Spread spectrum communications system for high-speed communications
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Apr 30, 1997
filing date -
Apr 30, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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