Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-05-27
1999-11-30
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375265, 375206, 375341, 371 431, 371 434, 371 436, 371 437, 371 438, 370335, 370342, 370479, H04L 2302, H04L 512, H04L 2722, H03D 100
Patent
active
059955503
ABSTRACT:
The present invention is a method and apparatus for decoding a coded signal in a communication system. The coded signal is processed through digital signal processing to produce decision metrics representing the coded signal, and the metrics are scaled according to a soft-limiting function before being received by a decoder for decoding the coded signal. The soft-limiting function is a piecewise linear function, a piecewise nonlinear function, or a combination of piecewise linear and nonlinear functions. The soft-limiting, in the alternative, is performed on a result of a weighting function performed, in parallel of the decision metrics, on the coded signal. The result of the soft-limiting is then multiplied with a result of the decision metrics prior to the decoder. The decoder may a Viterbi decoder while the communication system may be a Code Division Multiple Access (CDMA) communication system.
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Ling Fuyun
Xu Hua
Beladi Sayed Hossain
Chin Stephen
Maddox Michael W.
Motorola Inc.
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