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Method and apparatus for decoding a phase encoded data signal

  • US 6,246,729 B1
  • Filed: 09/08/1998
  • Issued: 06/12/2001
  • Est. Priority Date: 09/08/1998
  • Status: Expired due to Term
First Claim
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1. A method for decoding a phase encoded data signal, the method comprising the steps of:

  • a) windowing the data signal to reduce sidelobes in a frequency spectrum of the data signal so as to mitigate interference with other signals;

    b) transforming the windowed data signal into real and imaginary frequency components thereof;

    c) converting the real and imaginary frequency components of the data signal into phase and magnitude information with respect thereto;

    d) summing a plurality of frequencies which substantially comprise noise to provide a magnitude of a noise floor;

    e) comparing the magnitude of the data signal to the magnitude of the noise floor so as to provide a signal-to-noise ratio;

    f) comparing the signal-to-noise ratio to a threshold value and facilitating further processing of the signal when the signal-to-noise ratio exceeds the threshold value;

    g) identifying a maximum magnitude of the data signal;

    h) calculating a phase correction and adding the phase correction to the data signal;

    i) differentially demodulating the data signal;

    j) multiplying the demodulated data signal with a correlation sequence to form a product signal; and

    k) hard limiting the product signal and converting the product signal to a binary number.

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