×

Spread spectrum communication system

  • US 4,943,976 A
  • Filed: 09/13/1989
  • Issued: 07/24/1990
  • Est. Priority Date: 09/16/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. A transmitter of a spread spectrum communication system, comprising:

  • means for modulating a first carrier with an information signal to generate a primary modulation signal;

    means for adding the primary modulation signal and a second carrier to generate an addition signal;

    means for generating a first spread code and a second spread code in response to a clock signal, the second spread code being equal to the first spread code delayed by a predetermined time;

    means for multiplying the addition signal and the first spread code to spread a spectrum of the addition signal with the first spread code to generate a first spread spectrum signal;

    means for shifting a phase of the first carrier by a predetermined angle to generate a third carrier;

    means for multiplying the third carrier and the second spread code to spread a spectrum of the third carrier with the second spread code to generate a second spread spectrum signal; and

    means for adding the first spread spectrum signal and the second spread spectrum signal to generate a composite spread spectrum signal.

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