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Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system

  • US 6,289,037 B1
  • Filed: 02/24/1997
  • Issued: 09/11/2001
  • Est. Priority Date: 02/24/1997
  • Status: Expired due to Term
First Claim
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1. A highly bandwidth-efficient communications method, comprising the steps of:

  • receiving at a base station a wireless spread signal comprising an incoming data message including a data block and a block number in a first channel at a first time spread over a plurality of discrete traffic frequencies;

    adaptively despreading the data message received at the base station by using despreading weights;

    receiving at said base station a wireless spread signal comprising an incoming error detection message including said block number and a first error detection code derived from said data block in a second channel at a second time spread over a plurality of wireless link control frequencies;

    adaptively despreading the error detection message received at the base station by using said despreading weights;

    computing a second error detection code for said received data block;

    selecting said first error detection code using said block number received in said data message;

    comparing the first error detection code with said second error detection code;

    generating an error response signal at the base station in response to said first error detection code being different from said second error detection code.

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