Experimental evaluations on array antenna configuration of adaptive antenna array diversity receiver in W-CDMA reverse link

This paper investigates the influence of the number of antennas, the angle difference between the direction of arrival (DOA) of the desired signal and those of interfering signals, and the antenna arrangement on the BER performance of the coherent adaptive antenna array diversity (CAAAD) receiver in the wideband DS-CDMA (W-CDMA) reverse link. Experiments assuming high-rate interfering users were conducted in a radio anechoic room using a three-sectored antenna with a 120-degree beam (maximum number of antennas was six). The experimental results showed that the degree to which the interference was suppressed from high-rate users of the CAAAD receiver was significantly increased by increasing the number of antennas, especially when the number of interfering users was larger than degree of freedom of the CAAAD. It was also verified that although the BER performance of the CAAAD receiver significantly improved compared to a single sectored antenna; the improvement remarkably decreased when the DOA difference between the desired signal and interfering signals was within approximately +/-10-15 degrees irrespective of the number of antennas. Finally. we show that the BER performance difference between the linear and conformal arrangements was small when using the three-sectored antenna.