Research On Key Technologies Of Wireless Communication Security Transmission Based On Spatial Modulation

In the context of the rapid development of 5G and artificial intelligence applications,the amount of wireless communication data has exploded,the power consumption of the information industry has become larger and larger,and many financial transactions and personal privacy information are involved.Therefore,”green and security” is people's expectation and hope for future wireless communication.Spatial Modulation(SM)and Physical Layer Security(PHY Security)are emerging as the focus of their respective fields.SM-based PHY Security technology can inherit the advantages of both and is a powerful candidate for the future,so this article takes this as the main research content,it is summarized as follows:(1)The security performance of the generalized SM system is studied.Based on a detailed analysis of the SM security scheme,an artificial noise cancellation scheme based on generalized spatial modulation is proposed,if the number of active antennas is an even number,artificially designed artificial noise is added to the signal transmitted by each ac-tivated RF chain? if it is an odd number,one of the remaining silent antennas is randomly selected to transmit another artificial interference signal,and these added noises will can-cel each other in the received signals of the legitimate users,so they will not affect the legitimate communication.However,due to the channel independence of the eavesdrop-per,the interference will not be eliminated,resulting in the deterioration of its detection performance and the realization of secure communication.(2)The supplementary research is made on the precoded spatial modulation(PSM)security technology.The antenna selection is introduced into the PHY Security tech-nology,and a precoded spatial modulation scheme with receiving antenna selection with maximum security rate is proposed.It is assumed that the transmitter knows both the le-gal and eavesdropping channel states.In each transmission slot,the transmitter selects a subset of antennas from all antennas of the legal receiver to maximize the security rate for communication transmission.Simulations verify that the proposed scheme can greatly enhance its security performance compared to random selection.(3)Based on the uniqueness of the PSM principle,a secure transmission scheme of joint mapping of spatial domain and symbol domain is designed.In order to make the security system adapt to more severe scenes and have better security performance,taking advantage of the characteristics that the serial number of distributed receiver is difficult to be obtained by the eavesdropper,the selected antenna index is taken as the cyclic rotation factor of the initial modulation constellation symbol,so that the eavesdropper can not accurately reverse rotation the constellation points,thus protecting the information bits in both the spatial and the symbol domain.