Shim Kyusung, Do Nhu Tri, An Beongku
Graduate School of Smart City Science Management, Hongik University, Seoul 30016, Korea.
Department of Electronics and Computer Engineering, Hongik University, Seoul 30016, Korea.
Sensors (Basel). 2017 Feb 15;17(2):377. doi: 10.3390/s17020377.
In this paper, we study the physical layer security (PLS) of opportunistic scheduling for uplink scenarios of multiuser multirelay cooperative networks. To this end, we propose a low-complexity, yet comparable secrecy performance source relay selection scheme, called the proposed source relay selection (PSRS) scheme. Specifically, the PSRS scheme first selects the least vulnerable source and then selects the relay that maximizes the system secrecy capacity for the given selected source. Additionally, the maximal ratio combining (MRC) technique and the selection combining (SC) technique are considered at the eavesdropper, respectively. Investigating the system performance in terms of secrecy outage probability (SOP), closed-form expressions of the SOP are derived. The developed analysis is corroborated through Monte Carlo simulation. Numerical results show that the PSRS scheme significantly improves the secure ability of the system compared to that of the random source relay selection scheme, but does not outperform the optimal joint source relay selection (OJSRS) scheme. However, the PSRS scheme drastically reduces the required amount of channel state information (CSI) estimations compared to that required by the OJSRS scheme, specially in dense cooperative networks.
在本文中，我们研究了多用户多中继协作网络上行链路场景下机会调度的物理层安全（PLS）。为此，我们提出了一种低复杂度但具有可比保密性能的源中继选择方案，称为所提源中继选择（PSRS）方案。具体而言，PSRS方案首先选择最不易受攻击的源，然后为给定的所选源选择使系统保密容量最大化的中继。此外，窃听者处分别考虑了最大比合并（MRC）技术和选择合并（SC）技术。从保密中断概率（SOP）方面研究系统性能，推导了SOP的闭式表达式。通过蒙特卡罗仿真验证了所开展的分析。数值结果表明，与随机源中继选择方案相比，PSRS方案显著提高了系统的安全能力，但性能不如最优联合源中继选择（OJSRS）方案。然而，与OJSRS方案所需的相比，PSRS方案极大地减少了信道状态信息（CSI）估计的需求量，特别是在密集协作网络中。
