Differential coding and carrier recovery for multicarrier systems

CAFC
  • US 6,931,084 B1
  • Filed: 04/14/1998
  • Issued: 08/16/2005
  • Est. Priority Date: 04/14/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of performing an echo phase offset correction in a multi-carrier demodulation system, comprising the steps of:

  • differential phase decoding phase shifts based on a phase difference between simultaneous carriers having different frequencies;

    determining an echo phase offset for each decoded phase shift by eliminating phase shift uncertainties related to the transmitted information from said decoded phase shift;

    averaging said echo phase offsets in order to generate an averaged offset;

    correcting each decoded phase shift based on said averaged offset; and

    further comprising a step of comparing an absolute value of a symbol associated with a respective decoded phase shift with a threshold, wherein only phase shifts having associated therewith symbols having an absolute value exceeding said threshold are used in said step of averaging said echo phase offsets.

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