transmitter and a receiver, including: determining, by a power aware equalization module, a required signal eye width and a required signal eye height for signals received by the receiver; identifying one or more signal equalizers for signals transmitted over...

Extended bandwidth adaptive digital pre-distortion with reconfigurable analog front-ends
05/28/15 - 20150146769 - A pre-distortion method. A signal to be transmitted Tx is pre-distorted to compensate for nonlinearities of a transmitter. The pre-distorted signal is filtered by an EBEE filter and a baseband filter. The EBEE filter has a filter characteristic of that cancels the baseband filter response over the range of frequencies...

Channel estimating method for fbmc telecommunication system
05/28/15 - 20150146770 - The channel thus estimated is used to make an equalisation before the analysis filter bank....

Multiwire linear equalizer for vector signaling code receiver
05/28/15 - 20150146771 - Continuous-time linear equalization of received signals on multiple wire channels while maintaining accurate common mode signal values. Multiwire group signaling using vector signaling codes simultaneously transmits encoded values on multiple wires, requiring multiple receive signals to be sampled simultaneously to retrieve the full transmitted code word. By misaligning transitions on...

Fine phase estimation for highly spectrally efficient communications
05/14/15 - 20150131709 - A receiver may process a received signal to generate a processed received signal. The receiver may generate, during a sequence estimation process, an estimate of a phase error of the processed received signal. The receiver may generate an estimate of a value of a transmitted symbol corresponding to the received...

Blind frequency domain interference aware chip-level equalization
04/30/15 - 20150117507 - A frequency domain chip-level equalizer is disclosed. The equalizer includes an estimation module configured to generate a frequency domain estimate of an auto-correlation function of a received signal; and an equalization module configured to apply frequency domain equalization to the received signal using the frequency domain estimate of the auto-correlation...

Broadband amplifier linearization using captured histogram data
04/30/15 - 20150117508 - A transmitter's operation is characterized using components having relatively low cost and low complexity. A device includes comparator(s) that compare a transmitter's analog output to predetermined level(s) to generate count(s) associated with analog output range bin(s). Each of the predetermined levels is associated with a corresponding one of the analog...

Receiving apparatus and receiving method
04/30/15 - 20150117509 - A receiving apparatus includes a channel estimating unit that performs channel estimation by using a reception signal and obtains a channel estimation value, a demodulation processing unit that performs demodulation processing by using the channel estimation value and the reception signal, a weight calculating unit that calculates weight for decoding...

Method and apparatus for passive equalization and slew-rate control
04/02/15 - 20150092829 - A device for passive equalization and slew-rate control of a signal includes a first branch that includes a first driver coupled in series with an equalization capacitor, and a second branch that includes a second driver coupled in series with a resistor. The second branch may be coupled in parallel...

Method and system for baseband predistortion linearization in multi-channel wideband communication systems
04/02/15 - 20150092830 - An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup...

Equalization method and equalizer for received signals in microwave mimo system
04/02/15 - 20150092831 - The present invention provides an equalization method and an equalizer for received signals in a microwave MIMO system. By performing vertical spatial filtering on and combining internal sub-signals for n received signals, an initial sliced signal corresponding to a received signal currently to be decoded is obtained; (n−1) ICI signals...

Reception device, reception method, and program
03/26/15 - 20150085910 - There is provided a reception device including a reception unit configured to receive an OFDM (Orthogonal Frequency Division Multiplexing) signal, an acquisition unit configured to acquire a transmission parameter concerning the OFDM signal contained in the OFDM signal, and a selection unit configured to select a demodulation mode of the...

Method for equalizing transmission spectrum of a wireless communication transmitter
03/26/15 - 20150085911 - This disclosure provides a method for equalizing the transmission spectrum of a wireless communication transmitter. The method includes: providing a plurality of single-frequency signals; respectively inputting the plurality of single-frequency signals into the transmitter, wherein each single-frequency signal has a predetermined frequency and all the predetermined frequencies are different from...

Adaptive equalizer and method of controlling the same
03/26/15 - 20150085912 - Provided are an adaptive equalizer for adaptively controlling an equalization coefficient until two comparators outputs a same value, after generating a sensitivity difference between signals at a front end of each comparator for performing sampling, and a method of controlling the adaptive equalizer....

Data receiving circuit and semiconductor device
03/26/15 - 20150085913 - A data receiving circuit that can accurately obtain a data signal corresponding to information data from a high speed high density transmitted signal, and a semiconductor device including the data receiving circuit. The amplitude of a first differential signal corresponding to a level difference between a pair of received differential...

Unified interference power estimation
03/19/15 - 20150078429 - A communication device, such as a smart phone, includes logic to determine a noise power estimate. In an example, a frequency domain calculation may be used to determine noise components within the noise power estimate. Further, a product of a channel estimate and equalizer effect may be used in the...

Adaptive equalizer
02/19/15 - 20150049797 - An equalizer that includes equalizer circuitry, a mean squared error (MSE) system, and adaptive control logic includes features that inhibit undesirable convergence to local minima....

Serdes communications with retiming receiver supporting link training
02/12/15 - 20150043628 - A SerDes corn link with a retiming receiver is operable in link training (LT) mode. A SerDes transmitter includes a TX FIR channel driver to transmit TX Data with TX pre-emphasis EQ based on TX FIR coefficients. The retiming receiver includes an RTE (retimer/reclocker) with an RT FIR driver outputting...

Block time domain channel estimation in ofdm system
02/12/15 - 20150043629 - An OFDM receiver receives OFDM symbols in the frequency domain and comb filters and then punctures the OFDM symbols to leave symbols with actual pilot information and with null values at the data symbols. The receiver provides the punctured OFDM symbols to an OFDM symbol queue. A virtual pilot interpolator...

Precoding loss reduction
01/29/15 - 20150030062 - An apparatus for encoding data signals includes a transmitter configured to encode and transmit a data signal over a communication channel, the transmitter including a precoder; a signal shaper configured to adjust the data signal by applying an equalization setting to the data signal, the equalization setting including an amplitude...

Characterizing a broadband wireless channel
01/29/15 - 20150030063 - Embodiments disclosed herein provide systems and methods for determining properties of a channel response in frequency and time at a subcarrier basis. The determined properties of the channel may include a power delay profile (PDP), channel impulse response, attenuation and phase response over frequency and time, and antenna correlation over...

Receiving device and method
01/08/15 - 20150010046 - A digital broadcast receiver receives a digital broadcast signal through a plurality of antennas, orthogonally demodulates the received signals, performs channel estimation by detecting a delay profile from a known signal included in each of the orthogonally demodulated signals, and uses the channel estimation results to equalize data signals included...

Interference cancellation radio receiver
01/01/15 - 20150003509 - A radio receiver apparatus includes a serving cell detector configured to generate a detected serving cell signal based on a serving cell detector input signal. The radio receiver apparatus further includes a first interfering cell detector configured to generate a detected first interfering cell signal based on a first interfering...

Communication device, communication method, communication program, processor, and communication system
12/18/14 - 20140369397 - An iterative processing unit iterates equalization processing on a reception signal. A PMI determination unit determines a precoding matrix by taking into consideration an interference amount that is removable by the iterative processing unit. A control information transmission unit transmits information indicating the precoding matrix....

Digital filter, partial response equalizer, and digital coherent receiver device and method
12/18/14 - 20140369398 - Aspects of the present invention include devices and methods for receiving signals in communication systems. A partial response equalizer includes a full response linear equalizing device for equalizing a received signal; and a partial response post filter for post filtering the equalized signal. Aspects of the present invention devices and...

Transmission method, transmission device, transmission program, and transmission system
12/18/14 - 20140369399 - A transmission device for alternately performing transmission and reception to/from a communication destination transmission device transmits transmit data to the communication destination transmission device. It receives return data transmitted by the communication destination transmission device after the transmit data reaches the communication destination transmission device. A predetermined period of time...

Receiving circuit
12/11/14 - 20140362899 - A circuit includes: a first adder configured to add a first offset cancellation value to an input signal value; a second adder configured to add a first equalization value to an output signal value from the first adder; a first comparator configured to make a binary decision on an output...

Closed-loop high-speed channel equalizer adaptation
12/11/14 - 20140362900 - A serial communication circuit (FIG. 3) is disclosed. The circuit includes an equalizer circuit (306) arranged to receive a data signal (CH 1) and produce an equalized data signal. A log detector circuit (300) receives the data signal and produces a power signal indicating a power level of the data...

Wireless communication device and weight coefficient computation method
12/04/14 - 20140355660 - A wireless communication device includes a reception processing circuit including a weight coefficient computation circuit that includes a computation circuit to compute a weight coefficient which is used for removing a distortion of a reception signal caused by a multi-path, and which of each of fingers corresponds to each of...

Method for subrate detection in bandwidth constrained communication systems
11/20/14 - 20140341265 - The present invention relates to utilization of sampling rate at the receiver that is below the symbol rate of a bandwidth constrained communication system. Furthermore, if the appropriate up-sampling technique is used, the method avails full retrieval of the information from the under sampled received signal....

Methods and circuits for adaptive equalization
11/20/14 - 20140341266 - An integrated circuit equalizes a data signal expressed as a series of symbols. The symbols form data patterns with different frequency components. By considering these patterns, the integrated circuit can experiment with equalization settings specific to a subset of the frequency components, thereby finding an equalization control setting that optimizes...

Low-complexity, adaptive, fractionally spaced equalizer with non-integer sampling
11/20/14 - 20140341267 - An apparatus comprising a memory and a processor coupled to the memory, wherein the memory includes instructions that when executed by the processor cause the apparatus to perform the following receive an incoming signal at a sampling rate that is greater than a symbol rate associated with the incoming signal,...

Ofdm receiver with time domain channel estimation
11/13/14 - 20140334530 - 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...

Frequency-domain turbo equalization, including multi-mode adaptive linear equalization, adaptive decision-directed channel estimation, adaptive noise variance estimation, and dynamic iteration control
11/06/14 - 20140328380 - Frequency domain based methods and systems to perform adaptive multi-mode pre-decoding linear equalization, adaptive channel estimation, turbo equalization, turbo equalization iteration control, and noise variance estimation. An adaptive linear pre-decoder equalizer may include a multi-mode equalizer, which may include a blind equalizer to determine initial equalization coefficients and a decision-directed...

Method and apparatus for transmitting and receiving data in multicarrier communication system
10/30/14 - 20140321524 - A method and an apparatus for transmitting and receiving data in a filter bank based multicarrier communication system are provided. The method includes receiving a plurality of data blocks and performing an Inverse Fast Fourier Transform (IFFT) operation on the plurality of data blocks, multiplying the plurality of data blocks...

Highly-spectrally-efficient reception using orthogonal frequency division multiplexing
10/30/14 - 20140321525 - 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...

Frequency offset estimation in communication devices
10/30/14 - 20140321526 - The present subject matter discloses a system and a method for estimating a frequency offset in communication devices. In one embodiment, the method of estimating a frequency offset in a communication device comprises generating a reconstructed signal based at least in part on a channel impulse response (CIR) corresponding to...

Method and apparatus for a single-carrier wireless communication system
10/23/14 - 20140314137 - A method of communication comprises partitioning a single-carrier data stream into equal-size blocks, and partitioning each block into a plurality of equal-size sub-blocks. A first set of cyclic prefixes and/or postfixes is inserted into the blocks to allow a linear convolution of a frequency-selective multipath channel having a long delay...

Back channel adaptation for transmission under peak power constraints
10/23/14 - 20140314138 - A method comprises adapting a first tap weight of an equalizer, wherein a second tap weight of the equalizer is based at least in part on the first tap weight. Adapting the first tap weight further comprises computing a gradient from a data signal, an error signal and a channel...

Iteratively scanning equalization coefficients to optimize signal quality in a data communication link
10/16/14 - 20140307766 - A method includes iteratively scanning, through a processor, at least a portion of a map of equalization coefficients related to channel equalization in a data communication link based on an ordinal integer step size S>1 for N (N>1) different sequences thereof to determine optimal points therein for which a signal...

Methods and systems for modulation classification
10/16/14 - 20140307767 - A method and wireless receiver for determining a modulation format of a transmitted signal from a received signal over a multipath channel are disclosed. The received signal has a frequency offset with respect to the transmitted signal. The wireless receiver down-samples the received signal. The down-sampled signal is equalized in...

Frequency dependent i/q impairment compensation
10/16/14 - 20140307768 - Methods, systems, and devices are described for compensating for transmit I/Q impairments in a digital signal. A frequency domain version of a first one of the components may be scaled at a wireless modem according to a frequency dependent I/Q impairment compensation function to obtain a compensated frequency domain version...

Multi-mode frequency domain equalization with adaptation to varying channel conditions
10/02/14 - 20140294055 - Methods and systems to configure a receiver based on a channel condition. A system may be implemented to estimate a channel based on PN sequences in a received signal, concurrently equalize a frequency domain representation of the signal with multiple blind adaptive equalizers, and evaluate results of the equalizations to...

Low-complexity diversity reception
10/02/14 - 20140294056 - A system may comprise a plurality of signal processing paths, a bin-wise combiner, an inverse transformation block, and a DAC. Each signal processing path may comprise a transformation block that is operable to transform a first time-domain digital signal to an associated frequency-domain signal having a plurality of subband signals....

Apparatus and method of compensating for i/q imbalance in direct up-conversion system
10/02/14 - 20140294057 - An apparatus and a method of compensating for an I/Q imbalance in a direct up-conversion system prevents the performance of the system from being deteriorated by efficiently compensating for an I/Q timing skew, an I/Q phase imbalance, and an I/Q gain imbalance by using a characteristic of an OFDM scheme...

Method for equalizing filterbank multicarrier (fbmc)modulations
09/25/14 - 20140286384 - A method for equalizing the received signal in communications based on filterbank multicarrier modulations and, more particularly, to such a method and system especially advantageous in situations where the channel frequency selectivity is exceptionally high. The method significantly improves the performance of traditional filterbank equalization algorithms based on finite impulse...

Systems and methods for multi-dimensional signal equalization
09/25/14 - 20140286385 - Embodiments are related to systems and methods for data processing, and more particularly to systems and methods for equalizing a data signal....

Interference reduction of multiple signals
09/25/14 - 20140286386 - The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more...

Rank-order equalization
09/25/14 - 20140286387 - For digital data transmitted using a vector signaling encoding, a rank-order equalizer cancels various channel noise such as inter-symbol interference. Further, rank-order units may be cascaded to achieve improved equalization over successive sample vector signals in a rank-order equalizer. Multiple rank-order equalizers further operate in parallel in a feed forward...

Configurable multi-dimensional driver and receiver
09/25/14 - 20140286388 - Embodiments of the invention are generally directed to a configurable multi-mode driver and receiver. An embodiment of a communication system includes a communication channel, and a first device and a second device coupled with the communication channel. The first device includes a driver apparatus to drive data signals on the...

Block time domain channel estimation in ofdm system
09/18/14 - 20140269882 - An OFDM receiver receives OFDM symbols in the frequency domain and comb filters and then punctures the OFDM symbols to leave symbols with actual pilot information and with null values at the data symbols. The receiver provides the punctured OFDM symbols to an OFDM symbol queue. A virtual pilot interpolator...

Non-linear time domain channel estimation in ofdm systems
09/18/14 - 20140269883 - An OFDM receiver generates an initial channel impulse response in response to a received OFDM signal. The receiver determines the time span within the initial channel impulse response in which significant paths are present. An intermediate channel impulse response estimator identifies paths within the initial channel impulse response and generates...

Method, apparatus, and system for sliding matrix scoreboard utilized in auto feedback closed loops
09/18/14 - 20140269884 - Requests are identified for equalization coefficients and a plurality of coefficient selections are tracked relating to the requests. A matrix is maintained within a grid space that is to represent the coefficients, the matrix representing one or more of the coefficient selections. The matric is adjusted within the grid space...

Method for reducing equalizer complexity in communication links
09/18/14 - 20140269885 - The present invention relates to a method of reducing equalizer complexity in communication systems, which also provides for reduced power dissipation. The method consists of reducing the number of channel responses expected by the equalizer by averaging sub-groups of all of the possible the channel responses chosen in a particular...

Wireless power transfer in-band communication system
09/18/14 - 20140269886 - A wireless charging in-band communication system includes a channel encoding for message error correction and detection. A modulation module performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source. A synchronization module prepends the message with a synchronization sequence having Golay complementary...

Equalizer and detector arrangement employing joint entropy-based calibration
09/18/14 - 20140269887 - An equalizer configured to receive a data signal from a channel. The detector is coupled to the equalizer, and a calibration unit is coupled with the equalizer and the detector. The calibration unit is configured to jointly calibrate the equalizer and the detector using a metric subject to an entropy-preserving...

Sending and receiving system, method of sending and receiving, and receiving apparatus
09/04/14 - 20140247862 - A sending and receiving system include a sending apparatus that performs a serial communication and includes a sending unit that sends a signal having a predetermined pattern; and a receiving apparatus that performs the serial communication and includes a receiving unit that provides the signal sent from the sending unit...

Wireless communication system with interference cancellation mechanism and method of operation thereof
08/28/14 - 20140241412 - A method of operation of a wireless communication system includes: processing a received signal; calculating filter weights, by a filter weights estimation module, from the received signal; generating a corrected sequence, through a widely linear-single antenna interference cancellation (WL-SAIC) module, by applying the filter weights; calculating a channel estimation concurrently...

Information processor, receiver, and information processing method
08/28/14 - 20140241413 - An information processor has a CIR estimator configured to estimate channel impulse response of an input signal including a channel estimation sequence and a data sequence, based on the channel estimation sequence, an extended CIR calculator configured to calculate extended channel impulse response based on the channel impulse response estimated...

Method of combining signals from multiple channels in a multi-antenna receiver and its apparatus
08/21/14 - 20140233628 - The present invention relates to the field of MIMO wireless communication. Disclosed are a method for combining signals from multiple channels in a multi-antenna receiver and its apparatus. In the present invention, weight values corresponding to each antenna are calculated based on noise estimates or SNRs obtained from channel estimation,...

Adaptive real-time control of de-emphasis level in a usb 3.0 signal conditioner based on incoming signal frequency range
08/14/14 - 20140226705 - An apparatus comprises a differential equalizer having: a) a first differential input, b) a second differential input, c) a first differential output, and d) a second differential output; a frequency detector coupled to the first and second differential inputs; an amplifier coupled to a first differential output and a second...

System and method for anticipatory receiver switching based on signal quality estimation
08/14/14 - 20140226706 - 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...

Systems and methods for blind mode adaptive equalization with multiple algorithms
08/07/14 - 20140219327 - Various embodiments described herein are directed to methods and systems for blind mode adaptive equalizer system to recover complex valued data symbols from the signal transmitted over time-varying dispersive diversity wireless channels. For example, various embodiments may utilize an architecture comprised of a bank of estimation units, a normalizing gain...

Equalization processing apparatus, wireless communication terminal, and equalization processing method
08/07/14 - 20140219328 - An equalization processing apparatus includes a correlation matrix generating unit. The correlation matrix generating unit calculates a correlation value between a plurality of paths of a received signal coming from the paths based on a correlation pattern selected from a plurality of correlation patterns indicating combinations of the numbers of...

Receiver with doppler tolerant equalization
07/31/14 - 20140211837 - A mobile communication device to equalize a Doppler shifted received signal according to one embodiment is configured to: extract one or more pilot signals from a segment of the received signal; perform Minimum Mean Square Error (MMSE) filtering on the extracted pilot signals, wherein the filter provides estimated pilot signal...

Inter symbol interference reduction by applying turbo equalization mode
07/24/14 - 20140204991 - The present disclosure relates to a receiving node, and to a related method for determining when to apply a turbo equalization mode to compensate for Inter-Symbol Interference in a radio signal received over a radio channel from a transmitting node. The method comprises decoding the received radio signal into a...

Apparatus and method for iterative interference cancellation in a wireless communication network
07/10/14 - 20140192853 - One or more aspects of the disclosure provide an efficient equalization scheme capable of mitigating multi-path interference on channels with large delay spread using short-length equalizers. That is, by dividing stored samples of a signal received on the multi-path channel by time into a plurality of clusters, a short-length equalizer...

Receiver apparatus, method for processing received signal and computer program product
07/10/14 - 20140192854 - A reception apparatus includes: a Fourier transform unit to output a converted signal; a propagation path estimation unit to calculate propagation-path-estimated-values based on pilot subcarriers; and a propagation path compensation unit, including a filter, to compensate propagation path distortion, the filter includes: first multipliers to multiply the propagation-path-estimated-values of taps...

Adaptive equalizer
07/10/14 - 20140192855 - An adaptive equalizer capable of suppressing an increase in circuit scale and an increase in operation clock frequency. An adaptive equalizer (100) performs an adaptive equalization process on a time-region signal in a frequency region. A signal converter (200) has: a first wide-bit memory (201) capable of reading/writing a plurality...

High speed receivers circuits and methods
07/03/14 - 20140185661 - The present invention provides GPA embodiments. In some embodiments, a GPA stage with a negative capacitance unit is provided....

Methods and arrangements for phase tracking for multi-mode operation in wireless networks
07/03/14 - 20140185662 - Logic may comprise a single phase tracking implementation for all bandwidths of operation and the logic may adaptively change pre-defined and stored track parameters if the receiving packet is 1 MHz bandwidth. Logic may detect a packet and long training fields before performing a 1 MHz classification. Logic may auto-detect...

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