Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-05-24
1998-12-01
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 436, 371 437, G06F 1100, H03M 1300
Patent
active
058449469
ABSTRACT:
A receiver for soft decision and decoding for deriving an appropriate soft-decision value so as to reduce the error rate at the output of a decoder such as a Viterbi decoder. A length V of transmission sequences that can be generated is set greater than a memory length L of a channel (V>L). By providing as many as 2N (N=2.sup.V) branch metric producing circuits and as many as N add/compare/select apparatus (ACS apparatus) for respective states corresponding to combinations of transmission sequence data of V, the accuracy of a soft-decision value is enhanced. Further, a soft-decision value producing circuit performs a process not based on path metrics but based on survivor metrics. This allows a digital signal processor to easily perform the process.
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Chin Stephen
Gluck Jeffrey W.
Mitsubishi Denki & Kabushiki Kaisha
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