LLR-based decode-and-forward protocol for relay networks and closed-form BER expressions

被引：29

作者：

Khuong, Ho Van ^{[1
]}

Kong, Hyung Yun ^{[1
]}

机构：

[1] Univ Ulsan, Dept Elect Engn, Ulsan 680749, South Korea

来源：

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES | 2006年 / E89A卷 / 06期

关键词：

DFP; LLR; Rayleigh fading; AWGN;

D O I：

10.1093/ietfec/e89-a.6.1832

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

Decode-and-forward cooperative communications protocol (DFP) allows single-antenna users in wireless medium to obtain the powerful benefits of multi-antenna systems without physical antenna arrays. So far, only signal-to-noise ratio (SNR) or square amplitude of path gain has been used to evaluate the reliability of received signals for relays to decide whether to forward the decoded data so as to prevent unsuccessful detection at the relays. In this paper, we propose using log-likelihood ratio (LLR) as an alternative to SNR in the conventional DFP. Closed-form BER expressions for different versions of DFP are also derived and verified by Monte-Carlo simulations. A variety of numerical results reveal the significant superiority of LLR-based DFP to SNR-based DFP regardless of threshold level and relay position under flat Rayleigh fading channel plus additive white Gaussian noise (AWGN).

引用

页码：1832 / 1841

页数：10

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