Spread spectrum communications system for high-speed communicati

Details Spread spectrum communications system for high-speed communicati Spread spectrum communications system for high-speed communicati

1997-04-30

1999-07-27

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375206, 370342, H04B 1500, H04B 7216

Patent

active

059302909

ABSTRACT:
A fast spread spectrum communication system is provided, having fewer circuits and requiring fewer PN codes to be assigned to a user. A series of digital data to be transmitted, is divided into 4-bit frames. The 4-bit data of each frame is divided into the first through fourth elements in a predetermined order. The first complex number is constructed by the first and second elements, and the second complex number is determined according to the value of the third and fourth elements. The spectrum of the data to be transmitted is spread by multiplying these complex numbers. Four matched filters despread a received signal by different combinations of PN codes stored in a receiver. The first through fourth elements are recovered according to the outputs of the matched filters.

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"Proposal of Parallel combinary spread spectrum Communication system", B-II vol. J74-B-II No. 5 pp. 207-214 May 1991 J. Zhu et al.
CDMA Principles of Spread Spectrum Communication AJ. Viterbi pp. 97-105.

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