Secure Multiple Amplify-and-Forward Relaying Over Correlated Fading Channels
Secure Multiple Amplify-and-Forward Relaying Over Correlated Fading Channels
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DOI：
10.1109/tcomm.2017.2691712
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发表时间：
2017-04
影响因子：
8.3
通讯作者：
Lisheng Fan;Rui Zhao;Feng-kui Gong;Nan Yang;G. Karagiannidis
中科院分区：
文献类型：
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作者：
Lisheng Fan;Rui Zhao;Feng-kui Gong;Nan Yang;G. Karagiannidis
本文量化了相关衰落对多放大转发（AF）中继网络安全通信的影响。在这样的网络中，基站（BS）配备有多个天线并且通过多个AF中继与目的地通信，而来自中继的消息可以被窃听者偷听。我们专注于实际的通信场景中，主和窃听者的信道是相关的。为了增强传输安全性，在BS处执行发射天线选择，并且根据完全或部分中继选择准则来选择最佳中继，该准则分别依赖于双跳中继信道或第二跳中继信道。对于这些标准，我们研究了相关衰落对网络保密性能的影响，通过推导出一个解析近似的保密中断概率和一个渐近表达式的高主窃听比。从这些结果可以得出结论，信道相关性总是有利于全中继选择的保密性能。然而，它恶化的保密性能，如果使用部分中继选择，当在BS的天线的数量小于中继的数量。
This paper quantifies the impact of correlated fading on secure communication of multiple amplify-and-forward (AF) relaying networks. In such a network, the base station (BS) is equipped with multiple antennas and communicates with the destination through multiple AF relays, while the message from the relays can be overheard by an eavesdropper. We focus on the practical communication scenario, where the main and eavesdropper’s channels are correlated. In order to enhance the transmission security, transmit antenna selection is performed at the BS, and the best relay is chosen according to the full- or partial-relay selection criterion, which relies on the dual-hop relay channels or the second-hop relay channels, respectively. For these criteria, we study the impact of correlated fading on the network secrecy performance, by deriving an analytical approximation for the secrecy outage probability and an asymptotic expression for the high main-to-eavesdropper ratio. From these results, it is concluded that the channel correlation is always beneficial to the secrecy performance of full relay selection. However, it deteriorates the secrecy performance if partial-relay selection is used, when the number of antennas at the BS is less than the number of relays.