Research Of Chaotic Multiple Access Communication System Based On Quantum Computing Method

With the continuous developm ent of chao s theory,it is applied in classical communication gradually,so many new digital communication based on chaos has been created.Due to the chaotic signal has the unique advantages,which make it become the indispensable part in the current communi cation field,and one of the im portant application is multiple access communication.On the bas is of exis ting research,this paper proposes two new chaotic multiple a ccess communication sys tems,which are based on the keying technology and chaotic spr ead spectrum.On the receiving end of the two kinds of system,the multiuser detection algorithms are designed for them in this paper,but they have the calculation pr oblem,so the Grover quantum detection algorithm is utilized to resolve it.At last,th e feasibility and advantages of the proposed project s are analyzed.Firstly,the definition,characteristic,and statistical properties of chaotic system are introduced;the common mappings that generating discrete chaotic sequ ence and their characteristics analysis are stud ied.What's more,the basic theory of quantu m information related to this ar ticle is studied,introducing th e state space and expression method of quantum bit,and the single bit quantum logic gates and multiple bits quantum logic gates that re alize the quantum compute are introduced,and the quantum register is also introduced.Once more,the chaos communication systems based on shift keying are discussed,and two kinds of m ultiple access systems putting forward by Lau are desc ribed: multiple access chaos shift keying(MA-CSK)system and multiple a ccess differential chaos shift keying(MA-DCSK)system,and the search process of Grover quantum algorithm is introduced.Under the hypothesi s that the comm unication system i s synchronous,proposing two kinds o f chaotic multiple access comm unication system based on the Grover quantum method,the systems are multi-bit multiple access DCSK(multi-bit MA-DCSK)and var iable delay multiple access CDSK(VDMA-CDSK)communication systems.On the receiving en d of two system s,multi-user dete ction algorithm is designed to reduce the multi-user interference problem.Matlab re sult shows that the two system s have lower bit e rror rate performance,that is to say,two kinds of th e system scheme are feasible,and the m ulti-user detection algorithm proposed in this paper is effective.F or computational complexity problem,the Grover quantum algorithm is used to solve it.