Performance of closed loop transmit diversity in a Rayleigh fading channel |
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Authors: | Xin Yang Doctor Xiaohu You |
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Affiliation: | National Mobile Comm.Research Lab,Dept of Radio Eng.,Southeast Univ.,Nanjing 210096,China |
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Abstract: | In this paper, the closed loop transmit diversity technology for the Wideband Code Division Multiple Access(WCDMA) systems is investigated in a multipath Rayleigh fading channel. The RAKE receiver model and the weighing vector algorithm are presented. The performance is theoretically analyzed in terms of the average maximal Signal-to-Noise Ratio(SNR) gain available over the Space-Time block coding based Transmit Diversity(STTD) technology. Theoretic analysis and simulation results show that the closed loop transmit diversity can provide a 3dB performance gain over the open loop scheme in a single path fading channel, while the performance gain decreases dramatically with the increasing inherent multipath diversity of the wireless channel. |
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Keywords: | Wideband Code Division Multiple Access(WCDMA) Transmit diversity Closed loop Open loop Space-time coding |
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