时变衰落信道中WCDMA系统闭环发送分集的性能分析

杨馨; 李晋; 尤肖虎

时变衰落信道中WCDMA系统闭环发送分集的性能分析

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出版历程
- 收稿日期: 2004-04-02
- 修回日期: 2004-11-08
- 刊出日期: 2005-09-19

Performance Analysis of Closed Loop Transmit Diversity for WCDMA Systems in a Time Variant Fading Channel

摘要

摘要: 该文针对WCDMA标准中采用的闭环分集技术,给出了RAKE接收算法模型及反馈的加权矢量算法,进而分析了时变衰落信道中存在反馈链路延迟时闭环发送分集的接收性能,并与开环分集技术的接收性能进行了比较,指出了开环和闭环发送分集技术适用的不同移动环境.理论推导及仿真结果表明闭环发送分集在低速移动和较低路径信噪比环境下具有优于开环分集的接收性能.
- 第三代移动通信; WCDMA; RAKE接收机; 发送分集; 闭环发送分集
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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