| 摘要: |
| 针对智能反射面辅助的星地融合数能同传场景中的物理层安全问题，提出了一种鲁棒安全波束成形方法以提升系统安全性能。在地面物联网设备采用接收能量分割架构同时进行信息接收和能量采集的情况下，构建了以系统总发射功率最小化为目标，以卫星用户服务质量满足要求，同时保证卫星信号不被窃听者窃取以及物联网设备信息接收和能量采集满足要求为约束的联合优化问题。为了克服求解该非凸优化问题的困难，首先引入辅助变量进行松弛处理，并进一步提出一种新颖的半正定规划与伯恩斯坦（Bernstein）不等式相结合的鲁棒安全波束成形方法，从而获得较优性能的解。在不同地面用户速率阈值和不同天线规模的系统中，相比迫零波束成形方案和固定能量分割比方案，所提方案所需的功率分别能平均节省20%和11%，能够在有效满足不同种类用户的服务需求的同时实现对窃听者窃听行为的抑制。 |
| 关键词: 星地融合网络 智能反射面 数能同传（SWIPT） 多播传输 鲁棒波束成形 |
| DOI：10.20079/j.issn.1001-893x.240830001 |
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| 基金项目:国家自然科学基金资助项目（62471255，61801234）；江苏省研究生科研与实践创新计划项目(KYCX24_1174，KYCX23_1018) |
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| Robust Secure Beamforming Scheme for IRS-assisted SWIPT in Satellite-Terrestrial Integrated Network |
| MA Biao,ZHAO Bai,FENG Yifan,OUYANG Jian |
| (a.College of Telecommunications and Information Engineering;b.Portland Institute,Nanjing University of Posts and Telecommunications,Nanjing 210003,China) |
| Abstract: |
| Fro the physical layer security issue in the scenario of simultaneous wireless information and power transfer(SWIPT) in intelligent reflecting surface(IRS)-assisted satellite-terrestrial integrated network(STIN),a robust secure beamforming(BF) method is proposed to enhance system security performance.Under the condition that terrestrial Internet of Things(IoT) devices adopt a power splitting architecture for simultaneous information reception and energy harvesting,an optimization problem is formulated with the objective of minimizing the total system transmit power.The constraints include meeting the quality of service requirements for satellite users,ensuring that satellite signals are not intercepted by eavesdroppers,and satisfying the information reception and energy harvesting requirements of IoT devices.To address the challenges associated with solving this non-convex optimization problem,auxiliary variables for relaxation are introduced and subsequently a novel robust safe BF method is prsented that integrates semi-definite programming with the Bernstein inequality,yielding a solution with improved performance.In systems with varying ground user rate thresholds and antenna scales,the proposed method can save an average of 20% and 11% in power compared with zero-forcing BF schemes and fixed energy splitting schemes,respectively.The proposed algorithm effectively meets the service demands of diverse user types while suppressing eavesdropping activities. |
| Key words: satellite-terrestrial integrated network intelligent reflecting surface simultaneous wireless information and power transfer(SWIPT) multicast transmission robust beamforming |
