×

Spread spectrum communication system

  • US 4,760,586 A
  • Filed: 12/27/1985
  • Issued: 07/26/1988
  • Est. Priority Date: 12/29/1984
  • Status: Expired due to Fees
First Claim
Patent Images

1. A frequency hopping spread spectrum communication system comprising:

  • transmitter means for transmitting a radio frequency (RF) signal, said transmitter means having a first frequency hopping pattern generator means for generating a frequency hopping pattern and modulator means for modulating the frequency of transmission of the RF signal in accordance with said frequency hopping pattern; and

    receiver means for receiving the RF signal of the transmitter means, said receiver means having a second frequency hopping pattern generator means for generating said frequency hopping pattern, and demodulator means for demodulating the RF signal in accordance with said frequency hopping pattern;

    wherein said demodulator means comprises a phase locked loop circuit for tracking the transmitted RF signal, said second frequency hopping pattern generator means having means for generating a pattern of offset voltages in accordance with said frequency hopping pattern, and said phase locked loop circuit having a voltage controlled oscillator responsive to the offset voltage means wherein tracking breaks caused by hops in the frequency of transmission are avoided.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×