Apparatus and method for communicating digital data using trelli

Details Apparatus and method for communicating digital data using trelli Apparatus and method for communicating digital data using trelli

1992-07-13

1995-04-18

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 43, H03D 100, H04L 2706, G06F 1110, H03M 1312

Patent

active

054085020

ABSTRACT:
Digital data is communicated using trellis coded QAM. Symbols are coded for transmission using a rate 1/2 convolutional encoder punctured to rate 2/3. The coded symbols are transmitted for receipt at a receiver. At the receiver, two sets of branch metrics are computed for each received symbol. The received symbols are decoded by using the branch metrics to effect two passes through a modified rate 1/2 Viterbi decoder for each symbol.

REFERENCES:
patent: 5113401 (1992-05-01), Chevillat et al.
patent: 5233629 (1993-08-01), Paik et al.
J. Cain et al., "Punctured Convolutional Codes of Rate (n-1)
and Simplified Maximum Likelihood Decoding", IEEE Trans. Info. Theory, vol. IT-25, pp. 97-100, Jan. 1979.
Y. Yasuda et al., "High-Rate Punctured Convolutional Codes for Soft Decision Viterbi Decoding", IEEE Trans. on Comm., vol. COM-32, pp. 315-319, Mar. 1984.

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