Telecommunications Science ›› 2022, Vol. 38 ›› Issue (1): 47-60.doi: 10.11959/j.issn.1000-0801.2022015

• Research and Development • Previous Articles     Next Articles

Secure communication optimization for double-IRS assisted SWIPT system

Jianfeng CHEN1, Miao CUI1,2, Guangchi ZHANG1,3, Qingqing WU4, Hui ZENG2   

  1. 1 School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
    2 No.7 Research Institute of China Electronics Technology Group Cooperation, Guangzhou 510310, China
    3 Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangzhou 510006, China
    4 State Key Laboratory of Internet of Things for Smart City, University of Macau, Macau 999078, China
  • Revised:2021-12-06 Online:2022-01-20 Published:2022-01-01
  • Supported by:
    The National Key Research and Development Program of China(2020YFB1805300);The Science and Technology Plan Project of Guangdong Province(2021A0505030015);The Science and Technology Plan Project of Guangdong Province(2020A050515010);The Science and Technology Plan Project of Guangdong Province(2019B010119001);Science and Technology Development Fund of Macau SAR(SKL-IOTSC(UM)-2021-2023);Science and Technology Development Fund of Macau SAR(0119/2020/A3);Science and Technology Development Fund of Macau SAR(0108/2020/A);The Natural Science Foundation of Guangdong Province(2021A1515011900);The Open Research Fund of National Mobile Communications Research Laboratory, Southeast University(2021D15);Special Support Plan for High-Level Talents of Guangdong Province(2019TQ05X409)

Abstract:

Two intelligent reflecting surfaces (IRS) was applied to ensure the physical layer security of the information transmission in a simultaneous wireless information and power transfer (SWIPT) system, where a multi-antenna base station (BS) simultaneously transmits information and energy to multiple single-antenna information receivers (IR) and energy receivers (ER) and the ERs are regarded as potential information eavesdroppers.The system deploys two IRSs to ensure the security of information transmission while meeting the requirements of energy transmission.Due to the inter-IRS signal reflection, the variables of the considered optimization problem are highly coupled, thus the problem is difficult to solve.To tackle this difficulty, an algorithm based on the alternating optimization, semidefinite relaxation, and successive convex approximation methods was proposed to obtain a suboptimal solution to the problem.Simulation results show that the proposed algorithm can significantly increase the total rate of the IRs and guarantee the security of the information transmission and the requirement of energy transmission, as compared to some existing benchmark schemes.

Key words: double-intelligent reflecting surface, simultaneous wireless information and power transfer, physical layer security

CLC Number: 

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