Experiments on Decision Feedback Type Coherent Adaptive Antenna Array Diversity Receiver in W-CDMA Reverse Link (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)

概要

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This paper proposes a receiver antenna weight-updating algorithm using I/Q-code multiplexed pilot and decision feedback data symbols after channel decoding for both reference signal generation of the mean squared error (MSE) calculation and channel estimation (also for Rake combining) in the coherent adaptive antenna array diversity (CAAAD) receiver and investigates its performance, in order to decrease further the transmit power of a mobie station, thereby increasing system capacity in the wide band direct sequence code division multiple access (W-CDMA) reverse link. Experimental results show that the required transmit E_b/N_o for the average BER of 10^<-3> with the CAAAD receiver using pilot and decision feedback data symbols after channel decoding both for reference signal generation and for channel estimation can be decreased by approximately 0.8dB compared to when using only pilot symbols with convolutional coding or turbo coding, when the ratio of the target E_b/I_o for fast transmit power control of the desired to interfering users is ΔE_b/I_o = -12dB. The results also elucidate that the required transmit E_b/N_o at the average BER of 10^<-6> with turbo coding using the proposed decision feedback antenna weight-updating and channel estimation is smaller by approximately 0.5dB than that using convolutional coding when the channel interleaving length is 20 msec for ΔE_b/I_o = -12dB.
社団法人電子情報通信学会の論文
2001-07-01