Multistage decoder

Details Multistage decoder Multistage decoder

1992-03-27

1994-06-21

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 17, 371 371, H04L 2718

Patent

active

053234243

ABSTRACT:
A multistage decoder for decoding received symbols formed by symbols which have been subjected to multilevel coding in several successive partitioning levels from a constellation into several subsets. A symbol of the constellation is coded into several bits, and each stage of the multistage decoder determines a sequence of bits relative to a partitioning level for a sequence of estimated symbols which are selected from among the symbols of the constellation or of the subset as being each individually closest to the received symbols. The invention is characterized in that for at least one stage at least one detector generates an erasure bit for the estimated symbols whenever a received symbol lies in a predetermined erasure zone, whereupon the stage decoder then corrects the erasure bits. The decoder may operate in the adaptive or non-adaptive mode. The erasure zones may be angular sectors or bands of constant width. The widths of the zones are stored in preprogrammed memories.

REFERENCES:
patent: 4283682 (1981-08-01), Sifford et al.
patent: 4928288 (1980-03-01), D'Aria et al.
"Multilevel Codes Based on Partitioning", IEEE Transactions on Information Theory, vol. 35, No. 1, Jan. 1989, pp. 87-98.
"Channel Coding with Multilevel/Phase Signals", IEEE Transactions on Information Theory, vol. IT-28, No. 1, Jan. 1982, pp. 55-67.

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