Receiver for spread spectrum communication and receiving method

Details Receiver for spread spectrum communication and receiving method Receiver for spread spectrum communication and receiving method

1987-09-30

1990-02-20

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04K 100, H04L 900

Patent

active

049032798

ABSTRACT:
The present invention discloses a receiver and a receiving method for spread spectrum communication for use in the digital communication system. The receiver basically comprises a receiving circuit, a spread signal distributing circuit, a pseudo noise signal generating circuit, an activating circuit, correlation detecting circuits, an initial seizing control circuit, a synchronization sustaining control circuit, a synchronization control circuit and a demodulating circuit. If a phase lock condition is broken within a short period of time, such condition is sustained until phase lock is recovered so that communication can be started again immediately after phase lock is recovered without initialization for each asynchronization. The receiving circuit is very much simplified and particularly, the Costas Loop demodulating circuit detects the phase lock condition when the signal obtained by multiplying the signal of which phase is shifted by 90.degree. and the reversely spread signal is within the preset range without using a phase shifter or other multiplying circuit. Accordingly the circuit structure of the receiver as a whole can be simplified.

REFERENCES:
patent: 4164628 (1979-08-01), Ward et al.
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4442527 (1984-04-01), Munday
patent: 4470145 (1984-09-01), Williams
patent: 4651327 (1987-03-01), Fujita
patent: 4653068 (1987-03-01), Kadin
patent: 4653069 (1987-03-01), Roeder
patent: 4689626 (1987-08-01), Hori et al.
patent: 4701934 (1987-10-01), Jasper
patent: 4763103 (1988-08-01), Galula et al.
patent: 4774715 (1988-09-01), Messenger

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