A quantized reliability-relay selection method for wireless cooperative communications

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI:10.1109/ISWCS.2014.6933369

Wassim Alexan, A. El-Mahdy

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引用次数: 6

Abstract

In this paper, we propose a relay selection method for cooperative communication systems (CCS) employing the QPSK modulation scheme. The relay nodes forward their reliability to the destination node, utilizing a quantized reliability-relaying (QRR) scheme. The reliability is divided into five different levels by the relay nodes, according to the log-likelihood ratio (LLR) value of the received signal from the source node. Then, a suitable symbol is forwarded to the destination node if the relay node is set as active. A relay node is set as active if the reliability of the received signal is beyond a certain threshold. We provide analysis of the LLR for QPSK and carry out numerical simulations comparing the bit error rate (BER) of the QRR method against regular decode-and-forward (DF) and the best relay selection algorithms. A channel estimation algorithm is utilized to evaluate the performance of the system, as well as calculations of the normalized mean squared error (NMSE) of the channels. The special case of a system employing BPSK is also investigated.

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一种无线协同通信量化可靠性中继选择方法

本文提出了一种采用QPSK调制方案的协作通信系统中继选择方法。中继节点利用量化可靠性中继(QRR)方案将其可靠性转发到目的节点。中继节点根据从源节点接收到的信号的对数似然比(LLR)值，将可靠性划分为五个不同的级别。然后，如果中继节点设置为活动状态，则将合适的符号转发到目的节点。如果接收到的信号的可靠性超过某个阈值，则中继节点被设置为活动状态。我们对QPSK的LLR进行了分析，并进行了数值模拟，比较了QRR方法与常规译码转发(DF)和最佳中继选择算法的误码率(BER)。利用信道估计算法来评估系统的性能，并计算信道的归一化均方误差(NMSE)。本文还研究了采用BPSK的系统的特殊情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 11th International Symposium on Wireless Communications Systems (ISWCS)

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