Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1995-11-27
1998-05-26
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 43, H04L 2706, H03M 1312
Patent
active
057578630
ABSTRACT:
A GA HDTV decoding system recovers a data symbol including a first bit and (N-1) remaining bits from a transmitted signal, wherein the first bit of the data symbol is coded by a 1/2 convolutional encoder to provide two coded bits and a modulated signal corresponding to the data symbol is selected among 2.sup.N+1 predetermined signals, amplitude of each of the predetermined signals corresponds to one of 2.sup.N+1 combinations of the remaining (N-1) bits of the data symbol and the two coded bits, and the modulated signal is transmitted by a channel to form a transmitted signal. The decoding system comprises means for deciding the (N-1) remaining bits of the data symbol in response to the transmitted signal; means for providing two bit metrics in response to the transmitted signal wherein each of the bit metric is a number reflecting a confidence level that each of the coded bits is "1"; and means for determining the first bit of the data symbol from the two bit metrics.
REFERENCES:
patent: 5233629 (1993-08-01), Paik et al.
Bernard Sklar, "Digital Communications Fundamentals and Applications," Prentice Hall, pp. 167-182,260263 &329-342, 1988.
Bocure Tesfaldet
Daewoo Electronics Co. Ltd.
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