Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1996-08-07

1999-09-28

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375209, 375296, H04B 1500

Patent

active

059600284

ABSTRACT:
A transmitter of a spread spectrum communication system includes a data generating portion, a differential coding portion, an S/P converting portion, multipliers, PN generator, a local signal generator, modulators, delay elements, combiner, a frequency converting portion, a power amplifying portion and a transmission antenna. Parallel signals are multiplied by a spread code from the PN generator, and the results are delayed by delay elements and multiplexed. Time difference between the delay times are set to an arbitrarily time period of at least 1 chip from each other. Therefore, error rate characteristics can be improved, and degradation of correlated output is suppressed, whereby difficulty in demodulation can be avoided.

REFERENCES:
patent: 5237586 (1993-08-01), Bottomley
patent: 5493588 (1996-02-01), Lennen
patent: 5559828 (1996-09-01), Armstrong et al.
patent: 5602833 (1997-02-01), Zehavi
patent: 5629956 (1997-05-01), Durrant et al.
patent: 5680414 (1997-10-01), Durrant et al.
patent: 5715236 (1998-02-01), Gilhousen et al.
patent: 5745839 (1998-04-01), Lieberman
"Spread Spectrum Communication System", by Mitsuo Yokoyama, Kagaku-Gijutsu Shuppansha, pp. 528-538.

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