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Digital communication system

  • US 4,849,990 A
  • Filed: 02/04/1987
  • Issued: 07/18/1989
  • Est. Priority Date: 06/05/1985
  • Status: Expired due to Term
First Claim
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1. A digital communication system for transmitting to a receiving side digital signals comprising first and second predetermined information symbols digitized in a predetermined time slot generated from a signal source, comprising:

  • two signal transmission paths each having substantially different transmission time intervals between said signal source and an output of said receiving side,delay means inserted into at least one of said signal transmission paths for setting the delay time of information signals being transmitted via said two signal transmission paths at a predetermined fraction of said time slot,modulation means responsive to said digital signals for generating said information symbols by shifting carrier wave signal phases continuously twice by Δ

    θ

    /2 per 1/2 time slot with respect to first information symbols and continuously twice by -Δ

    θ

    /2 per 1/2 time slot with respect to second information symbols, anddemodulation means for combining said information signals received via said two signal transmission paths and for demodulating the original digital signal by delay detection,whereby a bit error rate of said system is brought near a minimum relative to said predetermined time slot.

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