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Maximum-likelihood decoding method and device

  • US 5,432,820 A
  • Filed: 07/26/1993
  • Issued: 07/11/1995
  • Est. Priority Date: 11/19/1990
  • Status: Expired due to Term
First Claim
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1. A maximum-likelihood decoding method for decoding an input signal subject to intersymbol interference, comprising the steps of:

  • (a) assuming a measure of interference caused by a future signal, that is later in time sequence than an assumed data sequence, on the basis of predetermined bits of sample values of said input signal that is earlier in time sequence than the assumed data sequence stored in an assumed path memory;

    (b) obtaining a sample value of said input signal by referring to the measure of interference; and

    (c) generating a plurality of survivor paths by conducting maximum-likelihood decoding on said input signal, employing an assumed sample value and said obtained sample value of said input signal and, thereafter, storing the generated survivor paths in a path memory and outputting data of the most likely survivor path as a decoded data sequence.

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