信息和能量同传全双工中继信道的物理层安全方案

Physical layer security scheme for full-duplex relay channel with SWIPT

给出一种信息和能量同传中继无线信道中的物理层抗窃听安全传输方案。中继工作于全双工模式,采用放大转发方式转发信号,同时采用信息和能量同传模式从所接收到的射频信号中收集能量,并用于信号的转发。目的节点也为全双工节点,在接收信息的同时发送人工噪声去干扰窃听节点的接收。以最大化系统的保密速率为目标,对中继采用功率分裂方式和时间切换方式时的功率分裂因子、能量收集时间比例因子和信号与人工噪声功率分配因子进行优化。由于无法得到关于最优参数的表达式,因此,采用二维搜索方法来对优化问题进行求解。仿真结果表明,功率分裂因子、能量收集时间比例因子、信号与人工噪声功率分配因子的优化和目的端的协作干扰能显著提高系统的性能。

A secure transmission scheme against eavesdropping of physical layer in wireless relay channel with SWIPT(simultaneous wireless information and power transfer)in this paper is given.The relay that uses the amplify-and-forward method to forward the signals works in full-duplex mode,and employs the SWIPT mode to collect energy from the received radio frequency signals which is used for forwarding signals.The destination node which sends artificial noise to interfere with the eavesdropping node while receiving information also works in full-duplex mode.The power splitting factor,the time scaling factor of energy harvesting,the allocation factor between the power of signal and artificial noise are optimized when the relay adopts the power splitting or the time switching mode in order to maximize the secrecy rate of the system.Due to inability to get the expressions about the optimal parameters,a two-dimensional search method is used to solve the problem of optimization.The simulation results show the optimization of the power splitting factor,the time scaling factor of energy harvesting,the allocation factor between the power of signal and artificial noise and the cooperative interference at the destination can significantly improve the performance of system.