时变瑞利信道下反馈时延对选择发送分集性能的影响

doi:10.13190/jbupt.200904.94.zhaosh

北京邮电大学学报 ›› 2009, Vol. 32 ›› Issue (4): 94-98.doi: 10.13190/jbupt.200904.94.zhaosh

时变瑞利信道下反馈时延对选择发送分集性能的影响

赵爽杨鸿文

北京邮电大学信息与通信工程学院北京邮电大学

收稿日期:2008-11-30 修回日期:2009-04-10 出版日期:2009-08-28 发布日期:2009-08-28
通讯作者: 赵爽

The Impact of Feedback Delay to the Performance of Selective Transmit Diversity under TimeVarying Rayleigh Channel

Zhao Shuang hongwen yang

Received:2008-11-30 Revised:2009-04-10 Online:2009-08-28 Published:2009-08-28
Contact: Zhao Shuang

摘要/Abstract

摘要：

研究了在时变瑞利衰落信道下，存在反馈时延的选择发送分集（STD）系统的性能. 推导了存在反馈时延时，STD系统的输出信噪比分布和BPSK调制的误比特率(BER)表达式. 分析并证明了在此种情况下，STD系统的BER实际由2部分组成：一部分是无反馈时延的理想STD系统的BER；另一部分是分集度为1的BER“平台”. 指出只要反馈时延存在（无论多小），任何STD系统的理论分集度都为1.

关键词: 选择发送分集 (STD), 反馈时延, 误比特率&ldquo, 平台&rdquo, 分集度

Abstract:

The performance of selective transmit diversity (STD) with feedback delay is investigated under timevarying Rayleigh channel. First, the closedform expressions of the receiver output signaltonoise ratio (SNR) distribution are derived and validated via simulation. Based on these results, the bit error rate (BER) of BPSK modulation is obtained. It is shown that the BER of STD system consists of two parts: the BER of an ideal STD system without feedback delay plus an error floor of diversity order one representing the contribution of delayed feedback. No matter how small the feedback is, the error floor always exists. In consequence, the theoretical diversity order is one for any STD system with none zero feedback delay.

Key words: selective transmit diversity (STD), feedback delay, error floor, diversity order

赵爽杨鸿文. 时变瑞利信道下反馈时延对选择发送分集性能的影响[J]. 北京邮电大学学报, 2009, 32(4): 94-98.

Zhao Shuang hongwen yang. The Impact of Feedback Delay to the Performance of Selective Transmit Diversity under TimeVarying Rayleigh Channel[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2009, 32(4): 94-98.

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时变瑞利信道下反馈时延对选择发送分集性能的影响

The Impact of Feedback Delay to the Performance of Selective Transmit Diversity under TimeVarying Rayleigh Channel

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