Research Of Spread Spectrum Communication System Based On Chaos

With the arrival of the era of big data and cloud storage,communication users are more and more concerned about the security of information.Spread spectrum communication is a classical topic in the research of communication technology because of its good anti noise and security.Chaos is a seemingly random and deterministic process in nonlinear dynamical systems.The natural properties of Chaos system can produce spread spectrum codes easily because of its' natural properties,so it is widely used in the spread spectrum communication.Synchronization is not only a hot issue in the study of chaos,but also plays a vital role in the spread spectrum communication system.In this paper,a new chaotic synchronization spread spectrum communication system has been proposed,which is based on the combination of spread spectrum communication and synchronization of chaos.The main contents of this paper include the following three parts:Chaotic synchronization spread spectrum communication system has been established.Chaotic system has been used to guarantee the synchronization between the receiver and the transmitter of the spread spectrum communication system.The spread spectrum code with better performance has been produced by using using chaotic system.Firstly,the synchronization of chaotic system is realized by using feedback synchronization method.Secondly,the analog signal generated by the chaotic system is quantized into a digital baseband signal,and generates a spreading code and despreading code.Then the simulation model of the single user chaotic synchronization spread spectrum communication system is built,and the parameters of each module are set up.Finally,the error performance of the chaotic synchronization spread spectrum communication system has been analyzed.An improved multi-user chaotic synchronization spread spectrum communication system has been proposed based on the multi-user chaotic synchronous spread spectrum communication system.On the basis of the theory of multi user spread spectrum communication system,the single user chaotic spread spectrum communication system is extended to a multi user chaotic synchronization spread spectrum communication system.The error bit rate of the system is analyzed,and according to the characteristics of chaotic synchronization system,an improved multi-user chaotic synchronization spread spectrum communication system is proposed to improve the operating efficiency of the multi-user system.A super chaotic synchronization spread spectrum communication system has been established.Firstly,the synchronization of hyper chaotic system is realized by using feedback synchronization method.Then build the model of multi-user chaotic synchronization spread spectrum communication system.Finally,the error bit rate of the system is analyzed,and a comparison is made on the chaotic synchronization spread spectrum communication system and the hyper chaotic spread spectrum communication system.