基于SWIPT多中继网络物理层安全传输性能研究

Secrecy transmission performance on physical layer in multi⁃relay networks based on SWIPT

针对能量受限多中继网络的物理层安全中断性能问题,提出了基于无线携能通信(Simultaneous Wireless Information and Power Transfer,SWIPT)的多中继网络物理层安全传输方案。该方案在中继节点处采用中继选择策略以及混合功率和时间分割协议来实现网络安全速率最大化。对于提出的网络安全中断性能问题,首先计算出任意链路的安全中断概率闭合表达式,然后利用瑞利衰落信道的独立性和高斯切比雪夫等式,推导出了网络安全中断概率闭合表达式。为了进一步分析理论结果,推导出了在高发射功率下的网络安全中断概率闭合表达式。仿真结果验证了理论分析的正确性。仿真结果表明,增加网络中继节点数量可以显著地降低网络安全中断概率。与功率分割协议和时间切换协议相比,低发射功率下采用混合功率分割和时间转换协议能有效地提高网络安全中断性能。

A physical layer secrecy transmission scheme based on simultaneous wireless information and power transfer(SWIPT)to assist an energy⁃limited network is proposed to deal with the physical layer secrecy outage performance problems in the multi⁃relay networks.In this scheme,a relay selection strategy and the hybridized power⁃time splitting protocol are adopted to maximize the network secrecy rate at the relay nodes.For the proposed secrecy outage performance problem in the network,a closed⁃expression of the secrecy outage probability of any link is calculated firstly,and then using the Rayleigh fading channel independence and Gaussian⁃Chebyshev quadrature to derive the closed⁃expression of the network secrecy outage probability in the network.To further analyze the theoretical results,the closed⁃expression of the network secrecy outage probability is derived under the high transmit power.Simulation results verify the correctness of the theoretical analysis and show that increasing the amount of relaying node can significantly reduce network secrecy outage probability.Compared with power⁃splitting and time⁃switching protocols,under the low transmit power,using the hybridized power⁃time splitting protocol can effectively improve the performance of the network secrecy outage.