GMSK signal processors for improved communications capacity and quality

  • US 5,848,105 A
  • Filed: 10/10/1996
  • Issued: 12/08/1998
  • Est. Priority Date: 10/10/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for extracting a signal of interest from a plurality of spectrally and temporally overlapping input signals containing digital data having a bit rate, said input signals having carrier frequencies, said input signals having conjugate cycle frequencies equal to twice their carrier frequencies plus and minus one-half of their data bit rate, said input signals exhibiting conjugate spectral redundancy for spectral components having frequencies separated by said conjugate cycle frequencies, said input signals exhibiting temporal redundancy, said apparatus comprising:

  • (a) time-shifting means for producing a time-shifted output signal wherein said signal of interest is time-shifted;

    (b) frequency-shifting means for producing a frequency-shifted output signal wherein said signal of interest is frequency-shifted by an amount determined by its cycle frequencies; and

    (c) linear combining means for weighting and summing said output signals to produce an estimate of said signal of interest.

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