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Viterbi decoder with reduced number of bits in branch metric calculation processing

  • US 20010004391A1
  • Filed: 12/13/2000
  • Published: 06/21/2001
  • Est. Priority Date: 12/20/1999
  • Status: Active Grant
First Claim
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1. A method of calculating a branch metric in Viterbi decoding for deriving a branch metric by comparing a codeword produced from a convolutional code with a sign of determination data obtained from conversion of received data for branch metric calculation, said method comprising the steps of:

  • dividing said determination data into a sign and a metric and outputting them;

    determining whether said divided sign matches said codeword or not;

    selecting and outputting “

    0”

    when they match or selecting and outputting said metric when they do not match based on the determination result of the match or mismatch; and

    adding outputs selected when the signs match to outputs selected when the signs do not match to calculate a branch metric.

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