基于高空气象站（HAPS）网络的安全无线信息传输与能量收集
Secure Wireless Information Transfer and Energy Harvesting in HAPS-Based Network
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中文总结 AI 辅助
本研究针对HAPS网络的窃听风险与地面设备能量约束，提出带零陷定向天线的友好干扰与功率传输节点框架，推导相关性能表达式，验证了该框架可同时实现安全通信与能量收集，明确了系统参数的权衡关系。
中文摘要 AI 辅助
高空气象站（High-Altitude Platform Station, HAPS）是实现低功耗无线设备广域连接的有前景的支撑技术，尤其适用于偏远及服务不足的区域。然而，HAPS链路的强视距特性增加了被窃听的风险，而地面设备有限的能量预算仍是主要的运行约束。在本研究中，我们针对存在空间分布窃听者的HAPS网络，提出了一种安全无线信息与能量收集框架。该系统集成了配备零陷定向天线的友好干扰节点和功率传输节点，不仅能降低窃听者的接收质量，还可作为合法用户的额外射频能量源。用户侧采用时分切换的无线信息与功率传输架构。在该框架下，我们利用随机几何工具推导了联合速率-能量覆盖概率和平均保密速率的易处理表达式。数值与蒙特卡洛仿真结果验证了所开发的分析模型，并揭示了时间分配因子、每个用户周围的零陷区域半径以及干扰机发射功率之间的关键设计权衡。特别地，结果表明，适当协调的零陷定向干扰可同时支持安全通信和充足的无线功率传输，同时需要合理选择系统参数（如时间分配因子和干扰功率）来平衡收集的能量、通信可靠性和保密性能。
英文摘要
High-altitude platform station (HAPS) serves as a promising enabler for wide-area connectivity of low-power wireless devices, particularly in remote and underserved regions. However, the strong line-of-sight characteristics of HAPS links increase the risk of eavesdropping, while the limited energy budget of ground devices remains a major operational constraint. In this work, we propose a secure wireless information and energy harvesting framework for HAPS-based networks in the presence of spatially distributed eavesdroppers. The proposed system integrates friendly jamming and power transfer nodes equipped with null-steering capability antennas, such that they not only degrade the reception quality at eavesdroppers but also act as additional radio-frequency energy sources for legitimate users. A time-switching wireless information and power transfer architecture is adopted at the user side. Under this framework, we derive tractable expressions for the joint rate-energy coverage and the average secrecy rate using stochastic geometry tools. Numerical and Monte Carlo results validate the developed analysis and reveal key design trade-offs among the time allocation factor, null-steering-zone radius around each user, and jammer transmit power. In particular, the results show that properly coordinated null-steering jamming can simultaneously support secure communication and adequate wireless power transfer, while an appropriate choice of system parameters, such as time allocation factor and jamming power, is required to balance harvested energy, communication reliability, and secrecy performance.
