Excavating
Patent
1995-04-24
1998-01-20
Baker, Stephen M.
Excavating
H03M 1312
Patent
active
057107858
ABSTRACT:
Convolutional code symbols are sequentially stored into a first buffer at a transmission rate and read therefrom into a decoder where the symbols are decoded at a rate higher than the transmission rate and stored into a second buffer. A controller determines the likelihood of each decoded symbol in accordance with a predetermined likelihood algorithm and causes the decoded symbols to be read out of the second buffer in a backward direction into the decoder when the determination indicates a low likelihood value. When the first buffer is overflowed, the controller causes symbols to be read out of the first buffer into the decoder staring with a symbol which is k symbols older than the most recently received symbol and causes the decoder to shift its symbol timing by one clock interval, where k is an integer ranging from zero to a predetermined number which is smaller than the maximum number of symbols that can be stored in the first buffer.
REFERENCES:
patent: 3665396 (1972-05-01), Forney, Jr.
patent: 4539684 (1985-09-01), Kloker
patent: 4710746 (1987-12-01), Shimoda et al.
Fano, R., "A Heuristic Discussion of Probabilistic Decoding", IEEE Transactions on Information Theory, Apr. 1963, pp. 64-74.
Forney, Jr. et al., "A High-Speed Sequential Decoder: Prototype Design and Test", IEEE Transactions on Communication Tech., vol. COM-19, No. 5, Oct. 1971, pp. 821-835.
Baker Stephen M.
NEC Corporation
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