| 摘要: |
| 为增强多窃听者场景下的卫星-地面协同通信系统数据传输安全性，首先建立以卫星链路物理层安全传输速率最大化为优化准则、地面链路传输质量和信号发送功率为约束条件的卫星-地面协同传输优化问题。由于该优化问题的非凸性，随后通过引入辅助变量，将原问题分解为主、次两个子问题进行迭代求解，其中主问题为一维搜索问题，次问题则需进一步借助半正定松弛和矩阵变换方法转换为等价凸优化问题。最终，提出一种基于物理层安全的卫星-地面协同传输设计方案。计算机仿真结果表明，信号发射功率和卫星天线数的增加可提升系统安全速率，而窃听者数量的增加则会使得系统安全性降低。 |
| 关键词: 卫星-地面协同通信系统 物理层安全 波束成形 凸优化 |
| DOI： |
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| 基金项目:南京邮电大学校级科研基金（NY214140，NY215135）；国防科技项目 |
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| Physical layer security transmission design for a satellite-terrestrial coordinated communication system |
| OUYANG Jian,XU Ba,YUAN Can,JIANG Yangwei,ZHUANG Tianxing |
| () |
| Abstract: |
| In order to enhance the secure transmission of satellite-terrestrial coordinated communication system in presence of multiple eavesdroppers, a coordinated transmission optimization problem is established by applying security rate as the maximization criterion and the transmission quality for the terrestrial link and the transmission power for the satellite and ground base station as constraints. Next, due to the non-convexity of the optimization problem, the auxiliary variable method is used to decompose the original problem into two sub-problems. The main problem is a one-dimensional search problem, whereas the secondary problem can be transformed into a convex problem by means of semi-definite relaxation and the matrix transformation approaches. Finally, a satellite-terrestrial coordinated transmission scheme based on physical layer security is proposed to find the optimal beamforming solution. Computer simulation demonstrates that the increase of signal transmission power and the number of satellite antennas can increase the security rate, while the increase of the number of eavesdroppers will reduce the system security. |
| Key words: satellite-terrestrial coordinated communication system physical layer security beamforming convex optimization |
