Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1996-08-16
1999-10-19
Baker, Stephen M.
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
714751, 714755, 714780, H03M 1300, H04L 116
Patent
active
059681985
ABSTRACT:
A coding system is disclosed wherein the receive side includes a decoder capable of producing, in addition to the hard information decoded output, either or both symbol and/or bit soft information values. For a certain information bit position, a value proportional to the joint probability that a received symbol and the set of all hypothesized transmitted codewords that led to the estimated or detected hard information output is calculated. The calculated probabilities with respect to plural codewords having a zero in that certain information bit position are compared to the calculated probabilities with respect to the plural codewords having a one in that certain information bit position. The result of the comparison provides an indication of whether the hard information output in that same information bit position is more likely a one or a zero. The output soft information values are further processed in comparison to a preset threshold, with instances exceeding the threshold triggering block rejections and/or retransmissions.
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Balachandran Kumar
Hassan Amer A.
Khayrallah Ali S.
Ramesh Rajaram
Wang Yi-Pin Eric
Baker Stephen M.
Ericsson Inc.
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