多天线无线携能通信系统中的物理层安全传输技术研究

The simultaneous wireless information and power transfer (SWIPT) system achieves the simultaneous transmission of information and energy. However, due to the broadcast characteristic of the radio signal, the SWIPT system has the security problem of information leaking and being eavesdropped. Based on the realistic demand of wireless power transfer and wireless information transfer efficiently and safely, we apply the physical layer security in the SWIPT communication system in this project. Different with the traditional multi-antenna systems, the architecture of the SWIPT system is complicated and the goals of the power transfer and secure information transfer are inconsistent, which bring a great challenge to the study of the physical layer security. In this project, we focus on three aspects: the first is the research on the low-complexity design for the problem of high complexity of the joint optimization of information security and energy harvesting; the second is the study on the robust design to adapt the channel state information for the problem of imperfect channel state information at the transmitter; the third is the research on the algorithm of efficient node selection and signal design in the case of cooperative transmission. The results of this project will certainly play an important role in the future SWIPT security application.

无线携能通信系统实现了信息和能量的同时传输，然而无线电信号的广播特性使其存在着信息泄露及被窃听的安全隐患。基于能量无线传输和信息高效、安全传输的现实需求，本项目将物理层安全技术引入到无线携能通信中。与传统多天线系统不同，无线携能通信系统架构复杂，能量传输和信息安全传输的目标不一致，这给物理层安全研究带来了巨大的挑战。本项目着重研究三个方面的问题：一是针对信息安全与能量采集联合优化计算复杂度高的问题，研究低复杂度设计算法；二是针对发送者的信道状态信息不理想的问题，研究适配信道状态信息的鲁棒设计算法；三是针对网络节点协同传输的情形，研究有效的节点选择与信号设计算法。本项目的研究成果将在未来的无线携能通信安全应用中发挥重要作用。

项目在建立多天线无线携能通信系统模型的基础上，分析了无线能量传输和信息安全传输的性能。针对信息安全与能量采集联合优化计算复杂度高的问题，设计了多输入单输出多用户窃听信道下面向信干噪比平衡的低复杂度发送波束成形算法，提出了基于人工噪声的安全波束成形与功率分割设计的无线携能传输方法，并研究了非正交多址技术下的多用户间干扰问题。针对发送者的信道状态信息不理想的问题，建立了信道误差模型，并基于该模型设计了鲁棒的联合波束成形和功率分割优化算法。针对网络节点协同传输的情形，提出了双向中继广播系统中编码转发策略下带宽高效的联合信道编码调制方法。本项目的研究成果在无线能量传输和信息安全传输的应用中将发挥重要作用，在民用和军事领域具有非常广阔的应用前景。