射频能量采集是一种从射频信号中提取能量的技术，该技术可为能量受限网络缓解能量稀缺问题。由于射频信号中往往也含有其他用户的信息，因此能量采集系统面临着严重的信息安全威胁。本项目拟研究基于射频能量采集的物理层安全传输技术。具体包括：（1）对能量采集系统中的窃听信道建模并深入分析其安全性能与系统参数的关系；（2）将多天线技术与人工噪声、波束成形等技术相结合，发展安全、高能效的信号发射方案；（3）利用多中继协作传输对抗远近效应，探索自适应中继选择策略与高安全协作传输协议；（4）综合利用系统参数实现时间、功率等资源的动态配置。本项目的研究可降低能量采集系统的信息泄露风险，对于推动能量采集技术与物理层安全技术的实际应用具有重要意义。

RF energy harvesting (EH) is an emerging technique to solve energy scarcity problem for energy-constrained devices, which extract energy from RF signals. However, the received RF signals at energy receivers contain messages for information receivers, which leads to serious information leakage in EH systems. This project aims to combat eavesdropping in EH systems through physical-layer security (PLS). The following research contents are included..Firstly, the wiretap channel model of EH systems will be intensively studied, based on which, the relationship between security performance and system parameters will be analyzed..Secondly, this project will further explore the combination of multi-antenna, artificial noise and beamforming techniques to develop secure and energy-efficient signal transmitting schemes..Thirdly, to combat near-far problem, multi-relay cooperative transmission will be exploited with a dynamic relay selection strategy and a secure cooperation protocol..Moreover, dynamic resource allocation such as time and power will be intensively investigated through comprehensive utilization of system parameters..The research of this project will reduce the information leakage of EH systems, and provide important significance on promoting the practical application of EH and PLS.