Research On Direct Spread Spectrum Communication Technology Based On Chaotic Sequence Optimization

Chaos is a major discovery in the field of science.The deepening of chaos research makes the application field of chaos continue to expand.Because chaos is an irregular motion phenomenon generated by a deterministic nonlinear dynamic system,its internal randomness and the extreme sensitivity of the initial conditions makes it play a huge role in the field of spread spectrum communication.In the field of spread spectrum communication,direct sequence spread spectrum communication is the key form of spread spectrum communication.and the chaotic sequence is used as the spread spectrum sequence in the DSSS system.Undoubtedly an important research topic.This paper focuses on the in-depth study of chaotic pseudo-random sequences.Firstly,the concept of chaos and the types of chaotic systems are studied firstly,and the basic characteristics of chaos are summarized.The basic theory of spread spectrum communication is also studied,including the principle of spread spectrum communication and the common communication forms of spread spectrum communication.The research on the direct spread communication system is described,and the basic principles of the direct spread communication system and chaotic direct spread communication are expounded.Secondly,the corresponding theory of pseudo-random sequences is introduced,including the concept of pseudo-random sequences and the generation of traditional pseudo-random sequences.The basic composition of typical one-dimensional chaotic systems and multi-dimensional chaotic systems is introduced and the real-valued chaotic sequences are given.The basic method of valued;the basic characteristics of typical one-dimensional chaotic sequences are deeply analyzed,including initial value sensitivity.sequence bifurcation.balance and Lyapunov exponent;the basic concept of chaotic pseudo-random sequence is also given.The chaotic preferred sequences are studied in detail.and three preferred chaotic sequences are proposed by using initial value substitution,parameter control and multiple recombination methods combined with the preferred strategy.The proposed chaotic sequence is tested for pseudo-random sequence performance.The complexity,balance,correlation,run-length and randomness of the proposed chaotic sequence are analyzed.The basic characteristics of the excellent spread-spectrum address code ard obtained.The main simulations analyze the anti-interference ability of the proposed three chaotic sequences.The classification of interference patterns in spread spectrum communication systems is expounded and the typical RF noise interference,noise FM interference and FM comb interference are theoretically studied.The anti-jamming of these three preferred chaotic sequences under the above several interference scenarios is analyzed through simulation.The ability to compare and analyze the anti-interference ability of each chaotic preferred sequence and the traditional spreading code gold sequence in the same interference mode.