Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1993-11-09
1995-05-09
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 43, H03D 100, H04L 2706
Patent
active
054147387
ABSTRACT:
There is described an apparatus and method for decoding signals produced by a communication system employing cascading or concatenation of error control codes that contain, for example, short memory convolution codes. A novel inner decoder and method is described which is a modified Viterbi decoder that generates soft decisions by using a subset of the operations performed by a normal, hard decision, Viterbi decoder. Results of simulation tests show that the performance of the novel decoder provides a bit error rate performance that matches the theoretical bit error rate for the various signal to noise ratios, which performance is better than decoders previously available. Several implementations are described and compared.
REFERENCES:
patent: 4677625 (1987-06-01), Betts et al.
patent: 5128967 (1992-07-01), Durkin et al.
patent: 5233629 (1993-08-01), Paik et al.
Joachim Hagenauer, "Soft-In/Soft-Out the Benefits of Using Soft Values in all Stages of Digital Receivers", presented at the Third International Workshop on Digital Signal Processing Techniques Applied to Space Communications, organized by the European Space Agency in cooperation with Eutelsat and Inmarsat in Estec, Noordwijk, The Netherlands, 23-25 Sep. No year is noted on the available copy of this document. A Dialog search (copy attached) indicates that the conference occurred on those dates in 1992, but no publication date was found. It is not presently known whether publication of the above-noted article occurred at or after the workshop.
Bocure Tesfaldet
Chin Stephen
Handy Robert M.
Motorola Inc.
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