This paper presents field experimental results on block error rate (BLER) performance employing Adaptive Antenna Array-Transmit Diversity (AAA-TD) coupled with fast transmission power control (TPC) in the W-CDMA forward link. Experimental results elucidate that when AAA-TD with 6 antenna was applied, the required average transmission power of a base transceiver station (BTS) at the average BLER of 10{sup}(-2) with fast TPC was reduced by approximately 4 dB compared to that without fast TPC for the effective number of Rake fingers of approximately 2. We also clarified that even when the high-rate interfering user with the information bit rate of 384 kbps coexist, the interference from the high-rate user was effectually suppressed by using AAA-TD together with fast TPC, when the difference in look angle between the desired and interference users was greater than approximately 10 degrees. Furthermore, it was confirmed when angle spread among paths was approximately 5 degrees, the transmission power of a user equipment (UE) using AAA-TD at the average BLER of 10{sup}(-2) could be reduced using fast TPC up to the number of antennas of approximately 10 (beamwidth of 20 degrees).
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