Excavating
Patent
1993-05-28
1996-04-23
Baker, Stephen M.
Excavating
341 57, 341 59, 341 68, 371 30, H03M 514, H03M 518, H03M 746, H03M 1300
Patent
active
055110800
ABSTRACT:
In a Viterbi decoding method, there are four playback states which are state S0, state S1, state S2, and state S3. When the signal e(t) that violates the predetermined state transition rules is inputted, bit error correction is performed by detecting the incorrect state and determined the original state. According to the predetermined state transition rules, for example, when the signal e(t) of "-1" is inputted during state S0, it makes a transition to state S0 and the value of the output signal f(t) is made "0".
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G. Ungerboeck, Channel Coding with Multilevel/Phase Signals, IEEE Transactions on Information Theory, vol. IT-28, Jan. 1983.
S. Aikawa, et al., Design Schemes for a High-Speed/Multi-Level Trellis Coded Modulation Viterbi Decoder, Journal of the Electronic Information Communication Society, vol. J73-A, No. 2, Feb. 1990.
S. Aikawa, et al., 150 KGate General-Purpose High-Coding-Gain TCM VLSIs for High-Speed Multi-Level QAM Systems, IEEE GLOBECOM '90, vol. 3, 1990.
Araki Shigeru
Itoi Satoshi
Baker Stephen M.
NEC Corporation
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