Receiver for receiving a spectrum dispersion signal

Details Receiver for receiving a spectrum dispersion signal Receiver for receiving a spectrum dispersion signal

2006-04-25

2006-04-25

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Spread spectrum

C375S354000, C370S503000, C370S311000, C455S343200

Reexamination Certificate

active

07035309

ABSTRACT:
A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period t1by means of a low-power timer51so that a VC-TCXO1,a reference signal group generation unit2and a receiving unit3are turned off and a modem unit4is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer44is supplied with a start (d) to require counting of time t3and a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculator46during a period t3to obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time t4are calculated on the basis of the indication value i to be set. When the high-accuracy timer44counts t3and produces0V(d), demodulation operation by a rake demodulation unit40,a demultiplexing unit41and a descrambler unit42is started in accordance with the setting and is continued during the reception time t4.

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