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首页> 外文期刊>Journal of Communications and Networks >Performance Analysis of Decode-and-Forward Relaying with Partial Relay Selection for Multihop Transmission over Rayleigh Fading Channels
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Performance Analysis of Decode-and-Forward Relaying with Partial Relay Selection for Multihop Transmission over Rayleigh Fading Channels

机译：瑞利衰落信道上多跳传输的具有部分中继选择的解码转发中继的性能分析

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摘要

Multihop transmission is a promising technique that helps in achieving broader coverage (excellent network connectivity) and preventing the impairment of wireless channels. This paper proposes a cluster-based multihop wireless network that makes use of the advantages of multihop relaying, i.e., path loss gain, and partial relay selection in each hop, i.e., spatial diversity. In this partial relay selection, the node with the maximum instantaneous channel gain will serve as the sender for the next hop. With the proposed protocol, the transmit power and spectral efficiency can be improved over those in the case of direct transmission and conventional multihop transmission. Moreover, at a high signal-to-noise ratio (SNR), the performance of the system with at least two nodes in each cluster is dependent only on the last hop and not on any of the intermediate hops. For a practically feasible decode-and-forward relay strategy, a compact expression for the probability density function of the end-to-end SNR at the destination is derived. This expression is then used to derive closed-form expressions for the outage probability, average symbol error rate, and average bit error rate for M-ary square quadrature amplitude modulation as well as to determine the spectral efficiency of the system. In addition, the probability of SNR gain over direct transmission is investigated for different environments. The mathematical analysis is verified by various simulation results for demonstrating the accuracy of the theoretical approach.
机译：多跳传输是一种有前途的技术，可帮助实现更广泛的覆盖范围（出色的网络连接性）并防止无线信道受到损害。本文提出了一种基于群集的多跳无线网络，该网络利用了多跳中继的优势（即路径损耗增益）和每跳中的部分中继选择（即空间分集）。在此部分中继选择中，具有最大瞬时信道增益的节点将用作下一跳的发送方。利用所提出的协议，与直接传输和常规多跳传输的情况相比，可以提高传输功率和频谱效率。此外，在高信噪比（SNR）的情况下，每个群集中至少有两个节点的系统的性能仅取决于最后一跳，而不取决于任何中间跳。对于实际可行的解码转发中继策略，导出了目的地处端到端SNR的概率密度函数的紧凑表达式。然后，可以使用该表达式来得出M进制平方正交幅度调制的中断概率，平均符号错误率和平均误码率的闭式表达式，并确定系统的频谱效率。另外，针对不同的环境研究了直接传输上SNR增益的可能性。通过各种仿真结果验证了数学分析，以证明理论方法的准确性。

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