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Pulse Or Digital Communications > Equalizers > Automatic > Adaptive

Adaptive

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

11/20/14 - 20140341265 - Method for subrate detection in bandwidth constrained communication systems
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....

11/20/14 - 20140341266 - Methods and circuits for adaptive equalization
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...

11/20/14 - 20140341267 - Low-complexity, adaptive, fractionally spaced equalizer with non-integer sampling
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,...

11/13/14 - 20140334530 - Ofdm 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...

11/06/14 - 20140328380 - Frequency-domain turbo equalization, including multi-mode adaptive linear equalization, adaptive decision-directed channel estimation, adaptive noise variance estimation, and dynamic iteration control
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...

10/30/14 - 20140321524 - Method and apparatus for transmitting and receiving data in multicarrier communication system
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...

10/30/14 - 20140321525 - 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...

10/30/14 - 20140321526 - Frequency offset estimation in communication devices
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...

10/23/14 - 20140314137 - Method and apparatus for a single-carrier wireless communication system
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...

10/23/14 - 20140314138 - Back channel adaptation for transmission under peak power constraints
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...

10/16/14 - 20140307766 - Iteratively scanning equalization coefficients to optimize signal quality in a data communication link
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...

10/16/14 - 20140307767 - Methods and systems for modulation classification
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...

10/16/14 - 20140307768 - Frequency dependent i/q impairment compensation
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...

10/02/14 - 20140294055 - Multi-mode frequency domain equalization with adaptation to varying channel conditions
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...

10/02/14 - 20140294056 - Low-complexity diversity reception
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....

10/02/14 - 20140294057 - Apparatus and method of compensating for i/q imbalance in direct up-conversion system
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...

09/25/14 - 20140286384 - Method for equalizing filterbank multicarrier (fbmc)modulations
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...

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

09/25/14 - 20140286386 - Interference reduction of multiple signals
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...

09/25/14 - 20140286387 - Rank-order equalization
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...

09/25/14 - 20140286388 - Configurable multi-dimensional driver and receiver
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...

09/18/14 - 20140269882 - Block time domain channel estimation in ofdm system
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...

09/18/14 - 20140269883 - Non-linear time domain channel estimation in ofdm systems
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...

09/18/14 - 20140269884 - Method, apparatus, and system for sliding matrix scoreboard utilized in auto feedback closed loops
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...

09/18/14 - 20140269885 - Method for reducing equalizer complexity in communication links
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...

09/18/14 - 20140269886 - Wireless power transfer in-band communication system
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...

09/18/14 - 20140269887 - Equalizer and detector arrangement employing joint entropy-based calibration
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...

09/04/14 - 20140247862 - Sending and receiving system, method of sending and receiving, and receiving apparatus
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...

08/28/14 - 20140241412 - Wireless communication system with interference cancellation mechanism and method of operation thereof
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...

08/28/14 - 20140241413 - Information processor, receiver, and information processing method
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...

08/21/14 - 20140233628 - Method of combining signals from multiple channels in a multi-antenna receiver and its apparatus
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,...

08/14/14 - 20140226705 - Adaptive real-time control of de-emphasis level in a usb 3.0 signal conditioner based on incoming signal frequency range
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...

08/14/14 - 20140226706 - 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...

08/07/14 - 20140219327 - Systems and methods for blind mode adaptive equalization with multiple algorithms
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...

08/07/14 - 20140219328 - Equalization processing apparatus, wireless communication terminal, and equalization processing method
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...

07/31/14 - 20140211837 - Receiver with doppler tolerant equalization
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...

07/24/14 - 20140204991 - Inter symbol interference reduction by applying turbo equalization mode
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...

07/10/14 - 20140192853 - Apparatus and method for iterative interference cancellation in a wireless communication network
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...

07/10/14 - 20140192854 - Receiver apparatus, method for processing received signal and computer program product
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...

07/10/14 - 20140192855 - Adaptive equalizer
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...

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

07/03/14 - 20140185662 - Methods and arrangements for phase tracking for multi-mode operation in wireless networks
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...

06/26/14 - 20140177696 - Receiver circuit with de-emphasis function
A receiver circuit includes a first differential amplification unit including a variable load section, and configured to receive first and second input signals, and to generate first and second output signals, which are amplified based on an impedance value of the variable load section and a voltage difference between the...

06/19/14 - 20140169434 - Method and apparatus for phase noise mitigation
An approach is provided to mitigate phase noise by correcting common phase error and inter-carrier-interference in a received signal. The approach involves determining a received signal includes phase noise comprising at least a common phase error component and an inter-carrier-interference component. The approach also involves causing the common phase error...

06/19/14 - 20140169435 - Device and method for correcting duty cycle, and receiver including the same
A duty cycle correcting device is provided which includes a pulse width adjusting unit which adjusts a pulse width of an input signal according to a pulse width control code; a comparison unit which compares an output signal of the pulse width control unit with a plurality of reference voltages;...

06/19/14 - 20140169436 - Modulation and equalization in an orthonormal time-frequency shifting communications system
A system and method of providing a modulated signal useable in a signal transmission system. The method includes transforming, perhaps with respect to both time and frequency, a data frame including a plurality of data elements into a transformed data matrix. The transformed data matrix includes a plurality of transformed...

06/19/14 - 20140169437 - Modulation and equalization in an orthonormal time-frequency shifting communications system
A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data...

06/19/14 - 20140169438 - Receiver with clock recovery circuit and adaptive sample and equalizer timing
A receiver is equipped with an adaptive phase-offset controller and associated timing-calibration circuitry that together shift the timing for a data sampler and a digital equalizer. The sample and equalizer timing is shifted to a position with less residual inter-symbol interference (ISI) energy relative to the current symbol. The shifted...

06/12/14 - 20140161170 - Feed forward equalization for highly-spectrally-efficient communications
A receiver may be operable to receive a signal. A sequence estimation module of the receiver may generate estimated symbols corresponding to the received signal. The generating of the estimated symbols may use tap information associated with one or both of a pulse shaper via which the signal was transmitted...

06/05/14 - 20140153631 - Methods and circuits for asymmetric distribution of channel equalization between devices
A transceiver architecture supports high-speed communication over a signal lane that extends between a high-performance integrated circuit (IC) and one or more relatively low-performance ICs employing less sophisticated transmitters and receivers. The architecture compensates for performance asymmetry between ICs communicating over a bidirectional lane by instantiating relatively complex transmit and...

05/22/14 - 20140140387 - Systems and methods for adaptive blind mode equalization
A blind mode adaptive equalizer system to recover the in general complex valued data symbols from the signal transmitted over time-varying dispersive wireless channels is disclosed comprising an adaptive communication receiver for the demodulation and detection of digitally modulated signals received over wireless communication channels exhibiting multipath and fading, the...