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TDMA radio system employing BPSK synchronization for QPSK signals subject to random phase variation and multipath fading

  • US 4,873,683 A
  • Filed: 12/04/1987
  • Issued: 10/10/1989
  • Est. Priority Date: 12/04/1987
  • Status: Expired due to Term
First Claim
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1. A quadrature phase shift keying (QPSK) time division multiple access (TDMA) radio system conveying a data signal comprising a synchronizing portion and a message portion in a timeslot over a radio channel which introduces multipath distortion and phase variation in the data signal, the system comprising:

  • means for transmitting a synchronizing portion consisting of a plurality of data bits in a predetermined pattern in only one vector of the data signal;

    means for receiving the data signal subjected to multipath distortion and phase variation; and

    means, responsive to said one vector synchronizing portion of a received data signal, for compensating the multipath distortion and phase variation of the message portion of said received data signal for the duration of one TDMA timeslot.

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