RIS-Aided Space-Terrestrial Secure Communication under Multi-Eavesdropper and Malignant Interference

Ziyi Yang, Zihan Ni, Pingyue Yue*, Gaofeng Pan, Shuai Wang, Jianping An

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

In light of the growing necessity for secure satellite communications, harmful interference in channel transmission needs to be considered. By introducing Reconfigurable Intelligent Surfaces (RIS) into the wireless communication system, this paper presents a satellite-to-ground transmission system to mitigate harmful interference caused by unmanned aerial vehicle (UAV). We focus on downlink transmissions from satellites to users, examining both single-user and multi-user scenarios in the presence of multiple eavesdroppers (EVEs). This paper aims to maximize the achievable secrecy rate while adhering to the power constraints of the RIS and satellite transmitter, a nonconvex problem. To solve this problem, this paper employs several methods to the traditional alternating optimization (AO) algorithm to get an integrated advanced techniques method, which includes the LogSumExp function, genetic algorithms (GAs), Lagrange multipliers, derivation, and the branch-and-bound method and KKT conditions. The proposed framework encompasses ideal active and passive RIS configurations for single-user scenarios and practical continuously adjustable phase RIS and discrete phase RIS for multi-user scenarios. The efficacy of the proposed approach is validated through comprehensive simulations, which demonstrate significant performance improvements over baseline scenarios that lack RIS or employ random phase methods.

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Yang, Z., Ni, Z., Yue, P., Pan, G., Wang, S., & An, J. (已接受/印刷中). RIS-Aided Space-Terrestrial Secure Communication under Multi-Eavesdropper and Malignant Interference. IEEE Transactions on Aerospace and Electronic Systems. https://doi.org/10.1109/TAES.2025.3528387