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| Number | Title | Issue Date |
| 8175201 | Systems and methods for adaptive equalization in recording channels Various embodiments of the present invention provide systems and methods for performing adaptive equalization. For example, various embodiments of the present invention provide methods for adaptive equalization that include providing a data processing system with an... | 05/08/2012 |
| 8098780 | Rake receiver finger assignment based on signal path concentration A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the ex... | 01/17/2012 |
| 8064554 | Radio communication system performing multi-carrier transmission, reception device, reception method, transmission device, transmission method, delay time calculation device, and delay time calculation method Multi-carrier transmission is performed without inserting a repetitive signal into guard interval periods. A transmitter provides guard interval periods by using a null signal to save transmission power and prevent the deterioration of the SN ratio. Delayed waves at... | 11/22/2011 |
| 8000420 | System and method of joint synchronization and noise covariance estimation A system and method in a radio receiver for joint synchronization and noise covariance estimation of a received signal. A spatially and temporally stacked signal model, whereby successive samples of temporally adjacent received signal vectors and corresponding train... | 08/16/2011 |
| 7991091 | Radio communication system, receiver, receiving method, transmitter, transmitting method, and device for and method of calculating delay times for multi-carrier transmission Multi-carrier transmission is performed without inserting a repetitive signal into guard interval periods. A transmitter provides guard interval periods by using a null signal to save transmission power and prevent the deterioration of the SN ratio. Delayed waves at... | 08/02/2011 |
| 7974372 | OFDM receiving method and receiving apparatus Disclosed is an OFDM receiving apparatus for receiving a signal that has sustained inter-symbol interference owing to a delayed wave that exceeds a guard interval, eliminating at least inter-symbol interference from the receive signal and applying demodulation and d... | 07/05/2011 |
| 7912161 | Method and apparatus for layer 1 / layer 2 convergence declaration for an adaptive equalizer A novel method and apparatus is disclosed, that embeds with, or otherwise makes available to an adaptive equalizer, suitable for use in IEEE 1OG-LRM standard compliant receivers, digital logic that monitors some of the Layer 1 and preferably some of the Layer 2 proc... | 03/22/2011 |
| 7876868 | System and method for reducing interference in an orthogonal frequency division modulation system An interference contribution associated with a selected subcarrier of a plurality of subcarriers associated with a previously transmitted OFDM symbol or a current OFDM symbol is determined. A fast Fourier transform (FFT) output for the current OFDM symbol is also de... | 01/25/2011 |
| 7856073 | Digital gain adjustment in a wireless receiver A radio receiver includes a communication interface, a mixing module, an analog to digital converter, a digital gain block, and a gain setting block. The communication interface receives a continuous time radio signal. The mixing module down converts the continuous ... | 12/21/2010 |
| 7826572 | Dynamic optimization of overlap-and-add length A method of adjusting overlap-and-add length for zero-padded suffixes. The method includes, based on a channel impulse response, estimating an effective channel length. When the effective channel length is less than a default overlap-and-add length and greater than ... | 11/02/2010 |
| 7809096 | Adaptive interference cancellation algorithm using speech mode dependent thresholds The present invention provides a method of processing radio frequency (RF) bursts dependent on a speech mode associated with data contained within the RF burst. Different voice modes, full rate, half rate, and adaptive multi-channel rates each may require different ... | 10/05/2010 |
| 7782987 | Method and apparatus for received signal quality estimation A processing circuit and method generate signal quality estimates based on scaling measured inter-symbol interference (ISI) in a received signal according to a cancellation metric corresponding to ISI cancellation performance of the receiver. By accounting for ISI c... | 08/24/2010 |
| 7711077 | System and method for high-speed decoding and ISI compensation in a multi-pair transceiver system A method and a system for providing ISI compensation to an input signal in a bifurcated manner. ISI compensation is provided in two stages, a first stage compensates ISI components induced by characteristics of a transmitter's partial response pulse shaping filter, ... | 05/04/2010 |
| 7702053 | State based algorithm to minimize mean squared error Data error such as mean square error may be reduced in a system such as a communication receiver using a dithering algorithm that adjusts one or more parameters in the system. The dithering algorithm may be applied to more than one parameter. The dithering algorithm... | 04/20/2010 |
| 7693241 | Rake receiver finger assignment based on signal path concentration A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the ex... | 04/06/2010 |
| 7668268 | Lower complexity computation of lattice reduction A signal vector is received over a plurality of channels. A channel matrix H is determined that represents at least one of the plurality of channels. An iterative algorithm such as Lenstra-Lenstra-Lovasz is used to determining a change of basis matrix T that when mu... | 02/23/2010 |
| 7656976 | Systems and methods for multicarrier modulation using multi-tap frequency-domain equalizer and decision feedback Through the use of feedback in determining frequency domain equalization, intersymbol interference can be reduced. Specifically, the determined constellation point closest to the determined received point can be fed back to aid in determining one or more other close... | 02/02/2010 |
| 7639762 | Method for receiving and recovering frequency shift keyed symbols A receiver architecture for receiving an FSK signal having a predetermined number of modulation levels includes a selectivity filter (206) for selectively passing a wanted channel and rejecting unwanted channels. The selectivity filter has a filter bandwidth ... | 12/29/2009 |
| 7623603 | Intersymbol interference mitigation Embodiments of the present invention provide for computing spatial covariances of intersymbol interference (ISI) and using the computed spatial covariances for ISI mitigation. Other embodiments may be described and claimed. ... | 11/24/2009 |
| 7599455 | Method and apparatus for determining an output sequence from an input sequence A method and a device for determining an output sequence of output elements from an input sequence of input elements is provided, the method or the device being implemented according to a decision feedback equalizer. The adaptation of coefficients of the equalizer i... | 10/06/2009 |
| 7583768 | Apparatus for canceling intersymbol interference in semiconductor memory device and method thereof We provide an ISI canceling circuit including a storing unit to store an ISI value associated with a received signal, an operator to generate an operator output signal by subtracting the ISI value from the received signal, and a comparator to manipulate the operator... | 09/01/2009 |
| 7508892 | Receiver circuit comprising equalizer A receiver circuit has an equalizer that equalizes a received signal propagating through a transmission medium; a data detection circuit that detects an analog output signal of the equalizer at a data sample timing and outputs a digital signal; an intersymbol interf... | 03/24/2009 |
| 7489749 | Optimum phase timing recovery in the presence of strong intersymbol interference A data communication device with a receiver for receiving and processing incoming signal having intersymbol interference component to produce resultant signals with less interference. The processor includes a timing recovery processor for recovering a clock signal f... | 02/10/2009 |
| 7460626 | Method and apparatus of detecting ISI/ICSI in an OFDM system A method for detecting inter-carrier-symbol interference (ICSI) in an OFDM system includes the steps of computing a first correlation value representing the correlation between at least one of first signals of a first symbol and at least one of second signals of a s... | 12/02/2008 |
| 7453966 | Gradient based method and apparatus for OFDM sub-carrier power optimization In one aspect thereof this invention provides a method to increase data throughput in an Orthogonal Frequency Division Multiplex (OFDM) wireless communications system. The method includes modeling data throughput as a function of received Signal to Noise Ratio (SNR)... | 11/18/2008 |
| 7443913 | High speed decision feedback equalizer An equalizer comprises a sampler, a filter, and a summer. The sampler samples a signal indicative of an input communication signal to determine digital decision output signals having a communication device data rate. The filter receives digital decision output signa... | 10/28/2008 |
| 7440507 | Turbo channel estimation for OFDM systems A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symb... | 10/21/2008 |
| 7440497 | Serial data link using decision feedback equalization A multi-phase adaptive decision feedback equalizer minimizes post-cursor inter-symbol interference in a current data bit based on values of subsequent data bits in a data communication system. In one form, the receiver includes a plurality of modules each having a r... | 10/21/2008 |
| 7437135 | Joint channel equalizer interference canceller advanced receiver At least one communication is transmitted from a plurality of transmitting antennas. A signal is received. For each transmitting antenna, the received signal is equalized with respect to a channel experience by the communication between the transmitting antenna and ... | 10/14/2008 |
| 7436881 | Per-bin DFE for advanced OQAM-based multi-carrier wireless data transmission systems An Apparatus for non-linear per-bin adaptive equalization in orthogonal multi-carrier data transmission systems with the Nyquist sub-channel spectral shaping and T/2 staggering of in-phase and quadrature components is disclosed. A previously introduced linear equali... | 10/14/2008 |
| 7433428 | Method of reducing the variance of the signal-to-noise rate estimated for a signal with amplitude differential phase-shift keying modulation This method reduces the variance of the estimation of the signal-to-noise rate in a multiuser digital communications system. These communications require a sending of a phase reference symbol prior to sending a information, where the estimation is made of the signal... | 10/07/2008 |
| 7428276 | Method and apparatus for channel impulse response estimation in GSM systems A method for estimating channel impulse response (CIR) in a communication system includes converting RF analog signals to obtain baseband digitized signals, sampling the baseband digitized signals according to the symbol period or bit period, cross-correlating at le... | 09/23/2008 |
| 7428278 | Method and apparatus for parallel midamble cancellation Method and apparatus for performing midamble cancellation to remove midamble interference from the convolution tail of data field 1 and the first W-1 chips of the midamble field which results from the delay spread of the multipath channel and for canceling the first... | 09/23/2008 |
| 7428265 | Systems and methods for optimal symbol spacing to minimize intersymbol interference in a receiver A network includes a transmitter for transmitting a stream of known symbols and unknown symbols in an optimal distribution through a transmission channel to a receiver that receives the transmitted stream of known symbols and unknown symbols distorted by intersymbol... | 09/23/2008 |
| 7421032 | Serial concatenation of interleaved convolutional codes forming turbo-like codes A serial concatenated coder includes an outer coder and an inner coder. The outer coder irregularly repeats bits in a data block according to a degree profile and scrambles the repeated bits. The scrambled and repeated bits are input to an inner coder, which has a r... | 09/02/2008 |
| 7418061 | Receiver having decisional feedback equalizer with remodulation and related methods A receiver includes a filter stage that receives, filters, and equalizes a received signal, and a decisional feedback loop coupled to the filter stage that receives and processes a signal output from the filter stage using remodulation. The decisional feedback loop ... | 08/26/2008 |
| 7418212 | Electrical detection of optical symbols A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 7415086 | Multi-channel communication system for multiple input, multiple output processing of an encoded signal A method and apparatus is disclosed for processing two or more encoded signals received over a multi-channel communication system to cancel or mitigate coupling and the effects of the channel on the two or more encoded signals. In one embodiment a multi-channel comm... | 08/19/2008 |
| 7415081 | Orthogonal frequency division multiple signal reception apparatus, reception apparatus, orthogonal frequency division multiple signal reception method, and reception method Reception timing of a signal consisting of a valid symbol section and a guard interval section is controlled properly. According to a result of auto-correlation calculation performed by a guard correlation processor, a timing adjustment block generates a control vol... | 08/19/2008 |
| 7415085 | OFDM receiver An OFDM receiver receives an OFDM signal transmitted from an OFDM transmitter by using a sub-carrier. The OFDM receiver includes a channel estimator configured to obtain a channel estimated value of each multi-path based on OFDM signals received through a plurality ... | 08/19/2008 |
