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

计量
- 文章访问数: 2522
- HTML全文浏览量: 101
- PDF下载量: 637
- 被引次数: 0
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.

HTML全文

参考文献(1)

Tarokh V, Seshadri N, Calderbank R. Space-time codes for high data rate wireless communications: performance criterion and code construction[J].IEEE Trans. on Info. Theory.1998, 44(3):744-[2]3GPP, TSG RAN, WG1, Physical Layer Procedures (FDD), June,2000.[3]Derryberry R T, Gray S D, Ionescu D M, Mandyam G,Raghothaman B. Transmit diversity in 3G CDMA systems. IEEE Communications Magazine, 2002, 40(4): 68 - 75.[4]Hamalainen J, Wichman R. Closed-loop transmit diversity for FDD WCDMA systems. 34th Asilomar Conference on Signals,Systems and Computers, Pacific Grove, CA, USA, 29 Oct.-1 Nov.,2000, vol. 1: 111 - 115.[5]Da Silva M J, Taffin A, Lasaulce S, Buljore S. Closed loop transmit diversity enhancements for UMTS narrowband and wideband TD-CDMA. IEEE Veh. Technol. Conference, 2001.Spring, 2001, vol.3:1963 - 1967.[6]Nagaraj S, Huang Yih-Fang. Downlink transmit diversity:feedback efficiency and robustness. IEEE International Conference on Personal Wireless Communications, Hyderabad,India, 17-20 Dec., 2000: 14- 18.[7]Onggosanusi E N, Gatherer A, Dabak A G, Hosur S. Performance analysis of closed-loop transmit diversity in the presence of feedback delay[J].IEEE Trans. on Commun.2001, 49(9):1618-[8]Hwang Keun Chul, Lee Kwang Bok. Efficient weight vector representation for closed-loop transmit diversity. IEEE ICC 2002,New York, NY, USA, 2002, vol. 2:732 - 736.[9]Raghothaman B, Mandyam G, Derryberry R T. Performance of closed loop transmit diversity with feedback delay. 34th Asilomar Conference on Signals, Systems and Computers, Pacific Grove,CA, USA, 29 Oct.-1 Nov., 2000, vol.1: 102 - 105.[10]Hamalainen J, Wichman R. The effect of feedback delay to the closed-loop transmit diversity in FDD WCDMA. IEEE PIMRC2001, San Diego, CA, USA, 2001 vol.1: D-27 - D-31.[11]Papoulis A. Probability, Random Variables, and Stochastic Processes. New York: McGraw-Hill, Inc. 1991:86 - 124.[12]杨馨,董霄剑,尤肖虎.WCDMA系统发送分集技术的性能分析.电子学报,2002,30(7):986-989.

施引文献

资源附件(0)

访问统计