Sum Secrecy Rate Optimization in Heterogeneous Networks with D2D Communication and RIS

Document Type : Original Article

Authors

1 Telecommunication Department, Faculty of Electrical Engineering, K. N. Toosi University of Technology

2 Telecommunication Department,, Faculty of Electrical Engineering,, K.N. Toosi University of Technology

Abstract

With the emergence of Sixth Generation (6G) networks, there is an increasing need for wireless communications to securely and efficiently transmit high-capacity data. Reconfigurable Intelligent Surfaces (RIS) have been introduced as a highly potential technology for enhancing the security of Device-to-Device (D2D) heterogeneous communication networks. In this paper, the Sum Secrecy Rate (SSR) of a heterogeneous D2D network assisted by RIS is studied. Different from previous research in this area, multiple pairs of D2D with the use of RIS in the presence of multiple eavesdroppers are considered, leading to a non-convex optimization problem of maximizing the SSR. To solve this problem, it is divided into two sub-problems of power allocation and phase optimization of RIS, and by combining these sub-problems, a suboptimal value for the SSR is obtained. The results show that the combination of power allocation and phase optimization algorithms improves by 32.12% and 8.08% respectively, compared to the cases in which each is used alone. It is also observed that increasing the number of RIS elements and quantization bits improves SSR. Meanwhile, the impact of increasing the number of D2D pairs on the SSR of the system is influenced by the increase in the number of RIS elements.

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 04 December 2024

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