Secure and Energy-Efficient Resource Allocation for Wireless Power Enabled Full-/Half-Duplex Multiple-Antenna Relay Systems
Secure and Energy-Efficient Resource Allocation for Wireless Power Enabled Full-/Half-Duplex Multiple-Antenna Relay Systems
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DOI：
10.1109/tvt.2017.2733040
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发表时间：
2017-07
影响因子：
6.8
通讯作者：
Zheng Chang;Xin Hou;Xijuan Guo;T. Ristaniemi;Zhu Han
中科院分区：
文献类型：
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作者：
Zheng Chang;Xin Hou;Xijuan Guo;T. Ristaniemi;Zhu Han
在本文中，我们同时考虑了启用无线功率传输(WPT)的中继系统的能量效率和安全性问题。在所考虑的系统中，多天线译码转发中继节点(RN)同时具有信息解码和无线功率回收能力，因此可以通过WPT来授权并辅助从多天线基站(BS)到移动终端(MTS)的传输。此外，我们认为在BS和RN之间有一个窃听者，它试图窃听发送到MT的信息。我们建立了一个联合优化问题，目标是通过考虑WPT时间分配、功率分配和保密数据速率来优化系统的能量效率。特别是，我们建议根据不同的分配优先级来选择RN，以确保信息传输的物理层安全。此外，我们还考虑了无线网络采用半双工和全双工协议的情况，并对相应的系统性能进行了分析研究。通过大量的仿真对所提出的方案进行了评估，结果表明，所提出的资源分配方案能够实现能量效率最大化，并具有优于其他方案的性能。
In this paper, we consider both energy efficiency and security issues in a wireless power transfer (WPT) enabled relay system. In the considered system, the multiple-antenna decode-and-forward relay node (RN) has both information decoding and wireless power recycling capabilities, and thus can be empowered by WPT and assist the transmission from the multiple-antenna base station (BS) to the mobile terminals (MTs). In addition, we consider that there is an eavesdropper between the BS and the RNs, which tries to overhear the information sent to the MTs. We formulate a joint optimization problem with the objective to optimize energy efficiency of the presented system by considering WPT time allocation, power allocation, and secrecy data rate. In particular, we propose to select RNs based on different assigned priorities so that the physical layer security of information transmission can be guaranteed. Moreover, we take into consideration of the cases that the RNs adopt the half- and full-duplex protocols, and study the corresponding system performance analytically. The proposed schemes are evaluated by extensive simulations and it is demonstrated that the proposed resource allocation schemes can obtain energy efficiency maximization, and have superior performance over other schemes.