Generating Chaotic Signal And The Research On Voice Secure Communication Based On FPGA Technology

Chaotic phenomenon appears in the non-linear system. Chaos is determinant, acyclic, convergent, sensitive to initial value and it looks as if random but actually not. Because of these characteristics determines the chaotic signal is particularly applicable to secure communication. And now, it is always reported in referenced literature that many kinds of continuous chaotic system are fulfilled by separate analogy circuit device. But very few of them are researched and realized by modern discrete signal process method.At first, we have introduced the background and the significance of our research work in chapter 1, and then we have explained the basic concept of chaos and secure communication in chapter 2. As described in this paper is the new method of generating Lorenz chaotic signals and applying in voice secure communication based on FPGA technology, it is necessary to introduce the concept of FPGA and the software development tools in chapter3, which FPGA design requires. Finally, based on the in-depth investigation of relational datum, this paper presents a new way how to generating the Lorenz chaotic signal and achieve voice secure communication on the FPGA platform in last two chapters.It is well known that modern discrete signal process technology aims at discrete system. However,the chaostic system is continuous anolog system.The first,it will generate Lorenz chaostic signal.Because the aim of the issue is to use FPGA technology to generate Lorenz chaostic signal and come ture the voice secure communication.it's important to propose an appropriate discrete and variable proportion transformation to convert the continuous chaotic systems into discrete chaotic systems, which is appropriate for FPGA processing. According to this math transformation, we take the Lorenz chaotic system as an example to explain how to generate Lorenz chaostic signal and realize the voice secure communication by using the FPGA technology that we have mentioned above. The experimental result of chaotic system has been shown in the end of this paper. As the algorithms of generating chaotic signal is the floating-point operations, the use of FPGA technology to generate chaos and chaotic signal signal processing is a new challenge, it is creative to have mentioned the appropriate discrete and variable proportion transformation and realizing floating-point arithmetic using FPGA technology. And based on this theory, we have fulfilled the design of the chaostic voice secure communication by using FPGA.