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| Number | Title | Issue Date |
| 8122327 | Symbol-level soft output viterbi algorithm (SOVA) and a simplification on SOVA A method and apparatus for processing symbols of a block code is presented. A sequence of symbols is received, e.g., from an inter-symbol interference (ISI) channel. A soft value is determined for each symbol using a binary trellis. ... | 02/21/2012 |
| 8086940 | Iterative decoding between turbo and RS decoders for improving bit error rate and packet error rate A technique for iterative decoding between turbo and Reed Solomon (RS) decoders for improving bit error rate (BER) and packet error rate (PER) in a receiver in a wireless communication system comprises receiving data samples comprising turbo encoded packets and RS c... | 12/27/2011 |
| 7653865 | Decoding method and device A symbol sequence in a received DS-CDMA signal is decoded in an efficient manner in order to reduce the processing needs in a receiver when, e.g., processing acquisition indicators (AI) in a UMTS system. The decoding comprises iterative calculation of a hard-decisio... | 01/26/2010 |
| 7404138 | Apparatus and method for encoding and decoding TFCI in a mobile communication system Disclosed is an apparatus for encoding k consecutive inputs indicating a TFCI (Transport Format Combination Indicator) of each of successively transmitted frames into a sequence of m symbols in an NB-TDD (Narrowband-Time Division Duplex) mobile communication system.... | 07/22/2008 |
| 7398453 | Method and apparatus for a low-density parity-check decoder A low-density parity-check (LDPC) decoder (304) has a memory (308), and a processor (306). The processor is programmed to initialize (202) the LDPC decoder, calculate (204) a probability for each check node, calculate (206) ... | 07/08/2008 |
| 7392453 | Embedding auxiliary data in an information signal Information signals such as grayscale images or audio signals are represented as a sequence of PCM signal samples. To embed auxiliary data in the least significant bits of the signal, the samples are slightly distorted. There is a so-termed “rate-distortion functi... | 06/24/2008 |
| 7336715 | Method for coded modulation taking account of the error sensitivity of the user data and encrypting said data after coding A method of coded modulation of digital data is described, the digital data being divided into parallel signal streams, and the useful bits then being channel coded at different code rates according to their error susceptibility. The useful bits channel coded differ... | 02/26/2008 |
| 7305403 | Method and device for storing linked lists The invention provides for a method, a device, a use of the method and a computer program, all of which increase the security of linked lists for the storage of data. This is achieved by an improved protection against the destruction of data caused by defective poin... | 12/04/2007 |
| 7292642 | Reference symbol multicarrier signal designed to limit intersymbol interference The invention relates to a multicarrier signal consisting of a temporal succession of symbols formed by a set of data elements, each of said data elements modulating a carrier frequency of said signal, said symbols being organized in successive frames each comprisin... | 11/06/2007 |
| 7269186 | Protocol for framing a payload Systems and techniques for establishing a communication link wherein a transmission source delimits frame boundaries of a payload, calculates a value as a function of a subset of the payload, and appends the value to the payload within the frame boundaries before tr... | 09/11/2007 |
| 7237180 | Symbol-level soft output Viterbi algorithm (SOVA) and a simplification on SOVA A method and apparatus for processing symbols of a block code is presented. A sequence of symbols is received, e.g., from an inter-symbol interference (ISI) channel. A soft value is determined for each symbol using a binary trellis. ... | 06/26/2007 |
| 7230994 | Multi-level modulation apparatus, multi-level demodulation apparatus, multi-level modulation/demodulation communication system, program and modulation/demodulation method In a QAM modulation system, (3p+1) or (3p+2) input signal strings, where p is an integer not less than 3 or 2, are converted into three (p+1) string signals which are then allocated to three phase planes. The converted three (p+1) string signals are time-division mu... | 06/12/2007 |
| 7221688 | Method and apparatus for receiving a digital audio broadcasting signal A method for processing a composite digital audio broadcasting signal including an analog modulated portion in a central frequency band and digitally modulated portions in upper and lower sidebands with respect to the central frequency band, the method comprises the... | 05/22/2007 |
| 7165208 | Apparatus and method for encoding and decoding TFCI in a mobile communication system Disclosed is an apparatus for encoding k consecutive inputs indicating a TFCI (Transport Format Combination Indicator) of each of successively transmitted frames into a sequence of m symbols in an NB-TDD (Narrowband-Time Division Duplex) mobile communication system.... | 01/16/2007 |
| 7126926 | Multi-tier wireless communications architecture, applications and methods Multi-tier system for digital radio communication. The multi-tier system has a first-tier base station with relatively long-range radio and has a second-tier base station with relatively short-range, low power and cheaper radios. The system can be more versatilely c... | 10/24/2006 |
| 7106742 | Method and system for link fabric error detection and message flow control A digital data system employs multiple error protection mechanisms on messages that pass along a link interconnect fabric from one node or device to another node or device. The nodes may be end points (such as processor or storage units), or may be intermediate devi... | 09/12/2006 |
| 7099190 | Data storage system A data storage system, which includes a plurality of pages, each of which includes a plurality of first memory cells, from which at least binary data can be read-out a plurality of times without destruction; a circuit which receives data-output of at least one first... | 08/29/2006 |
| 7085988 | Hashing system utilizing error correction coding techniques A hashing system produces hash values by manipulating n-bit sequences in accordance with a selected distance d error correction code (“ECC”) over an associated Galois Field. The current system produces a hash value for a given n-bit sequence by treating the sequ... | 08/01/2006 |
| 7036067 | Error detection for multi-stream communications According to an embodiment of the invention, a method and apparatus are described for error detection for multi-stream communication. Under an embodiment of the invention, a method for producing an error word for a data stream comprises computing an intermediate err... | 04/25/2006 |
| 7035894 | Method for retransmitting data efficiently in mobile communication system A method for retransmitting data between two sides including a reception side and a transmission side in a mobile communication system including one or more mobile stations and one or more radio networks includes the steps of: by the reception side, storing data rec... | 04/25/2006 |
| 7030789 | Techniques for applying modulation constraints to data using periodically changing symbol mappings Techniques are provided for applying modulation constraints to data by using periodically changing symbol mappings to replace certain prohibited error prone data patterns. Initially, user data in a first base is mapped to integers of a second base using a base conve... | 04/18/2006 |
| 7032152 | Method of channel coding A method is provided for channel coding a parameter whose values are correlated with one another to different extents and according to which code words with better distance properties are at least partially associated with the more strongly correlated values of the ... | 04/18/2006 |
| 7016298 | Signal transmission/reception system of orthogonal frequency division multiplexing A transmission apparatus of orthogonal frequency division multiplexing for multiplexing a plurality of carriers orthogonal to one another to transmit a modulated signal. The transmission apparatus includes a first modulator for outputting a code modulated in accorda... | 03/21/2006 |
| 7010469 | Method of computing partial CRCs A method of calculating partial CRCs on-the-fly is provided without the need for pre-computed tables and without size restrictions on data blocks or packets. The method works for both fixed and variable length data blocks by computing the remainders of the powers of... | 03/07/2006 |
| 7003710 | Communications method, communications apparatus and communications system using same communications apparatus A communications method carries out error-correction encoding of data, generation of a suitable packet in accordance with a retransmission request from a receiving side, and transmission of the packet to the receiving side, from a transmission side. In the receiving... | 02/21/2006 |
| 6959412 | Error correction coding utilizing numerical base conversion for modulation coding A method of encoding data includes representing the data as number(s) in a first base. The method further includes converting the number(s) into a number(s) in a second base. The resultant number in the second base can be viewed as data suitable for encoding using a... | 10/25/2005 |
| 6530058 | Method for correction of errors in a binary word stored in multilevel memory cells, not requiring additional cells A method corrects the errors in a multilevel memory, by increasing the number of levels of the memory cells, instead of adding further memory cells. In other words, the present correction method is based on the principle of storing, in each multilevel mem... | 03/04/2003 |
| 6421806 | Information transfer method and device, information receiving method and device and network stations using them The information transfer method uses: an alphabet Z2.sub.t ={0, 1, 2, . . . 2t -1}, tࣙ3, in which additions and multiplications are carried out modulo 2t, and a lifted Hamming code whose generator polynomial is in Z | 07/16/2002 |
| 6212662 | Method and devices for the transmission of data with transmission error checking The invention concerns a method and devices for the detection of errors, in particular transmission errors, in data streams and/or data packets. In order to better detect systematic errors in particular, the error detection function according to the inven... | 04/03/2001 |
| 6173431 | Method and apparatus for transmitting and receiving information packets using multi-layer error detection A communication device employs a method and apparatus for transmitting and receiving information packets using multiple layers of error detection. A sending communication device constructs an information packet to include user information divided into mul... | 01/09/2001 |
| 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 avoided, and a better error rate can be obtained. The Viterbi dec... | 09/12/2000 |
| 6085349 | Method for selecting cyclic redundancy check polynomials for linear coded systems The method for selecting CRC polynomials (or CRC generators) for linear coded systems. In the exemplary embodiment, a communication system utilizes a concatenated code comprising a CRC code and a convolutional code. The CRC generators are selected based o... | 07/04/2000 |
| 5850403 | Process of selectively protecting information bits against transmission errors Based on the sequence of the information bits to be transmitted, the coder forms a second sequence of bits cn, which includes a redundant subset. A differential coding of the form dn =cn .sym.df(n) with f(n) | 12/15/1998 |
| 5805613 | Methods for efficient bounded-distance decoding of the Hexacode and associated decoders for the Leech Lattice and the Golay code A method for bounded distance decoding of symbols received in transmission when the original symbols belonged to a Block code featuring series of symbols forming legitimate codewords whose metric distance from the received transmission is measured in Squa... | 09/08/1998 |
| 5583872 | High speed data transfer over twisted pair cabling A method provides for a first network node in a plurality of network nodes to transmit a data packet to a hub. The hub and the network nodes are interconnected within a local network system. Control signals are exchanged between the first network node and... | 12/10/1996 |
| 5537382 | Partial response coding for a multi-level optical recording channel A system and method for recording multi-level data to a multi-amplitude recording channel encodes binary data to form multi-level data. The multi-level data are recorded to the storage media for later recall. The system utilizes linear, multi-amplitude re... | 07/16/1996 |
| 5448592 | Coded QAM system A block of output symbols is generated, using quadrature amplitude modulation, from a block of input bits. The input bits are processed, using one or more redundant codes having a Hamming distance greater than one, to produce digital words which control t... | 09/05/1995 |
| 5430743 | Method and apparatus for recovering data in a radio communication system A radio communication system receiver employs a demodulator (104) to recover a received signal. The receiver of the present invention further includes a channel quality estimator (222) for estimating a characteristic of the communication channel over whic... | 07/04/1995 |
| 5408499 | Multilevel code for transmission device Multilevel coded modulation equipment includes a transmission unit and a reception unit. The transmission unit includes a first converting unit, a first encoding unit, a first differential encoding unit, a second encoding unit, a mapping unit, and a modul... | 04/18/1995 |
| 5390195 | Miller-squared decoder with erasure flag output A method and apparatus for the generation of a signal flag in response to illegal channel code patterns from an information channel, the signal flag may typically be used as an erasure flag by a subsequent error correction decoder. This erasure flag, bein... | 02/14/1995 |
