重庆大学学报2025，Vol.48Issue(10)：56-67,12.DOI:10.11835/j.issn.1000-582X.2025.10.006
基于隐蔽信息映射的广义空间方向调制系统的物理层安全增强技术
Physical layer security enhancement techniques for covert information-mapped generalized spatial and direction modulation
摘要
Abstract
To address the vulnerability of UAV-based air-to-ground communication links to eavesdropping,this paper proposes a covert information-mapped generalized spatial and direction modulation(CIM-GSDM)system.In this system,information is concealed within the indices of activated receiver subsets and their selection combinations,while artificial noise orthogonal to the legitimate channel is introduced to disrupt potential eavesdroppers.To further enhance transmission security,a joint optimization framework for the precoding matrix and power allocation factor is developed,effectively managing multi-beam transmission and the distribution of artificial noise.The physical layer security metric,based on the system's secrecy rate,is derived and used as the optimization objective.To solve the resulting non-convex joint optimization problem,alternating optimization of the precoding matrix and power allocations factor is employed.A natural gradient descent method with Nesterov's acceleration is proposed to efficiently update the precoding matrix,addressing computational complexity due to the large CIM-GSDM symbol candidate set.Furthermore,a suboptimal closed-form solution for the power allocation factor is derived based on maximizing the product of the legitimate user's signal-to-noise ratio(SNR)and the eavesdropper's interference-to-signal-plus-noise ratio(ISNR).Simulation results demonstrate that the proposed optimization algorithm significantly reduces the eavesdropper's interception rate while ensuring the legitimate user's achievable rate,effectively guaranteeing secure transmission in the CIM-GSDM system.Compared to traditional beamforming algorithms and fixed power allocation methods,the proposed algorithm achieves superior security performance.关键词
广义空间方向调制/隐蔽信息映射/人工噪声/安全速率优化/物理层安全增强Key words
generalized spatial and directional modulation/covert information mapping/artificial noise/secrecy rate optimization/physical layer security enhancement分类
信息技术与安全科学引用本文复制引用
李湘鲁,向悠扬,周劼,丁辰,胡清波,郝酝琦,罗颖,侯冬,田杰..基于隐蔽信息映射的广义空间方向调制系统的物理层安全增强技术[J].重庆大学学报,2025,48(10):56-67,12.基金项目
中国工程物理研究院院长基金(YZJJZL2024076,YZJJZQ2023012) （YZJJZL2024076,YZJJZQ2023012）
国家自然科学基金(62441111) （62441111）
四川省科技计划(2024NSFSC0476,2025YFHZ0199).Supported by the CAEP Foundation(YZJJZL2024076,YZJJZQ2023012),National Natural Science Foundation of China(62441111),and Sichuan Science and Technology Program(2024NSFSC0476,2025YFHZ0199). （2024NSFSC0476,2025YFHZ0199）
