Viterbi decoder for decoding error-correcting encoded informatio

Details Viterbi decoder for decoding error-correcting encoded informatio Viterbi decoder for decoding error-correcting encoded informatio

1993-05-20

1996-03-26

Envall, Jr., Roy N.

Excavating

G06F 1110, H03M 1312

Patent

active

055027369

ABSTRACT:
A Viterbi decoder includes a first inverse mapping circuit, first to fourth branch metric generators, first to eighth accumulator switch circuits (ACS circuits) with one ACS circuit corresponding to one of the eight states of the feedback-type convolutional encoder, a path memory, and a re-encoder for the purpose of decoding an influential bit and a redundant bit of 4-bit error-correcting encoded information symbol string from I-channel data and Q-channel data. A Viterbi decoder also includes first and second shift registers having a number of levels determined according to the delay in the re-encoder and the delay in the path memory and a second inverse mapping circuit for the purpose of decoding noncoding bits of 4-bit error-correcting encoded information symbol string using the I-channel data and the Q-channel data.

REFERENCES:
patent: 5150369 (1992-09-01), Costa et al.
Aikawa, Satoru, et al., Journal of the Electronic Information Communication Society, "Design Schemes for a High-Speed/Multilevel Trellis Coded Modulation Viterbi Decoder", vol. J73-A, No. 2, (Feb., 1990), pp. 331-340.
Aikawa, Satoru, et al., IEEE Globecom '90, "150 KGate General-Purpose High-Coding-Gain TCM VLSIs for High-Speed Multi-Level QAM Systems", vol. 3 (1990), pp. 1963-1967.
Ungerboeck, Gottfried, IEEE Transactions on Information Theory, "Channel Coding with Multilevel/Phase Signals", vol. IT-28 (Jan., 1982), pp. 55-67.
Aikawa, Satoru, et al., Journal of the Electronic Information Communication Society, "Design Schemes for a High-Speed/Multilevel Trellis Coded Modulation Viterbi Decoder", vol. J73-A, No. 2, (Feb., 1990), pp. 331-340.
Aikawa, Satoru, et al., IEEE Globecom '90, "150 KGate General-Purpose High-Coding-Gain TCM VLSIs for High-Speed Multi-Level QAM Systems", vol. 3 (1990), pp. 1963-1967.
Ungerboeck, Gottfried, IEEE Transactions on Information Theory, "Channel Coding with Multilevel/Phase Signals", vol. IT-28 (Jan., 1982), pp. 55-67.

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