Receiver for code division multiple access communication system

Details Receiver for code division multiple access communication system Receiver for code division multiple access communication system

1997-05-29

1999-10-26

Patel, Ajit

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, 370320, 375207, H04B 7216

Patent

active

059740388

ABSTRACT:
This invention reduces electric power consumption of a CDMA communication system receiver while it is in the wait mode. A received spread spectrum signal is demodulated in multiplication means into baseband signals Ri and Rq, and inputted into a complex matched filter. This filter is intermittently driven by supply voltage control means to perform acquisition of received signals. When an electric power calculation circuit detects the output of the filter to reach a peak equal to or greater than a predetermined value, the received signals undergo acquisition by controlling n number of correlators 26-1 to 26-n to work by a correlator controlling circuit. Moreover, de-spreading is performed. The outputs from each correlator 46-1 to 26-n are given to a RAKE combiner and demodulated by the RAKE by a combining and demodulating circuit.

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Dixon, Robert C., "Spread Spectrum System With Commercial Applications", Third Edition, John Wiley & Sons, Inc., 1994, p. 237 and p. 259.
Yokoyama, Mitsuo, "Spread Spectrum Communication System", Kagaku Gijutsu Shuppansha, 1998, p. 301.

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