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Variable rate communication method and a variable rate communication system

  • US 5,627,845 A
  • Filed: 07/07/1994
  • Issued: 05/06/1997
  • Est. Priority Date: 07/16/1993
  • Status: Expired due to Fees
First Claim
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1. A variable rate communication method in which a transmitter transmits frames of transmission data and a receiver receives said transmission data, comprising the steps of:

  • in said transmitter,performing convolution coding of the information data for error correction, an information rate of said information data in each frame being represented by any one of B, B/2, B/22, --B/2n, where B is a maximum information rate of said information data and n is 0 or a positive integer; and

    generating said transmission data by repeating said convolution coded information data in each frame (2n -1) times when the information rate of said information data is B/2n, the number of times that said convolution coded information data is repeated in a given frame being a repetition number for that frame;

    and, in said receiver,determining the information rate of said information data from said received transmission data by finding the repetition number of said convolution coded information data, for every frame; and

    after the information rate of said information data has been detected, performing Viterbi decoding of said received transmission data based on the detected information rate of said information data, for every frame.

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