Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1989-05-31

1990-05-29

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

380 9, 380 49, H04K 100

Patent

active

049301390

ABSTRACT:
The spread spectrum digital communication system includes data input devices for generating digital information signals to be transmitted using radio signals. A chip stream generator converts the data bits into chip streams that are either complemented or not complemented via an exclusive-OR gate, depending on the data bits. A scrambler further randomizes the chip stream for transmission. The receiver includes a descrambler and a correlator or digital matched filter for detecting the data signal. A modified receiver includes a sampler for sampling the scrambled signal at a rate which is the multiple of the chip rate thereby eliminating any need for recovering the chip clock. Another modified version includes a receiver having means for generating multi-level signals indicating the quality of the probable detection.

REFERENCES:
patent: 4418393 (1983-04-01), Zscheile, Jr.
patent: 4431865 (1984-02-01), Bernede et al.
patent: 4447672 (1984-03-01), Nakamura
patent: 4659549 (1987-03-01), Halpern et al.
patent: 4862478 (1989-08-01), McIntosh
patent: 4862479 (1989-08-01), Hamatsu
patent: 4866735 (1989-09-01), Mori et al.

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