Research On Security Technology Of Space Modulation In Wireless Access Network

With the rapid development of modern society,wireless communication technologies intend to become fast,efficient and safe with a growing popular emphasis and dependence.Future wireless communication network will be deployed and cooperated with multiple network structure and communication technologies.Varieties of wireless communication business require that high speed,high capacity and good security are fundamental for wireless communication network.Multiple Input Multiple Output(MIMO)wireless communication system can combine transmit diversity with reception diversity technique simultaneously,which greatly improves the anti-fading performance and system capacity.What's more,the research of user data protection has been paid much attention in the area of physical layer security based on the information theory.The basic idea is to add artificial noise to transmitter information to interferer eavesdroppers and destroy malicious eavesdropping channel,making it impossible for eavesdroppers to intercept signals sent to the legitimate user,or increases the difficulty of interception,which can guarantee the information security of legitimate user.The paper researches on secure transmission problems of MIMO communication system based on based on spatial modulation in future radio access network.Common MIMO modulation techniques include spatial modulation(SM),spatial shift keying(SSK),generalized spatial shift keying(GSSK)and distributed spatial modulation(DSM).In the paper,performance of MIMO communication system based on various spatial modulation techniques are analyzed from the perspective of security capacity.First of all,research background and research significance are analyzed,then the overall work and structure of the paper are introduced.On basis of introduction of various MIMO modulation techniques,emphasis is placed on SM,SSK,GSSK,DSM,and collaborative security technology.Innovative improvement is implemented based on the above techniques,and thus MIMO modulation oriented,DSM and collaborative relay based secure transmission scheme are proposed.In the secure transmission scheme based on MIMO modulation technology,a combination of artificial noise and null-space MIMO channel response technique is applied.Security rate and bit error rate of reception node are obtained in consideration of different modulation order,single antenna and multiple antennas for the reception node,and different intensity of interference signal.Moreover,the performance analysis of MIMO communication system is given at the presence of eavesdroppers.The effectiveness and feasibility of MIMO modulation technique based security transmission scheme is evaluated with the objective of security rate and bit error rate.Then secure transmission scheme based on distributed spatial modulation and collaborative relaying is proposed.When there is no direct path between the source and destination node and eavesdroppers exist,replaying nodes are assisted for forwarding signals and jamming nodes are used to transmit an interference signal against eavesdropping in the proposed distributed spatial modulation and collaborative relaying technology,which achieves ultimately secure transmission of signals.A securer and more reliable communications capability are illustrated for the proposed secure transmission scheme based on distributed spatial modulation and collaborative relaying technology,which verify the feasibility and effectiveness of the proposed scheme.