| Intelligent Reflective Surface(IRS),as an emerging paradigm for the future 6th Generation wireless communication,has received much attention in the past two years for its features to reconfigure the wireless communication transmission environment.IRS can effectively enhance the data transmission rate of spatial modulation systems,and in the age of information,where the volume of data is exploding,there is a growing concern for communications and the IRS-enabled physical layer security can improve communications security while reducing energy consumption.This paper studies the application of IRS in the single-input single-output(SISO)secure transmission and uplink secure spatial modulation are investigated.The main elements of which can be described as follows:1、To address the problems of IRS enabled SISO systems with limited space freedom at the transmitting side of a single antenna,the unavailability of multi-antenna secure beamforming techniques.This paper focuses on the full-scene eavesdropping threat to IRS enabled SISO transmission systems and respectively proposes two secure transmission schemes based on random vector synthesis(RVS)and random perturbation alignment(RPA),to achieve secure transmission of confidential signals.Under the Gaussian input condition,this paper analyzes and evaluates the achievable security performance of the IRS enabled SISO secure transmission system,and analyzes the achievable security rate and secrecy outage probability of the RVS-IRS-SISO and RPA-IRS-SISO systems with different implementation complexities of IRS reflection schemes,respectively,for the worst-case and ideal eavesdropping models of whether there is a transmission connection between the IRS and the eavesdropping side.2、For the IRS enabled uplink communication system under finite alphabet input,there is a risk of user information theft by user relying only on single antenna to transmit signals.In this paper,two IRS uplink secure spatial modulation strategies are proposed respectively:First,for the user side to transmit the signal to be synthesized,and the IRS side to form a reflection pattern at the designated antenna at the base station side based on the vector synthesis principle.Secondly,the IRS enabled multipath signal pre-phase alignment and resynthesis criterion enables highly reliable demodulation of baseband and space bits at the base station side.IRS reflection schemes with different implementation complexities are designed for both strategies.The maximum-likelihood detection(MLD)algorithm and a sub-optimal detection(SOD)algorithm are introduced in this paper,to meet the different requirements of detection performance and detection complexity.In this paper,we consider the ideal situation that the perfect channel state information is obtained at the base station side,the reflection scheme for independent array design is selected for IRS,and the maximum likelihood detection is used for the received signal detection,and the achievable average bit error rate performance of the base station side and the eavesdropping side is studied and analyzed under different eavesdropping scenarios,as well as their discrete-input continuous-output memoryless channel(DCMC)capacity performance,and the general equation of bit error rate and DCMC capacity performance based on the moment generating function method. |
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