TY - JOUR
T1 - RIS-Aided Space-Terrestrial Secure Communication under Multi-Eavesdropper and Malignant Interference
AU - Yang, Ziyi
AU - Ni, Zihan
AU - Yue, Pingyue
AU - Pan, Gaofeng
AU - Wang, Shuai
AU - An, Jianping
N1 - Publisher Copyright:
© 1965-2011 IEEE.
PY - 2025
Y1 - 2025
N2 - 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.
AB - 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.
KW - Interference
KW - optimization
KW - reconfigurable intelligent surface
KW - secure communication
KW - space-terrestrial communication system
KW - wireless communicaton
UR - http://www.scopus.com/inward/record.url?scp=85215405090&partnerID=8YFLogxK
U2 - 10.1109/TAES.2025.3528387
DO - 10.1109/TAES.2025.3528387
M3 - Article
AN - SCOPUS:85215405090
SN - 0018-9251
JO - IEEE Transactions on Aerospace and Electronic Systems
JF - IEEE Transactions on Aerospace and Electronic Systems
ER -