Experiments on Coherent Adaptive Antenna Array Diversity Receiver Based on Antenna-Weight Generation Common to Paths in W-CDMA Reverse Link(Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)

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This paper presents laboratory and field experimental results of the coherent adaptive antenna array diversity (CAAAD) receiver employing receiver antenna-weight generation common to all Rake-combined paths (hereafter path-common weight generation method) in the W-CDMA reverse link, in order to elucidate the suitability of the path-common weight generation method in high-elevation antenna environments such as cellular systems with a macrocell configuration. Laboratory experiments using multipath fading simulators and RF phase shifters elucidate that even when the ratio of the target E_b/I_0 of the desired to interfering users is ΔE_b/I_0=-12dB, the increase in the average transmit E_b/N_0 employing the CAAAD receiver coupled with fast transmission power control (TPC) using outer-loop control from that for ΔE_b/I_0=0dB is within only 1.0dB owing to the accurate beam and null steering associated with fast TPC. Furthermore, field experiments demonstrate that the required transmission power at the average block error rate (BLER) of 10^-2 employing the CAAAD receiver with four antennas is reduced by more than 2dB compared to that using a four-branch space diversity receiver using maximum ratio combining (MRC) with the fading correlation between antennas of 0 when ΔE_b/I_0=-15dB and that the loss in the required transmission power of the CAAAD receiver in the same situation as that in a single-user environment is approximately 1dB. The field experimental results in an actual propagation environment suggest that the CAAAD receiver is effective in suppressing multiple access interference, thus decreasing the required transmission power when the gap in the direction of arrival between the desired user and interfering users is greater than approximately 20 degrees.
社団法人電子情報通信学会の論文
2003-01-01

Experiments on Coherent Adaptive Antenna Array Diversity Receiver Based on Antenna-Weight Generation Common to Paths in W-CDMA Reverse Link(Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)

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