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8976911 Joint sequence estimation of symbol and phase with high tolerance of nonlinearity  
A method and system for a sequence estimation in a receiver, such as for use when receiving a sample of a received inter-symbol correlated (ISC) signal corresponding to a transmitted vector of L...
8873668 Communications arrangement for a system in package  
A circuit includes a first n-bit communications block and a second m-bit communications block. A controller is configured to control mode of operation for the first and second communications...
8761306 Method to prevent phenomenon in vector modulator transmitter  
One embodiment of the present invention relates to an apparatus for preventing remodulation in a transmission chain. A first offset generation circuit selectively introduces a first frequency...
8726318 Multimedia information receiving apparatus  
A multimedia information receiving apparatus receives multimedia information which is transmitted by a broadcast system and receives multimedia information which is simultaneously transmitted by...
8699557 Pipelined decision-feedback unit in a reduced-state Viterbi detector with local feedback  
A pipelined decision feedback unit (DFU) is disclosed for use in reduced-state Viterbi detectors with local feedback. The disclosed pipelined decision feedback unit improves the maximum data rate...
8666000 Reduced state sequence estimation with soft decision outputs  
A receiver may be operable to receive an inter-symbol correlated (ISC) signal, and generate a plurality of soft decisions as to information carried in the ISC signal. The soft decisions may be...
8660204 Data transmitter and method for forming symbol thereof  
Provided is a data transmission device and a symbol generation method of the same. A data processing unit of a data transmission device according to an embodiment of the present invention accesses...
8605832 Joint sequence estimation of symbol and phase with high tolerance of nonlinearity  
A method and system for a sequence estimation in a receiver, such as for use when receiving a sample of a received inter-symbol correlated (ISC) signal corresponding to a transmitted vector of L...
8599983 Methods and apparatus for clock and data recovery using transmission lines  
A clock and data recovery circuit may comprise a first transmission line comprising a plurality of segments of a first predetermined length. The first transmission line receives and propagates a...
8509321 Simultaneous bi-directional link  
A memory system with a simultaneous bi-directional link includes a controller, a memory device and a set of signal lines coupled to the controller and the memory device. Simultaneous communication...
8428196 Equalizing receiver  
A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device...
8345808 Methods and apparatus for narrow band interference detection and suppression in ultra-wideband systems  
An exemplary method is disclosed to accurately estimate the center frequency of a narrow-band interference (NBI). The exemplary method uses multi-stage autocorrelation-function (ACF) to estimate...
8279967 CDM signal transmitter with modulators reduced in number and a method therefor  
A code division multiplex signal transmitter includes an operational circuit, a modulator unit and a multiplexer. The operational circuit adds up input transmission data on channels to produce...
8223704 Apparatus and method for assigning subchannels in an OFDMA communication system  
An apparatus and method for assigning subchannels of a transmitter in a communication system. The method includes dividing an entire frequency band into m subcarrier groups; mapping each of the m...
8144249 Multi-slicing horizontal synchronization signal generating apparatus and method  
A multi-slicing horizontal synchronization signal generating apparatus and method is provided. The apparatus includes a slicer, a numerically controlled oscillator (NCO), a first phase detector, a...
8102936 Methods and apparatus for clock and data recovery using transmission lines  
A data receiver circuit includes a transmission line to generate the appropriate timing for clock and data recovery. The transmission line receives a reference signal, and propagates the reference...
7852965 Windowed level detector for partial response channels  
An estimator of the noiseless output of a noisy partial response channel is described. The estimator operates recursively. In each iteration, the estimator processes a window of the N most...
7839924 Partial response transmission system  
A partial response signaling system includes a transmitter circuit configured to equalize input data in response to a control signal and to transmit a partial response signal through a...
7801253 Nonlinear post-processors for channels with signal-dependent noise  
A non-linear post-processor for estimating at least one source of signal-dependent noise is disclosed. The post processor may receive a set of preliminary decisions from a sub-optimal detector...
7778346 Upstream power cutback  
An upstream signal power in a communication system is optimized. At least one system parameter is determined and a bits and gains table is modified. For example, a maximum received power parameter...
7609778 Methods, apparatus, and systems for reducing interference on nearby conductors  
In a method of data transmission according to one embodiment of the invention, data transitions on adjacent conductors are separated in time. In a method of data transmission according to another...
7502427 Asynchronous servo RRO detection employing interpolation  
A repeatable read-out (RRO) detector employs one or more digital interpolators to interpolate asynchronous sample values that represent RRO data. The asynchronous sample values are read from a...
7447278 Apparatus for transmitting and receiving data  
The apparatus for transmitting and receiving data according to the invention contains a transmitter (1) for serial data transmission and a receiver (3) for receiving a transmitted data signal...
7330513 Apparatus of transmitter and receiver for MIMO MC-CDMA system  
The invention relates to an apparatus of transmitter and receiver for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems. At the transmitter, modified...
7259929 Device and signal processing circuit for magnetic recording, magnetic recording apparatus  
A magnetic recording/reproducing apparatus includes a partial-response equalization circuit having frequency characteristic of cutting off low-frequency signal components inclusive of DC...
7167518 Bandwidth-efficient modulation in communication systems  
A transmitter of digital data includes a modulator with an input for a carrier signal and an input for a first stream of control symbols. The modulator modulates the carrier signal with a second...
7080311 Convolutional coding and decoding method and system  
A method of transmitting convolutionally encoded data with separate, independent and looped encoding over at least one data portion. The data is distributed over one or more cycles, and a...
7072414 Gaussian minimum shift keying (GMSK) precoding communication method  
A premodulation precoding method precodes a data sequence in a Gaussian minimum shift keying (GMSK) modulator to improve the bit error rate performance of a coherent Viterbi receivers generating...
6751276 Method and apparatus for decoding a digital signal  
A method of decoding a digital signal includes processing the digital using a delay operation in accordance with a frequency characteristic of 1+D, where D is an output signal of the delay...
6680978 Method and apparatus for nonlinear filtering and controlling the peak-to-average ratio  
A method and apparatus for providing a precoder filter having peak-to-average ratio (PAR) controller that also serves as a high-pass, low-pass, or band-pass filter. The described invention is...
6680980 Supporting ME2PRML and M2EPRML with the same trellis structure  
A Viterbi trellis is provided which allows for implementation of either an EPRML type channel or an E2PRML type channel using a single trellis structure. According to a specific embodiment, a...
6636560 Increased bit rate of telephony modems using controlled intersymbol interface  
The operation of a line card in the local exchange of a point-to-point switched telephone network is modified to increase the data rate of voiceband modem transmission by increasing the sampling...
6501812 Method for reading and demodulating data at different rates  
A digital signal processing circuit having a memory for storing a digital signal obtained from a playback channel; a controller for writing the digital signal in the memory at a first rate and...
6445754 Playback data detecting device  
The PR(1, 1) equalizer 1 receives signals which are provided from a playback head which detects data in which the number of continuous non-inverse bits is at least “2”. The PR(1, 1) equalizer 1...
6385255 Coding system and method for partial response channels  
A system and method for reading data to and writing data from multi-level (M-ary) partial response channels uses a trellis coder to encode an input bit stream sequence into a stream of multi-level...
6249398 Class of fixed partial response targets in a PRML sampled data detection channel  
A new class of fixed partial response targets are disclosed for use in a PRML magnetic medium read channel. The preferred embodiment exhibits an equalization response characterized by the...
6246731 Method and structure for increasing the maximum channel speed of a given channel  
Parallel processing in the form of two PR4 Viterbi Detectors connected in parallel operates to increase the maximum channel speed of a given data channel of a magnetic media. According to a target...
6246733 Synchronous interface for asynchronous data detection channels  
A synchronous interface is provided for an asynchronous channel, for example, a read channel for a variable velocity magnetic tape, the channel providing asynchronous samples of an input signal...
6246716 Information communication system  
The present invention is a communication system for communicatinginformation over greater distances than otherwise possible on bidirectional media subject tointerference, by reducing the...
6151365 Information detecting apparatus and method  
It is intended to reduce the rate of occurrence of prediction value judgment errors. Where a prediction value x'n-1 of a 1-clock preceding code is 0, a judgment circuit 1 outputs a value "1" as a...
6119265 Viterbi decoding method and viterbi decoding apparatus capable of increasing error rate  
In a Viterbi decoding apparatus operable under 6-value/4-state, most likelihood decoding is carried out, so that a shift between a reproduction signal and a reference amplitude level can be...
5940449 Signal processing system for digital signals  
In digital, magnetic and optical storage systems for audio/video/data, a Viterbi detector is extended by a control output, and a PLL is controlled by a variable delay line at the output or inside...
5857002 PRML channel with EPR4 equalization and clocking  
A method and apparatus for decoding a partial response encoded signal to generate a decoded signal. The first stage of the apparatus, a first delay filter, receives the partial response encoded...
5854717 Self-synchronization in a magnetic recording channel utilizing time-domain equalization  
Improved self-synchronization in a sampled magnetic recording channel employing time-domain equalization. The channel includes a time-domain equalizer which filters an input, readback signal to an...
5844741 System for reproducing high-density magnetic record data with viterbi detector for generating quadripartite reproduction data  
A system for reproducing data recorded on a magnetic recording medium at high density is provided as a simple configuration. Quadripartite reproduction data is output from a Viterbi detection...
5838738 Coding to improve timing recovery in a sampled amplitude read channel  
A partial response class-IV (PR4) read channel is disclosed for magnetic recording including a coding scheme which improves timing recovery by providing a more accurate phase error estimate. The...
5825824 DC-balanced and transition-controlled encoding method and apparatus  
A method and apparatus for producing a transition-controlled, DC-balanced sequence of characters from an input sequence of data bytes. The bits in each of the data bytes are selectively...
5774286 Magnetic disk drive in which read data is demodulated using maximum likelihood detection method  
In a magnetic disk drive for writing write data by a head to a magnetic disk, equalizing a reproduced signal read out from the magnetic disk by a head at the time of reproduction, and effecting...
5774505 Intersymbol interference cancellation with reduced complexity  
A signal processing channel and method for reducing intersymbol interference in a sequence of data symbols includes a pre-shaping filter for sharpening leading edges of data symbols and providing...
5768320 Read system for implementing PR4 and higher order PRML signals  
A read system for implementing PR4 and higher order PRML signals includes: a continuous time programmable filter, for receiving a read signal representative of a binary signal from a storage...

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