Spread-spectrum Sequence Communication System Research Based By Chaotic Theory

By using chaos' very h::.gh complexity and randomness, this thesis studies the theory of chaotic theory in communication and pay attention to the influence of interference in engineering use. This thesis uses chaotic parameters modulation. On one hand this method can encipher information. On the other hand compared with traditional chaotic parameters modulation, this method can transfer information when synchronism precision is low.First of all, directed against that traditional chaotic code generated period peak in correlation because of limited precision, the thesis raises Serial-fabric chaotic code. By changing the second level chaotic system's initial condition, the second level's track will jump randomly. This method can increase the code's period and improves the complexity. At the same time, we find that this Serial-fabric chaotic code have more anti-interference ability than traditional chaotic code.Finally the thesis emulates the chaotic communication system's digital pat. The author uses FPGA to generate chaotic Spread-spectrum Sequence and dispread.