Steven D Mclaughlin

US Patent:

6385255, May 7, 2002

Filed:

Aug 6, 1999

Appl. No.:

09/369746

Inventors:

Steven W. McLaughlin - Decatur GA
David C. Lee - Berkeley CA
Jonathan A. Zingman - Oakland CA
John L. Fan - Palo Alto CA

Assignee:

Calimetrics, Inc. - Alameda CA

International Classification:

H03M 516

US Classification:

375263, 375290, 375341, 360 40, 369 18

Abstract:

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 data symbols. The data symbols are written to the partial response channel using any of a number of techniques. Preferably, the trellis coder anticipates the modulation transfer function of the partial response channel in encoding the data. Because the partial response channel has its own transfer function, the relationship between the data read from the channel and the actual input data bits is a function not only of the data encoder but also of the partial response channel. Therefore, a decoder specification used to implement the decoder takes into account the effect of the trellis encoder as well as the effect of the partial response channel.

US Patent:

6842873, Jan 11, 2005

Filed:

Jan 22, 2002

Appl. No.:

10/057774

Inventors:

Steven W. McLaughlin - Decatur GA, US
Andrew Thangaraj - Atlanta GA, US

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H03M 1300

US Classification:

714709, 714752

Abstract:

A computer program product, apparatus, and method for correcting errors introduced into a set of data bits during transmission of the set of data bits over a channel includes determining a confidence measure for each data bit based only on the values of one or more of the data bits, each confidence measure representing the probability that the value of the corresponding data bit is correct; and changing the value of a given data bit when the confidence measure for the given data bit indicates that the value of the given data bit is not correct, thereby producing a corrected data bit.

US Patent:

6847760, Jan 25, 2005

Filed:

Jul 24, 2002

Appl. No.:

10/202277

Inventors:

Cenk Argon - Atlanta GA, US
Steven William McLaughlin - Decatur GA, US
Ketan Patel - Yardley PA, US
Stephen E. Ralph - Atlanta GA, US

Assignee:

Georgia Tech Research Corporation - Atlanta GA

International Classification:

G02B 626
H04J 1402

US Classification:

385 28, 385 27, 385 31, 385 88, 385 24, 398 81, 398 44, 398 82

Abstract:

A system is described that includes a system for correcting modal dispersion and errors in an optical fiber system. The system includes a multisegment photodetector coupled to an end of an optical fiber for detecting optical signals exiting the optical fiber and for converting the optical signals to an electrical output, the multisegment photodetector including a plurality of photodetector regions configured such that one of the plurality of photodetectors regions intercepts a mode in a manner distinct from another of the plurality of photodetectors. The system also includes logic configured to receive a resultant signal output from the photodetector regions and provide forward error correction decoding of the resultant signal.

US Patent:

6898756, May 24, 2005

Filed:

Mar 15, 1999

Appl. No.:

09/268555

Inventors:

Faramarz Fekri - Atlanta GA, US
Steven W. McLaughlin - Decatur GA, US
Russell M. Mersereau - Atlanta GA, US
Ronald W. Schafer - Atlanta GA, US

Assignee:

Georgia Tech Research Corporation - Atlanta GA

International Classification:

H03M013/03

US Classification:

714786, 714746

Abstract:

A system and method for enabling efficient error correction and encryption using wavelet transforms over finite fields. The system and method utilizes the combination of a channel encoder and channel decoder to correct errors to source data after transmission over a physical channel or storage in a storage medium. The channel encoder mathematically generates a set of wavelet coefficients by performing a combination of filtering and/or processing of a received message vector. The wavelet coefficients are then utilized by the channel encoder to cause its filters to transform message data into transmission data. The channel decoder receives the transmitted source data in the form of a code word/channel error combination and performs filtering to render a syndrome, representative of the channel error. Analysis of the syndrome is performed to determine the actual error, which is utilized to derive the actual source data.

US Patent:

7451385, Nov 11, 2008

Filed:

Mar 24, 2005

Appl. No.:

11/088592

Inventors:

Jaehong Kim - Seoul, KR
Steven McLaughlin - Decatur GA, US
Seung-Bum Suh - Seoul, KR

Assignee:

Samsung Electronics Co., Ltd.
Georgia Tech Research Corporation - Atlanta GA

International Classification:

G06F 11/00

US Classification:

714800, 714758

Abstract:

A channel encoding apparatus and method are provided in which part of the parity bits are set to erroneous bits, and full parity bits are created by correcting the erroneous bits using a channel decoding apparatus of a receiver in a communication system. In the channel encoding apparatus, in order to generate a coded bit stream by adding a parity bit stream to a message bit stream, a partial parity generator generates a partial parity bit stream as a part of the parity bit stream using the message bit stream, an erasure generator generates a bit stream having an erroneous value as the remaining part of the parity bit stream, and a decoder calculates the value of the parity bit stream by correcting the bit stream having the erroneous value using a parity-check matrix that determines the parity bit stream, the message bit stream, and the partial parity bit stream.

US Patent:

7657824, Feb 2, 2010

Filed:

Oct 27, 2005

Appl. No.:

11/260657

Inventors:

Steven W. McLaughlin - Decatur GA, US
Jaehong Kim - Seoul, KR
Seung-Bum Suh - Seoul, KR

Assignee:

Samsung Electronics Co., Ltd.
Georgia Tech Research Corporation - Atlanta GA

International Classification:

H03M 13/03

US Classification:

714790, 714752, 714798

Abstract:

A method for puncturing a low density parity check (LDPC) code that is decoded through a parity check matrix expressed by a factor graph including check nodes and bit nodes connected to the check nodes through edges. The method includes classifying the bit nodes mapped to a parity part of a codeword into hierarchical groups according to their decoding facilities when the bit nodes are punctured, determining puncturing order of the groups, and sequentially performing puncturing on the bit nodes from a bit node belonging to a corresponding group according to the puncturing order of the groups to acquire a codeword with a desired coding rate.

US Patent:

7818650, Oct 19, 2010

Filed:

Oct 1, 2008

Appl. No.:

12/242954

Inventors:

Jaehong Kim - Seoul, KR
Steven McLaughlin - Decatur GA, US
Seung-Bum Suh - Seoul, KR

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si
Georgia Tech Research Corporation - Atlanta GA

International Classification:

H03M 13/00

US Classification:

714758, 714752

Abstract:

A channel encoding apparatus and method are provided in which part of the parity bits are set to erroneous bits, and full parity bits are created by correcting the erroneous bits using a channel decoding apparatus of a receiver in a communication system. In the channel encoding apparatus, in order to generate a coded bit stream by adding a parity bit stream to a message bit stream, a partial parity generator generates a partial parity bit stream as a part of the parity bit stream using the message bit stream, an erasure generator generates a bit stream having an erroneous value as the remaining part of the parity bit stream, and a decoder calculates the value of the parity bit stream by correcting the bit stream having the erroneous value using a parity-check matrix that determines the parity bit stream, the message bit stream, and the partial parity bit stream.

US Patent:

8145972, Mar 27, 2012

Filed:

Apr 7, 2008

Appl. No.:

12/098765

Inventors:

Dong-Ho Kim - Seoul, KR
Jaehong Kim - Seoul, KR
Myeon-Kyun Cho - Seongnam-si, KR
Steven W. McLaughlin - Atlanta GA, US

Assignee:

Samsung Electronics Co., Ltd
Georgia Tech Research Corporation - Atlanta GA

International Classification:

G06F 11/00

US Classification:

714752

Abstract:

Disclosed is a method and apparatus for coding in a communication system. The coding method includes generating an information codeword vector from an information vector, generating a first vector in the information vector from an information part of a parity check matrix, generating a first parity codeword vector by performing an exclusive OR operation of the first vector and a second vector corresponding to a cyclically shifted version of the first vector, and generating a second parity codeword vector by performing an exclusive OR operation of the first vector, the first parity codeword vector, and a third vector. The third vector is a cyclically shifted version of a vector resulting from the exclusive OR operation of the first vector, the first parity codeword vector, and a fed-back third vector.