Energy harvesting (EH) is introduced into the physical layer security transmission of wireless sensor networks. It takes the energy efficiency and security into account simultaneously. To improve the physical layer security of the cooperative wireless sensor network, an EH-based physical layer security transmission scheme called multi-relay time switching (MRTS) is proposed in this paper. In the multi-source single-destination network with eavesdroppers, multiple relay nodes with time switching (TS) protocol convert the received signals into energy and information according to the time slots, and the converted energy is used to amplify and forward the received information. The research shows the optimal time switching ratio, under which the maximum secrecy capacity is achievable with the optimal converted energy. The results prove that under the same conditions, the secure transmission scheme based on MRTS is better than power splitting-based relaying (PSR) scheme when the total power of sources is limited.

能量收集（EH）被引入无线传感器网络的物理层安全传输中。它同时考虑了能源效率和安全性。为了提高协同无线传感器网络的物理层安全性，提出了一种基于EH的物理层安全传输方案，称为多中继时间交换（MRTS）。在具有窃听器的多源单目的地网络中，具有时间切换（TS）协议的多个中继节点根据时隙将接收到的信号转换为能量和信息，并且转换后的能量用于放大和转发接收到的信息。研究表明了最佳的时间切换比率，在该比率下，利用最佳的转换能量可以实现最大的保密容量。