5G非正交多址系统中使用全双工基站干扰的安全传输方案

A Secure Transmission Scheme Using Full-Duplex Base Station Jamming in 5G Non-Orthogonal Multiple Access Systems

为了保证5G非正交多址(NOMA)系统中私密信息上行传输过程的信息安全,提出了一种基于全双工基站干扰的物理层安全传输方案。首先,分别使用二项式点过程和泊松点过程,对NOMA上行传输系统中用户设备和窃听者的空间位置分布进行刻画,建立NOMA上行传输系统模型;其次,为了使低硬件复杂度的用户设备付出较小的开销实现安全传输,全双工基站在接收信息的同时发送人工噪声干扰潜在窃听者;最后,基于全双工基站干扰方案,使用随机几何理论对系统的可靠性和安全性进行分析。理论和仿真结果表明:用户设备距离基站越近,全双工基站干扰方案对安全吞吐量的提升越明显;即使对于距基站最远的用户设备,在最优的噪声功率下,该方案仍可以使其安全吞吐量提高约41%。

A secure physical layer transmission scheme using full-duplex base station jamming is proposed to guarantee the information security during the uplink transmission in 5G non-orthogonal multiple access (NOMA) systems. Firstly, the binomial point processes and Poisson point processes are used to characterize the spatial distribution of user equipments and eavesdroppers in a NOMA uplink transmission system, and a NOMA uplink transmission model is established. Then, in order to achieve secure transmission with limited overhead increment by user equipment with low hardware complexity, the base stations not only receive the signals but also keep emitting jamming signals all the time to degrade the performance of any potential eavesdropper. Finally, based on the full-duplex jamming scheme the reliability and security of the system are analyzed using the stochastic geometry theory. Simulation and theoretical results show that the user equipments that are closer to the base station have more security enhancement using the proposed scheme. Even for the user equipment that is farthest from the base station, the proposed scheme can still increase its secrecy throughput by about 41% at the optimal jamming power.