| 摘要 |
<p>A system which sequentially changes a directivity according to a location of a communication destination and a transmission environment, wherein an AAA receiving circuit (105) calculates the receiving weight of a signal received by an adaptive array antenna (101), an arrival direction estimating circuit (106) estimates the arrival direction of a received signal, a demodulation circuit demodulates the received signal and separates transmitting power control information, a directivity calculation circuit (108) calculates a directivity gain based on the receiving weight and the arrival direction of the received signal, a gain control circuit (109) calculates a correction value based on the directivity gain and the transmitting power control information to control the gain of a transmission power amplifier, and transmission weight calculation circuit calculates a transmitting weight based on the receiving weight and the correction value, whereby a transmitting power is controlled so as to make constant a received power of the communication destination, enhance a communication quality and increase the number of users that can be accommodated.</p> |
