Research On Multiple-Antenna Transmission Technology For Physical Layer Security

With the continuous growth of demand for high-speed data applications,higher requirements for transmission performance and spectrum efficiency of wireless communication have been raised.In response to this challenge,various wireless transmission technologies,such as multiple-antenna technology,multi-carrier technology,and Faster than Nyquist(FTN)technology,have been extensively researched and applied.However,while pursuing high-speed transmission performance,the openness and mobility of wireless communication has brought various security risks,making information security increasingly prominent and cannot be ignored.This thesis focuses on the research of physical layer security technologies in multiple-antenna systems utilizing multi-carrier and FTN technologies,and verifies the feasibility of the multipleantenna physical layer secure transmission system using a hardware testing platform.The main research contents of this thesis are as follows:Firstly,this thesis investigates the method of implementing artificial noise in a multicarrier system and compares the performance under different power allocation schemes through simulation,demonstrating the feasibility of secure transmission using artificial noise in multi-carrier systems.Furthermore,the issue of peak-to-average power ratio(PAPR)in multi-carrier systems with artificial noise is further discussed,and an improved method combining the characteristics of artificial noise is proposed based on traditional methods,which shows its advantages through simulation results.Secondly,this thesis studies FTN transmission technology,introduces the basic principle of FTN technology and its advantages in transmission capacity and spectrum efficiency.Regarding the security transmission issue in the FTN system,this thesis focuses on two methods.On the one hand,the feasibility of applying artificial noise in the FTN system is evaluated.On the other hand,the method of utilizing the interference introduced by FTN time-domain compression to resist eavesdropping is explored.Finally,the security performance of these two methods in FTN system is verified through simulations.Lastly,this thesis presents the implementation of a multiple-antenna transmission system for physical layer security on a hardware platform and provides the measured results of the system through joint simulation of software and hardware.The feasibility of the multiple-antenna secure transmission scheme in practical scenarios is demonstrated by comparing the results of computer simulations with those of hardware testing.