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Method and apparatus for communication in an environment having repetitive noise

  • US 20020168031A1
  • Filed: 05/13/2002
  • Published: 11/14/2002
  • Est. Priority Date: 05/14/2001
  • Status: Abandoned Application
First Claim
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1. A method of communication in an environment having repetitive noise, said method comprising the steps of:

  • (a) in a receiver, de-modulating an incoming signal containing signal bits by taking digital samples of the incoming signal so as to demodulate the incoming signal into separate x and y channels, said x and y channels approximating respectively, a co-sine and sine wave, (b) summing consecutive groups of said samples from said x and y channels so as to determine corresponding x and y channel points, wherein each group of said consecutive groups contains substantially the same number of said samples, (c) within said receiver, defining at least first and second demi-bits wherein each demi-bit of said first and second demi-bits is of the same length and wherein said first and second demi-bits together, or integer multiples of said first and second demi-bits together, are the same length as one signal bit of said signal bits, (d) using said x and y channel points within said demi-bits to calculate an average phase and an average magnitude over each said demi-bit;

    (i) so as to produce a first bit channel of said y channel points when averaged over said first demi-bits, and a first channel of said x channel points when averaged over said first demi-bits, (ii) and so as to produce a second bit channel of said y channel points when averaged over said second demi-bits, and a second channel of said x channel points when averaged over said second demi-bits, (e) determining the resulting phase and magnitudes of said first demi-bits of said first bit channel and the resulting phase and magnitudes of said second demibits of said second bit channel, (f) comparing the magnitudes of said first and second bit channels and choosing the bit channel having the largest overall magnitude as the bit channel from which data is to be read, (g) reading data from said bit channel from which data is to be read by determining phase angles in that bit channel, wherein said phase angles indicate corresponding phase-shift keyed data bits as determined by rejecting phase angles which fall into phase-shift angle fail regions interposed between ranges of acceptable phase-shift angles, and wherein the signal bit rate of the incoming signal is adapted to be an integer multiple of the half-wave frequency of the alternating current wave form, and wherein a signal processor of said receiver does not, when processing the incoming signal, synchronize to and track the alternating current voltage wave form or any part of the incoming signal.

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