基于安全能量效率的全双工异构无线携能通信网络波束成形设计

A Beamforming Design for Full-Duplex Heterogeneous Network with SWIPT Based on Secrecy Energy Efficiency

关键词:  无线携能通信  异构网络  全双工  安全能量效率  波束成形  人工噪声

Key words:  Simultaneous Wireless Information and Power Transfer (SWIPT)  heterogeneous network  Full-Duplex (FD)  Secrecy Energy Efficiency (SEE)  beamforming  Artificial Noise (AN)

摘要:

为了解决全双工(Full-Duplex，FD)异构无线携能通信(Simultaneous Wireless Information and Power Transfer,SWIPT)网络中的传输安全问题，针对存在多个窃听者的通信场景，提出基于人工噪声(Artificial Noise，AN)辅助的FD异构SWIPT网络安全波束成形设计方案。该方案在满足安全发射功率阈值、最低安全速率以及收集能量等约束条件下，通过联合优化AN、信息信号波束成形矢量以及上行发射功率最大化安全能量效率(Secrecy Energy Efficiency,SEE)。针对安全能量效率优化问题的非凸性，提出一种基于Dinkelbach和连续凸近似的双层优化算法，通过半定松弛技术、泰勒级数展开、连续凸近似法将难以求解的非凸问题转化为凸问题，最后利用MATLAB软件中的凸优化工具箱CVX进行求解。仿真实验验证了波束成形设计方案能够实现安全传输，且对系统能效也有一定程度的提升。

Abstract:

To address the transmission security problem in Full-Duplex (FD) heterogeneous network with Simultaneous Wireless Information and Power Transfer (SWIPT),a secrecy beamforming design for full-duplex heterogeneous network with SWIPT based on Artificial Noise (AN) was proposed for communication scenarios with multiple eavesdroppers.Under the constraints of secrecy transmitting power threshold,minimum secrecy rate and energy harvesting,this design maximized the Secrecy Energy Efficiency (SEE) by jointly optimizing the AN,information signal beamforming vector and uplink transmission power.A two-layer optimization algorithm based on Dinkelbach and successive convex approximation was designed to solve the problem of non-convex of secrecy energy efficiency.The algorithm converted non-convex problem that is difficult to be solved into a convex problem by semi-definite relaxation,Taylor series expansion and successive convex approximation.Finally,the CVX (convex optimization toolbox) in MATLAB was used to solve it.The simulation results show that the beamforming design can achieve secrecy transmission and improve the energy efficiency of the system.