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Coherent phase shift keyed demodulator for power line communication systems

  • US 4,311,964 A
  • Filed: 09/21/1979
  • Issued: 01/19/1982
  • Est. Priority Date: 09/21/1979
  • Status: Expired due to Term
First Claim
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1. A demodulator for data bit signals modulating rectangular pulse signals derived from a binary phase shift keyed carrier, comprising:

  • means sampling said rectangular pulses and producing polarity sample bits having either of two binary logic states corresponding to first and second levels of said rectangular pulse signals with predetermined equal groups of said sample bits cyclically occurring during each data bit interval;

    means responsive to said predetermined equal groups of the sample bits for producing first vector component signals having a relative phase angle representation at a fundamental frequency for each separate one of said predetermined equal groups of the sample bits;

    means responsive to a plurality of said predetermined groups of the sample bits for producing reference vector component signals having a relative phase angle representation at said fundamental frequency;

    phase detector means producing correlation signals in response to phase comparisons of each of said first vector component signals and said reference vector component signals; and

    means selectively summing said correlation signals when produced in response to phase comparisons of said first vector component signals produced from said separate ones of said predetermined equal groups of the sample bits occurring during the same data bit intervals.

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