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Data transmission method, data transmission system, and cellular radio system

  • US 6,092,222 A
  • Filed: 08/13/1996
  • Issued: 07/18/2000
  • Est. Priority Date: 12/19/1994
  • Status: Expired due to Term
First Claim
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1. A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, the method comprising:

  • speech coding a signal transmitted on at least one channel having a lower capacity according to a channel of a higher capacity;

    performing channel coding on the speech coded data in such a manner that the obtained number of symbols corresponds to the channel of the lower capacity;

    dividing the speech signal block into three parts which comprise 73, 22 and 17 symbols, respectively;

    adding three error correction symbols to the 22-symbol part;

    combining the first two parts and adding five know tail symbols thereto;

    convolution coding the 103 symbols obtained in this manner with and an efficiency ratio of 1/4;

    adding five known tail symbols to the posterior 17-symbol part; and

    convolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2,wherein the speech coded data is a data block of 112 symbols.

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