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

doi:10.13190/jbupt.200904.94.zhaosh

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2009, Vol. 32 ›› Issue (4): 94-98.doi: 10.13190/jbupt.200904.94.zhaosh

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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

Abstract

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

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

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