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| Performance Analysis of Closed Loop Transmit Diversity for WCDMA Systems in a Time Variant Fading Channel |
| Yang Xin;Li Jin;You XiaoHu |
| NCRL Southeast University Nanjing 210096 China |
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Abstract In this paper, the closed loop transmit diversity technique is investigated. The RAKE receiver model and the weighting vector algorithm are presented. Since the feedback delay in the practical systems has considerable effect on the receiver performance of the closed loop transmit diversity technique, the performance of the RAKE receiver with feedback delay in the time variant wireless channel is analyzed and compared with that of the open loop mode. Theoretical analysis and simulation results show that the closed loop transmit diversity technique outperforms the open loop technique in the environments with low speeds and low path signal-to-noise ratios.
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Received: 02 April 2004
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2005, Vol. 27 
