分布式卫星系统中的物理层安全波束成形算法  

Physical Layer Secure Beamforming Algorithm for Distributed Satellite Systems

作　　者：邵一焓 王薇[2] 王子宁 黄庶沛 韩略 SHAO Yihan;WANG Wei;WANG Zining;HUANG Shupei;HAN Lue(College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]中国电子科技集团公司第五十四研究所,石家庄050081

出　　处：《电讯技术》2024年第9期1450-1458,共9页Telecommunication Engineering

基　　金：复杂电子系统仿真实验室基础研究课题(614201003012206)。

摘　　要：针对分布式卫星系统中的安全传输问题,提出两种协作波束成形算法。首先,针对分布式卫星系统采用放大转发协议将来自静止轨道的卫星信号转发至合法用户的场景,构建以最小化分布式卫星系统的总发射功率为目标、合法用户安全速率和非目标用户受到的干扰满足要求为约束条件的优化问题。其次,为求解该非凸优化问题,提出一种基于拉格朗日对偶和半正定规划相结合的协作波束成形算法,并得出最优波束成形权矢量。此外,提出一种基于部分迫零的次优协作波束成形算法,可在不折损系统性能要求的条件下有效降低实现复杂度。相较于传统迫零算法,所提最优和次优算法能够分别节省20 dB和15 dB左右的功率。Two cooperative beamforming algorithms are proposed to achieve secrecy transmission in distributed satellite systems.First,for the scenario where the distributed satellite system adopts amplify-and-forward protocol to forward the signals from geostationary Earth orbit satellite to its legitimate user,an optimization problem is formulated with the aim of minimizing the total transmit power of the distributed satellite systems,while subjecting to the achievable secrecy rate threshold of legitimate user and the interference budget of unintended users.Then,in order to address this non-convex problem,a cooperative beamforming algorithm combing Lagrange duality and semidefinite programming is proposed,based on which the optimal beamforming vector is obtained.Furthermore,a suboptimal cooperative beamforming algorithm based on partial zero-forcing is also proposed to reduce the computational complexity without compromising system performance requirements.Compared to traditional zero forcing algorithms,the proposed optimal and suboptimal algorithms can save around 20 dB and 15 dB of power,respectively.

关 键 词：分布式卫星系统 物理层安全 协作波束成形 半正定规划 

分 类 号：TN927[电子电信—通信与信息系统]