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High frequency multichannel diversity differential phase shift (DPSK) communications system

  • US 5,422,913 A
  • Filed: 01/11/1993
  • Issued: 06/06/1995
  • Est. Priority Date: 05/11/1990
  • Status: Expired due to Fees
First Claim
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1. A high frequency multichannel communications system having at least a transmitter and a receiver:

  • said transmitter comprising;

    a) input means for receiving digital signal data for transmission of transmitted data bits;

    b) the input means, connected to a plurality of separate diversity frequency channels distributed over a broad spectral region of a high frequency band, each channel including a differential phase shift key (DPSK) modulator, for modulating a channel frequency by successive bits of the digital signal data at a low data rate to produce a DPSK channel signal; and

    c) means for combining the DPSK channel signals from each of the plurality of separate diversity frequency channels for transmission; and

    wherein said receiver comprising;

    a) receiver means for receiving and demodulating the transmitted signals to form baseband signals;

    b) said baseband signals from the receiver means being connected to a plurality of narrowband receiver frequency channels, each receiver frequency channel including a DPSK detector responsive to a respective one of the transmitted DPSK channel frequency signals;

    c) means for identifying any of said receiver frequency channels corrupted by noise; and

    d) semi-coherent processing means, responsive to each transmitted data bit, for vectorially adding DPSK detector output signals, excluding said channels corrupted by noise and for producing a resultant vector signal phase for determining polarity of each transmitted data bit as a data output signal.

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