Two-Stage Relay Selection for Enhancing Physical Layer Security in Non-Orthogonal Multiple Access
Two-Stage Relay Selection for Enhancing Physical Layer Security in Non-Orthogonal Multiple Access
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DOI：
10.1109/tifs.2018.2883273
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发表时间：
2019-06
影响因子：
6.8
通讯作者：
Youhong Feng;Shihao Yan;Chenxi Liu;Zhen Yang;Nan Yang
中科院分区：
文献类型：
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作者：
Youhong Feng;Shihao Yan;Chenxi Liu;Zhen Yang;Nan Yang
在本文中，我们研究了合作中继网络的物理层安全性，其中两个源-目的地对通过解码和转发（DF）中继在存在多个窃听者的情况下进行通信。为了保障合法通信不被窃听，提出了一种新的两阶段安全中继选择（TSSRS）和非正交多址接入（NOMA）方案，以最大化一个源-目的地对的容量，同时保证另一个源-目的地对的成功通信.为了明确揭示我们提出的方案的好处，我们推导出其保密中断概率的精确和渐近表达式。作为基准，我们还分析了TSSRS策略的保密性能与正交多址（OMA）计划。理论分析和仿真结果都表明，当源端和中继端的发射功率处于低功率和中等功率时，我们提出的TSSRS-NOMA方案的性能明显优于TSSRS-OMA方案。此外，我们表明，TSSRS-NOMA方案的优势，TSSRS-OMA方案变得明显时，两个源-目的地对有着深刻不同的保密要求。
In this paper, we examine the physical layer security of a cooperative relay network where two source-destination pairs communicate through a decode-and-forward (DF) relay in the presence of multiple eavesdroppers. To safeguard the legitimate communications against eavesdropping, we propose a novel two-stage secure relay selection (TSSRS) with a non-orthogonal multiple access (NOMA) scheme to maximize the capacity of one source-destination pair, while guaranteeing the successful communication of the other source-destination pair. To explicitly reveal the benefits of our proposed scheme, we derive the exact and asymptotic expressions for its secrecy outage probability. As a benchmark, we also analyze the secrecy performance of the TSSRS strategy with an orthogonal multiple access (OMA) scheme. Both theoretical analysis and simulation results demonstrate that our proposed TSSRS-NOMA scheme significantly outperforms the TSSRS-OMA scheme when the transmit power at the source and relay is in the low and medium regimes. In addition, we show that the advantage of the TSSRS-NOMA scheme over the TSSRS-OMA scheme becomes obvious when the two source-destination pairs have profoundly different secrecy requirements.