电讯技术2025，Vol.65Issue(7)：1060-1068,9.DOI:10.20079/j.issn.1001-893x.250116001
面向空时移键控的安全传输方案
A Secure Transmission Scheme for Space-Time Shift Keying Systems
摘要
Abstract
With the rapid development of 5G and the Internet of Things(IoT),low-power communications and physical layer security(PLS)have become critical issues that need to be addressed in communication systems.To tackle this challenge,a communication scheme combining space-time shift keying(STSK)with reconfigurable intelligent surface(RIS)is proposed,aiming to enhance the system's PLS while transmitting additional index information.Under constraints of transmit power,symbol power,and RIS phase shifts,the symbol constellation,STSK dispersion matrices,and transmit power allocation are jointly optimized to maximize the secrecy capacity of the system over discrete-input continuous-output memoryless channel(DCMC).A Riemannian conjugate gradient descent algorithm is developed,with theoretical gradients and projected gradients derived for variables,enabling the algorithm to balance convergence speed and stability simultaneously.Simulation results demonstrate that the proposed scheme effectively reduces eavesdropper performance while transmitting additional bits.Compared with benchmark algorithms,the proposed algorithm achieves superior solutions with higher numbers of reflective units,reaching 87.8%of the DCMC secrecy capacity upper bound.关键词
空时移键控(STSK)/物理层安全(PLS)/可重构智能面(RIS)/流形优化Key words
space-time shift keying(STSK)/physical layer security(PLS)/reconfigurable intelligent surface(RIS)/manifold optimization分类
信息技术与安全科学引用本文复制引用
穆辉辉,陈健,吕璐,杨龙..面向空时移键控的安全传输方案[J].电讯技术,2025,65(7):1060-1068,9.基金项目
国家自然科学基金资助项目(62271368,62371367) （62271368,62371367）
中央高校基本科研业务费(QTZX23066) （QTZX23066）
陕西省重点研发计划(2023-ZDLGY-50) （2023-ZDLGY-50）
