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Timing synchronization in a receiver employing orthogonal frequency division multiplexing

  • US 5,953,311 A
  • Filed: 02/18/1997
  • Issued: 09/14/1999
  • Est. Priority Date: 02/18/1997
  • Status: Expired due to Term
First Claim
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1. A method of determining the boundaries of symbols in a stream of data being transmitted through a channel and having a symbol period Ts, wherein the symbols comprise an active interval and a guard interval, said guard interval being a replication of a portion of said active interval, the method comprising the steps of:

  • sampling first portions of said stream, wherein said first portions are separated by said active interval to form a first comparison block of data;

    measuring a first dispersion of said first comparison block;

    sampling second portions of said stream, wherein said second portions are separated by said active interval to form a second comparison block of data;

    measuring a second dispersion of said second comparison block; and

    calculating a statistic of said first dispersion and said second dispersion; and

    synchronizing said stream based on said statistic, for signal reconstruction by a fast Fourier transform.

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