Patent ID: 6678309
Filing Date: 2004-01-13
Classification: H04B,H04W

Abstract:
A CDMA base station system for receiving a spread signal transmitted from a mobile station system with a plurality of antennas, imparting transmission weights to the respective antennas for controlling the overall directivity of the antennas, and transmitting a spread signal to the mobile station system as a transmission partner with a transmission power corresponding to the mobile station system as the transmission partner, comprising:a reference signal detecting means for detecting, as a reference signal, a signal received from the mobile station system as the transmission partner corresponding to a transmission power equal to or higher than a predetermined threshold value; a compensation-free signal detecting means for detecting, as compensation-free signals, signals received from other mobile station systems corresponding to transmission powers which are higher than the transmission power corresponding to the mobile station system as the transmission partner; and a transmission means for calculating transmission weights based on reception weights of the antennas in order to reduce the reception level of another signal than the detected reference signal and the detected compensation-free signals and increase the reception level of the reference signal, and transmitting the spread signal to the mobile station system as the transmission partner using the calculated transmission weights.