The Studies Of Chaotic Sequences In Spread Spectrum Communication

Chaos is one of the contents nonlinear science research. For a long time, because the chaos system has extreme complexity, people have considered the chaotic system is uncontrollable, let alone to using chaotic system. But because of the rapid development of electronic technology, especially the development of computer technology, only in short decades, Chaotic learning is throughout the chaos theory, and in practice it obtains fast development, now with communication technology of rapid development, when communicating already no longer a problem, people will look gradually turn to information security aspects, namely, when the information is transmitted from one to another, how to prevent information be wiretapped, be intercepted, so as to ensure the security of information, especially in military communication is very important, accordingly, the traditional security communication already cannot satisfy people with increasingly rapid increase in demand, the safety of information need to be more reliable secure communication system, which guarantee them.In traditional spread spectrum communication, traditional spread spectrum yards by increasing the length of its sequence or mixing each other to improve the security of the system , but it also brought a series of problems, such as the complexity of the system and the feasibility of actual system etc. And this article, based on spread spectrum communication, we abandon traditional spread spectrum yards generated theory, using the characteristics of chaos phenomena, through the chaos mapping to produce a new sequence -- chaos sequence, instead of traditional spread spectrum code (such as m sequence, the Gold sequence). And through experiment analysis and contrast, we found this new spread-spectrum yards than traditional spread spectrum code has better relevant features.Because the traditional spread spectrum yards sequence in its length and amount are limited, so, this paper is using chaos initial value sensitivity of system, and its relevant features, with MATLAB software and DSP simulation, through the chaos mapping generation chaotic sequences, which is instead of traditional pseudo random sequence as spread spectrum yards, and simulate the spread spectrum communication system, so as to prove the feasibility and superiority of the chaotic sequence.