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| Number | Title | Issue Date |
| 7443909 | Weighted autocorrelation method for downlink CDMA LMMSE equalizers Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by p... | 10/28/2008 |
| 7433418 | Method and apparatus for efficient storage of training sequences for peak to average power constrained modulation formats Some embodiments store a training sequence in a communications system. The stored training sequence exhibits certain desirable characteristics when used by a peak to average power constrained modulation format. In one embodiment, a set of original ordered sequences ... | 10/07/2008 |
| 7386240 | Dispersion compensation in optical systems In one aspect a system and method for providing a multi-port memory having a plurality of read ports, each read port including a filter coefficient value representing a dispersion compensation value associated with an optical link. The method includes processing an ... | 06/10/2008 |
| 7352827 | Multichannel simultaneous real time spectrum analysis with offset frequency trigger An instrumentation receiver for multichannel simultaneously realtime spectrum analysis with frequency trigger offset inputs a wideband IF signal derived from a wideband RF signal by the receiver to both a wideband IF channel and a narrowband IF channel simultaneousl... | 04/01/2008 |
| 7340657 | On-chip high-speed serial data analyzers, systems, and associated methods In an embodiment, a method includes forming a plurality of time/voltage points from a number of voltage values and from a number of time values, generating serialized data having a predetermined number of bits, comparing the serialized data to a set predetermined vo... | 03/04/2008 |
| 7130341 | Feed forward equalizer controlled by FEC correction rates A method of signal equalization of a transmitted bit stream by means of a feed forward equalizer is provided, whereby the signal is decomposed into at least two components and the components are multiplied with equalization parameters to form equalized components, w... | 10/31/2006 |
| 7113559 | Efficient methods for filtering to avoid inter-symbol interference and processing digital signals having large frequency guard bands A circular filtering system that prevents the problem of inter-symbol interference. The circular filtering system utilizes a buffer memory to store samples of a given symbol and provide only these samples to a linear filter such that the output of the filter, for an... | 09/26/2006 |
| 7110482 | Method and apparatus for tracking invalid signals through a digital system A tracking apparatus identifies distorted output signals from a digital system caused by at least one distorted signal input to the digital system. A first signal is input to the tracking apparatus when a distorted signal is input to the digital system. A second sig... | 09/19/2006 |
| 7039004 | Decision feedback channel estimation and pilot tracking for OFDM systems Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel esti... | 05/02/2006 |
| 6952238 | Method and apparatus for echo cancellation in digital ATV systems using an echo cancellation reference signal A novel echo cancellation reference (“ECR”) training signal is inserted into the current ATSC 8 VSB data stream to achieve improved echo rejection while maintaining compatibility with the ATSC 8 VSB digital ATV standard. The novel ECR training signal is also sui... | 10/04/2005 |
| 6947481 | Code enhanced equalization based upon a reliability factor A receiver includes an equalizer and a decoder which decodes data from a signal. The signal is based upon an output of the equalizer. The receiver also includes an encoder, which re-encodes the decoded data, and an error generator, which generates an error vector ba... | 09/20/2005 |
| 6940898 | Adaptive coefficient signal generator for adaptive signal equalizers with fractionally-spaced feedback An adaptive coefficient signal generator for use in an adaptive signal equalizer with fractionally-spaced feedback. The signals representing the feedback tap coefficients are generated in conjunction with a timing interpolation parameter such that the fractionally-s... | 09/06/2005 |
| 6816204 | Ghost cancellation reference signals for broadcast digital television signal receivers and receivers for utilizing them Broadcast DTV signals are improved by including in each of their successive data fields a training signal for the adaptive channel-equalization and echo-cancellation filtering in receivers. The training signal in each data field includes a prescribed number of cycle... | 11/09/2004 |
| 6738420 | Digital filter having an upsampler operational at a fractional clock rate A digital filter includes a number of coefficient generators that are clocked by a clock having a frequency including an undesired component. The coefficient generators, which each have a number of states, are communicatively coupled to multipliers that receive inco... | 05/18/2004 |
| 6674795 | System, device and method for time-domain equalizer training using an auto-regressive moving average model A system, device, and method for time-domain equalizer (TEQ) training determines the TEQ order and TEQ coefficients by applying the multichannel Levinson algorithm for auto-regressive moving average (ARMA) modeling of the channel impulse response. Specifi... | 01/06/2004 |
| 6587504 | Adaptive equalizer and designing method thereof Following arrangement of an adaptive equalizer with a direct filter structure according to the least mean square error architecture, look ahead conversion of modifying a tap coefficient of the next cycle utilizing the tap coefficient of a predetermined pr... | 07/01/2003 |
| 6549088 | Frequency adjustable multipole resonant waveguide load structure A resonant waveguide load structure is provided for use in waveguide systems. The load structure includes a length of waveguide which is open at one end and closed at the other end. The load structure also includes a support pin mounted inside the wavegui... | 04/15/2003 |
| 6498789 | CDMA mobile communications device In a CDMA mobile communications device, a long code generator can be eliminated from a receiving section by storing a received long code at an output timing of a decimating section 11 through calculation of a write address of a FIFO buffer 12a, calculatin... | 12/24/2002 |
| 6222876 | Detecting valid data patterns for adapting equalization gain and offset for data transmissions A method for tuning an adaptive equalizer in order to receive digital signals from a transmission medium both coarse and fine tuning methods to adaptively equalize a signal received from the transmission medium. The coarse tuning method adjusts an equaliz... | 04/24/2001 |
| 6167080 | Control loop for adaptive equalization of a data signal A closed feedback loop controls the adaptive equalization of an incoming data signal received via a cable. Detected signal information about the positive and negative peaks of the incoming data signal during different windows in time is processed to gener... | 12/26/2000 |
| 6047026 | Method and apparatus for automatic equalization of very high frequency multilevel and baseband codes using a high speed analog decision feedback equalizer A decision feedback equalizer circuit employing a current mode finite impulse response (FIR) filter. A decision feedback equalizer circuit comprises an attenuator block for scaling a received voltage signal, a first transconductor (voltage-to-current conv... | 04/04/2000 |
| 5970094 | Adaptive equalizer employing filter input circuit in a circular structure An equalizer for filtering a received signal to generate a filtered signal. The equalizer includes: data supply means, receiving the filtered signal, for generating N number of window data samples on a symbol-by-symbol basis by using (N+1) number of delay... | 10/19/1999 |
| 5768311 | Interpolation system for fixed sample rate signal processing Using digital signal processing in a modem attached to a digital line, the modem sample rate for both transmit and receive signals is interpolated or decimated to the time slot rate of a digital channel connected to the modem by filters which are operated... | 06/16/1998 |
| 5530721 | Equalizer and terminal device for mobile communications An equalizer for use in a receiving system of a code transmission system has a plurality of series-connected delay elements, a plurality of coefficient units for weighting tap output signals extracted in parallel from the delay elements, an adder for addi... | 06/25/1996 |
| 5422909 | Method and apparatus for multi-phase component downconversion The present invention provides a downconverter method and apparatus for downconverting a multiphase modulated signal. The downconverter can be implemented in a multi-phase receiver such as a quadrature receiver. An analog-to-digital converter (103) conver... | 06/06/1995 |
| 5331663 | Decision-feedback equalizer capable of producing an equalized signal at a high speed without a remaining fading In a decision-feedback equalizer for use in combination with a demodulator (13) to equalize a demodulated signal into an equalized signal through a transversal filter (15), the transversal filter filters the demodulated signal into a filtered signal in ac... | 07/19/1994 |
| 5307375 | Two stage accumulator for use in updating coefficients A two stage accumulator is provided for updating coefficients. The accumulator is particularly useful in an adaptive equalizer. A first stage of the accumulator receives an error word and outputs sign and carry bits resulting from the addition of the erro... | 04/26/1994 |
| 5150380 | Receiver capable of removing both intersymbol interference and frequency offset In a receiver responsive to a reception signal subjected to an intersymbol interference and a frequency offset, the reception signal is delivered to a matched filter having a filter characteristic matched with a transmission path and filtered into a filte... | 09/22/1992 |
| 5105440 | Method and apparatus for adaptive equalization of pulse signals A method and apparatus are provided for adaptive equalization of distorted pulse signals with different pulse train speeds, particularly for bipolar signals. The edge time deviations of a signal derived from the pulses output from a variable equalization ... | 04/14/1992 |
| 5005185 | Parallel mode adaptive transversal equalizer for high-speed digital communications system In a parallel-mode adaptive transversal equalizer, P- and Q-channel data streams from A/D converters (1, 5) are respectively passed through the tapped-delay lines of trasversal filters (2, 6), on the one hand, and are one-symbol delayed, on the other, by ... | 04/02/1991 |
| 4979184 | Automatic equalizer initialization time control for multipoint networks An apparatus monitors the convergence of the equalization training sequence in a multipoint communication network. Various latches record the period of the incoming sequence and the time to convergence, if any. A counter records the number of periods free... | 12/18/1990 |
| 4791390 | MSE variable step adaptive filter A very rapidly converging adaptive filter which uses a variable scale factor for each weight of the filter. The value of the variable scale factor is chosen for each iteration and is based upon the sign changes of the incremental weight change. The variab... | 12/13/1988 |
| 4716577 | Autoequalizer An autoequalizer having first and second data stores, first and second coefficient stores along with first and second multipliers for multiplying each stored data sample times its corresponding stored coefficient is disclosed. First and second accumulator... | 12/29/1987 |
| 4635276 | Asynchronous and non-data decision directed equalizer adjustment Equalizers, which provide distortion compensation for a modulated carrier signal having a time-varying signal envelope, are adjusted at selected times in response to the signal envelope and the data signals regenerated therefrom. Each selected time corres... | 01/06/1987 |
| 4580275 | Adaptive equalizer for binary signals and method of operating same An adaptive equalizer for high-speed binary signals, operating in baseband, comprises a transversal filter receiving digitized samples of incoming symbols and feeding them to a decision stage. An error signal derived from the difference between the filter... | 04/01/1986 |
| 4559635 | Auto-adaptive amplitude-equalizing arrangement for digital radio links An auto-adaptive amplitude-equalizing arrangement for digital radio links having an intermediate-frequency signal input, a transversal filter and a circuit for the control of the filter. The transversal filter comprises a delay circuit providing, with res... | 12/17/1985 |
| 4500999 | Line equalizer A line equalizer including a Ýa;f equalizer for compensating a Ýa;f-characteristic of a transmission line, a BT equalizer connected in series with the Ýa;f equalizer for removing an echo component caused by a bridged tap (namely, BT) on the tr... | 02/19/1985 |
| 4459698 | Variable equalizer A small-sized LSI variable equalizer is provided for accurately equalizing waveforms of signals transmitted via transmission lines of different distances. Variable equalizer units capable of stepwise changing the equalizing characteristics thereof are con... | 07/10/1984 |
| 4438521 | Automatically adaptive transversal filter A method and apparatus for the adaptive equalizing of phase and amplitude distortion in a received signal by an N-stage digital delay line system and comprising the steps of digitally sampling the received signal and advancing each digital sample through ... | 03/20/1984 |
| 4349889 | Non-recursive filter having adjustable step-size for each iteration Arrangement having a non-recursive filter and means for weighting a sequence of delayed versions of the input signal in accordance with a sequence of coefficients which are each adjusted iteratively by positive and negative correction steps, respectively,... | 09/14/1982 |
