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Frequency-hopped single sideband mobile radio system

  • US 4,479,226 A
  • Filed: 03/29/1982
  • Issued: 10/23/1984
  • Est. Priority Date: 03/29/1982
  • Status: Expired due to Term
First Claim
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1. In a system for communicating a message signal (s(t))a transmitter (10) responsive to said message signal for producing as an output a carrier-frequency-hopped single sideband signal (s'"'"'hop (t)), wherein said transmitter comprisescarrier-frequency-hopping generating means (16) for generating as an output a unique sequence of separate carrier frequencies (fi (t)) from a plurality of N possible carrier frequencies (F1,F2, . . . ,FN);

  • multiplying means (12, 14,

         18) responsive to both said message signal and said unique sequence of carrier frequencies for multiplying said message signal with said unique sequence of carrier frequencies and producing as an output of said transmitter the carrier-frequency-hopped single sideband signal; and

    a receiver (20) responsive to said carrier-frequency-hopped single sideband signal produced by said transmitter and receiving therefrom said message signal, wherein said receiver comprisescarrier-frequency-hopping generating means (24) for generating as an output said unique sequence of separate carrier frequencies generated by said transmitter carrier-frequency-hopping generating means, said receiver carrier-frequency-hopping generating means also capable of producing as an output an assignment code (c(t)) associated with said unique sequence of carrier frequencies wherein said transmitter carrier-frequency-hopping generating means is responsive to said assignment code generated by said receiver carrier-frequency-hopping generating means for producing as an output said unique sequence of carrier frequencies related thereto; and

    demodulating means (22, 26,

         28) responsive to both the received carrier-frequency-hopped single sideband signal (s'"'"'hop (t)) and said unique sequence of separate carrier frequencies for demodulating said received carrier-frequency-hopped single sideband signal in accordance with said unique sequence of separate carrier frequencies and producing as an output of said receiver the message signal applied as an input of said transmitter.

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