基于IRS辅助的SWIPT物联网系统安全波束成形设计

doi:10.11959/j.issn.1000-436x.2021060

Abstract

Abstract:

In order to meet the new requirements of intelligent signal processing deployment and physical layer security for green interconnection of things, a design method of secure beamforming was proposed to solve the problem of the shortage of sustainable energy supply in the information and energy transmission at the same time Internet of things (IoT) system assisted by intelligent reflecting surface (IRS).Considering the constraints of secrecy rate, transmit power and IRS reflection phase shift, the optimization problem was modeled as a non-convex quadratic programming problem with quadratic constraints, aiming at maximizing the acquisition power of energy collector, and jointly optimizing the base station transmit beamforming matrix, jammer covariance matrix and IRS phase shift.The non-convex quadratic problem was transformed into an equivalent convex problem by using the relaxation variable, semidefinite relaxation method, auxiliary variable and sequence parameter convex approximation method, and an alternative iterative optimization algorithm was proposed to obtain the feasible solution of the original problem.Simulation results show that the proposed algorithm can converge quickly and improve performance effectively compared with the benchmark scheme.

Key words: intelligent reflecting surface, Internet of things, simultaneous wireless information and power transfer system, secure beamforming, energy harvest

CLC Number:

TN92

Zhengyu ZHU, Jinlei XU, Gangcan SUN, Ning WANG, Wanming HAO. Secure beamforming design for IRS-assisted SWIPT Internet of things system[J]. Journal on Communications, 2021, 42(4): 185-193.

Figures/Tables 7

References 9

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参数名称	取值
每米的路径损耗L/dB	30
基站、干扰机与IRS间路径损耗指数	2.4
IRS与EHR、Eve、IoT设备间路径损耗指数	2.4
基站、干扰机与 EHR、Eve、IoT 设备间路径损耗指数噪声方差σ²/dBm	3
采集效率ξ	-105
基站发射功率P_B/W	0.5
干扰机发射功率P_J/W	15

Secure beamforming design for IRS-assisted SWIPT Internet of things system

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