TY - CHAP
T1 - Secure Beamforming Design for Reconfigurable Intelligent Surface Assisted Downlink Transmission
AU - Guo, Feiyang
AU - Huang, Chongwen
AU - Xu, Yongjun
AU - Yang, Zhaohui
AU - Shikh-Bahaei, Mohammad
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022/9/12
Y1 - 2022/9/12
N2 - Reconfigurable intelligent surface (RIS) is a promising technology to reconfigure the wireless channel, which can be used for signal modulation with low hardware cost. In this paper, the problem of resource allocation is investigated for an RIS assisted wireless communication system with one eavesdropper, where the RIS acts as a transmitter. The secure energy efficiency of the considered system is maximized via jointly optimizing the transmit power and phase beamforming of the RIS. To solve this problem, an alternating algorithm is proposed with optimizing transmit power and phase beamforming iteratively. With given transmit power, we apply the Schmidt orthogonalization to the channel and use the Dinkelbach method to iteratively derive the optimal phase beamformer by maximizing the secure energy efficiency. After solving the phase beamformer, we substitute the derived phase shifter to the previous optimization problem. By using the Dinkelbach method and analysing the solutions of the quadratic equation, we derive the optimal transmit power in closed form. Simulation results show that our proposed algorithm yields higher secure energy efficiency compared to the conventional schemes.
AB - Reconfigurable intelligent surface (RIS) is a promising technology to reconfigure the wireless channel, which can be used for signal modulation with low hardware cost. In this paper, the problem of resource allocation is investigated for an RIS assisted wireless communication system with one eavesdropper, where the RIS acts as a transmitter. The secure energy efficiency of the considered system is maximized via jointly optimizing the transmit power and phase beamforming of the RIS. To solve this problem, an alternating algorithm is proposed with optimizing transmit power and phase beamforming iteratively. With given transmit power, we apply the Schmidt orthogonalization to the channel and use the Dinkelbach method to iteratively derive the optimal phase beamformer by maximizing the secure energy efficiency. After solving the phase beamformer, we substitute the derived phase shifter to the previous optimization problem. By using the Dinkelbach method and analysing the solutions of the quadratic equation, we derive the optimal transmit power in closed form. Simulation results show that our proposed algorithm yields higher secure energy efficiency compared to the conventional schemes.
KW - convex optimization
KW - Reconfigurable intelligent surface
KW - resource allocation
UR - http://www.scopus.com/inward/record.url?scp=85139159375&partnerID=8YFLogxK
U2 - 10.1109/ICCWorkshops53468.2022.9882159
DO - 10.1109/ICCWorkshops53468.2022.9882159
M3 - Conference paper
AN - SCOPUS:85139159375
T3 - 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022
BT - 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022
Y2 - 16 May 2022 through 20 May 2022
ER -
