Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1993-10-29

1996-03-12

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 375200, 375205, H04B 1707, H04B 169

Patent

active

054992672

ABSTRACT:
A spread spectrum communication system includes a receiving section which receives a signal produced by modulating a carrier of a predetermined frequency with a spread spectrum signal which has been modulated with a spread code of a clock frequency fC and mixes the received signal with a local oscillation signal to provide a spread spectrum signal component wherein a local oscillation frequency fL of said local oscillation signal is set at fL.apprxeq.fC+fo or fL>fC+fo or fL.apprxeq.fo-fC or fL<fo-fC where fo represents frequency of said received signal. The received signal may be a signal which has been converted to an intermediate frequency signal after being received by the receiving section. The spread spectrum communication system can prevent a spread spectrum signal from being impaired due to variation in a transmission frequency or oscillation frequency in a receiving section and can thereby accurately demodulate the received signal.

REFERENCES:
patent: 3475558 (1969-10-01), Cahn
patent: 4736390 (1988-04-01), Ward et al.
patent: 4962508 (1990-10-01), Kingston

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