Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1993-02-04

1994-04-05

Barron, Jr., Gilberto

Pulse or digital communications

Repeaters

Testing

H04B 7216

Patent

active

053012062

ABSTRACT:
A spread spectrum communication system comprising a transmitter including an angle modulator, a frequency divider, a spread code generator, and a spread spectrum modulator, and a receiver including a despreading circuit, an angle demodulator, a sync detection circuit, and a clock signal generating circuit. In the transmitter, the spread code generator produces a spread code having correlation with the angle-modulated signal outputted from the angle modulator. In the receiver the despreading circuit despreads the spread spectrum modulation signal sent from the transmitter by a demodulation spread code. The angle demodulator generates a demodulation output by means of a phase-locked loop circuit contained therein. The sync detection circuit detects sync condition on the basis of noise level of a phase detector provided in the phase-locked loop circuit, and generates a sync detection signal when sync condition is established. And, the clock signal generating circuit responds the sync detection signal to switch a demodulation clock from a temporary clock used for capturing a sync time to a regular clock which is equivalent to a modulation clock signal used in the transmitter.

REFERENCES:
patent: 4255810 (1981-03-01), Soloman et al.
patent: 5073898 (1991-12-01), Endo et al.
patent: 5121407 (1992-06-01), Partyka et al.
patent: 5140610 (1992-08-01), Holliday et al.
patent: 5222075 (1993-06-01), Richley
"Latest Spread Spectrum Communication Systems" by R. C. Dixon; Jatekku publisher; pp. 123 and 124 (w/ partial English translation).

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