The security rate optimization problem of a multi-antenna decode-and-forward full-duplex relay system powered by simultaneous wireless information and power transfer is studied. A system model and secure transmission scheme based on energy cooperation and cooperative jamming are presented. The full-duplex relay node works in a power splitting mode for energy collection and information decoding. Artificial noise is injected when the relay forwards the information signals for cooperative jamming. As the relay is equipped with multi-antenna, beamforming technology is used to improve the signal-to-noise ratio of the destination node by adjusting the antenna array matrix. To maximize the security rate, and with consideration to energy cooperation and cooperative jamming performance, the optimal values of the energy collection factor and the cooperative jamming power allocation factor are obtained and the calculation process is also given. The simulation results show that the proposed secure transmission scheme can effectively improve the security rate of the system.

研究了同时进行无线信息和功率传输的多天线解码转发全双工中继系统的安全率优化问题。提出了一种基于能量协作和协同干扰的系统模型和安全传输方案。全双工中继节点以功率分配模式工作，以进行能量收集和信息解码。当继电器转发信息信号以进行协同干扰时，会注入人为噪声。由于中继器配备了多天线，因此波束成形技术用于通过调整天线阵列矩阵来提高目标节点的信噪比。为了最大程度地提高安全性，并考虑到能源合作和协同干扰性能，得到了能量收集因子和协同干扰功率分配因子的最优值，并给出了计算过程。仿真结果表明，所提出的安全传输方案可以有效提高系统的安全率。