Abstract
This paper considers the physical layer security (PLS) of a simultaneous wireless information and power transfer (SWIPT) relay communication system composed of a legitimate source–destination pair and some eavesdroppers. Supposing a disturbance of channel status information (CSI) between relay and eavesdroppers in a bounded ellipse, we intend to design a robust beamformer to maximum security rate in the worst case on the constraints of relay energy consumption. To handle this non-convex optimization problem, we introduce a slack variable to transform the original problem into two sub-problems firstly, then an algorithm employing a semidefinite relaxation (SDR) technique and S-procedure is proposed to tackle above two sub-problems. Although our study was conducted in the scene of a direct link among source, destination, and eavesdroppers that is non-existing, we demonstrate that our conclusions can be easily extended to the scene for which a direct link among source, destination and eavesdroppers exist. Numerical simulation results compared with the benchmark scheme are provided to prove the effectiveness and superior performance of our algorithm.
Highlights
The future Wireless Sensor Network (WSN) or Internet of Things (IoT) network is composed of billions of energy-limited devices
The robust beamforming design related to the secrecy rate of Simultaneous wireless information and power transfer (SWIPT) WSN with relay is deeply discussed in this paper
Using S-procedure and semidefinite relaxation (SDR) techniques, the non-convex constraints of lowerlevel problem are transformed into a series of linear matrix inequalities (LMI) forms and iterative bisection methods are introduced to tackle the above decouple problem
Summary
The future Wireless Sensor Network (WSN) or Internet of Things (IoT) network is composed of billions of energy-limited devices. The robust sum rate optimization in non-orthogonal multiple access (NOMA) amplifying and forwarding (AF) relay networks is considered in [15], and the power allocation scheme and beamforming matrix are jointly optimized to achieve the maximum rate at the quality of service (QoS) constraints and relay transmission power constraints. A joint information beamforming and energy beamforming scheme based on semidefinite relaxation (SDR) and successive convex approximation (SCA) techniques is proposed to achieve the maximum secrecy rate of the multiple input single output (MISO) network [16], in which the CSI error is restrained in a bounded elliptic region. We propose the robust optimization method to maximize the security rate of the destination under the constraints such as transmission power of relay, signal to interference plus noise power ratio (SINR) of receiver, and CSI error between relay and eavesdroppers. E[] representing mathematical expectation. [ x ]+ is the abbreviation of max[ x, 0]
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