Joint Source and Relay Secure Beamforming for Nonregenerative MIMO Relay Systems With Wireless Information and Power Transfer
Joint Source and Relay Secure Beamforming for Nonregenerative MIMO Relay Systems With Wireless Information and Power Transfer
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DOI：
10.1109/tvt.2016.2633380
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发表时间：
2017-07
影响因子：
6.8
通讯作者：
Quanzhong Li;J. Qin
中科院分区：
文献类型：
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作者：
Quanzhong Li;J. Qin
同时无线信息和功率传输(SWIPT)能够延长能量受限无线网络的寿命。本文研究了具有SWIPT的非再生多输入多输出(MIMO)中继系统的安全问题。当窃听者的全部信道状态信息(CSI)已知时，我们的目标是通过联合设计源和中继波束形成矩阵来最大化多个EH接收机在源和中继发射功率约束和能量收集(EH)约束下的保密率，这是一个非凸优化问题，仍然是一个开放的问题。为了有效地提高保密率，我们首先将优化转化为凸规划的一个差分，并提出了一种能够达到局部最优的基于序贯参数凸近似的迭代算法。为了降低算法的复杂度，我们还提出了一种基于奇异值分解(SVD)的广义奇异值分解方法，将优化问题简化为源和中继器联合功率分配问题。采用交替优化方法求解联合功率分配问题的次优解。当窃听者的CSI未知时，我们提出了一种人工噪声(AN)辅助的信源和中继联合波束形成方案，该方案可以在有限的信源和中继发射功率下最大化干扰窃听者的AN功率，并满足接收方的服务质量。仿真结果表明了所提方案的有效性。
Simultaneous wireless information and power transfer (SWIPT) is able to prolong the lifetime of energy-constrained wireless networks. In this paper, we study the security issue of a nonregenerative multiple-input multiple-out (MIMO) relay system with SWIPT. When the full channel state information (CSI) of the eavesdropper is available, we aim to maximize the secrecy rate under the source and relay transmit power constraints and energy-harvesting (EH) constraints at the multiple EH receivers by jointly designing the source and relay beamforming matrices, which is a nonconvex optimization and is still an open problem. In order to enhance the secrecy rate effectively, we first transform the optimization into a difference of convex programming and propose a sequential parametric convex approximation-based iterative algorithm which is able to achieve a local optimum. To reduce the complexity, we also propose a singular value decomposition (SVD)-generalized SVD-based method to simplify the optimization into a joint source and relay power allocation problem. The alternating optimization is employed to find a suboptimal solution of the joint power allocation problem. When the CSI of the eavesdropper is unknown, we propose an artificial-noise (AN) aided joint source and relay beamforming scheme, which can maximize the AN power to jam the eavesdropper under the limited source and relay transmit power and satisfy the quality of service of the receiver. Simulation results have shown the effectiveness of our proposed schemes.