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Technique for achieving the theoretical coding gain of digital signals incorporating error correction

  • US 4,995,057 A
  • Filed: 01/30/1989
  • Issued: 02/19/1991
  • Est. Priority Date: 11/02/1988
  • Status: Expired due to Term
First Claim
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1. A point-to-point communications system which transmits digital signals from a first location to only one second location via a communications medium having varying transmission characteristics, said system comprisinga first adjustable equalizer at said first location for compensating for amplitude and phase distortion in said medium,a second adjustable equalizer at said second location for compensating for amplitude and phase distortion in said medium,means, responsive to digital signals received at said second location, for generating equalization coefficients for said second equalizer which are suitable for compensating for said amplitude and phase distortion, and for transmitting said generated equalization coefficients from said second location to said first equalizera first Nyquist filter at said first location,a second Nyquist filter at said second location, andcontrol means for assuring that only one of said first and second equalizers and only one of said first and second Nyquist filters is operative at any time.

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