RADIO COMMUNICATION APPARATUS AND TRANSMISSION POWER CONTROLLING METHOD

摘要

An AAA receiving circuit 105 calculates reception weight of signals received by adaptive array antennas 101, and a direction of arrival estimating circuit 106 estimates a direction of arrival of the received signals. A demodulating circuit demodulates the received signals to separate transmission power control information. A radiation pattern calculating circuit 108 calculates directional gains based on the reception weight and the arrival direction of the received signals. A gain controlling circuit 109 calculates a correction value based on the directional gains and transmission power control information, and controls a gain of a transmission power amplifier. A transmission weight calculating circuit calculates transmission weight based on the reception weight and the correction value. This makes it possible to control transmission power such that reception power of each communication counterpart becomes constant, and to improve communication quality and an increase in the number of containable users in a system wherein directivity is sequentially changed in accordance with the positions of the communication counterparts or a propagation environment.