| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce as far as possible power consumption in each of a plurality of transmitting-receiving stations comprising a spread spectrum communication system, particularly, in a mobile subscriber station unit. <P>SOLUTION: In the spread spectrum communication system for maintaining an initial transmission power level of a non-active second transmitting-receiving station, a first transmitting-receiving station despreads a received signal by using a chip code to be selected associated with a specific spread spectrum signal from the second transmitting-receiving station and measures the power level of the despread specific signal. The second transmitting-receiving station transmits the specific spread spectrum signal to the first transmitter-receiver sometimes during a period in the non-active status, the first transmitting-receiving station receives the signal, measures a noise power level in a communication channel, estimates a system transmission power level, compares the measured value with the estimated value, and transmits an automatic power control (APC) signal to the second transmitting-receiving station on the basis of the compared result, and the second transmitting-receiving station adjusts the initial transmission power level in response to the APC signal. <P>COPYRIGHT: (C)2004,JPO |
