一种数字化混沌扩频序列发生器的设计
Design for a digital chaotic spreading sequence generator
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摘要: 该文给出了一种基于FPGA芯片的数字化分段线性混沌映射系统的设计方法,该方法利用了m序列的扰动来克服有限精度下混沌序列的短周期行为;对用 VHDL实现的分段线性混沌序列发生器进行了门级仿真;将数字混沌序列的平衡性、相关性和线性复杂度等与实值混沌序列进行了比较,结论为:数字混沌序列的平衡性略比实值混沌序列差;自相关特性略好;N=63,255时,互相关特性略好,而N=31,127时互相关特性略差;二者的线性复杂度相当,为分段线性映射系统应用于扩频通信领域探索了一条途径。Abstract: The design method is given for the digital piecewise linear mapping system based on FPGA chip. In this method, the perturbation of m-sequence is used to overcome the short period of chaotic sequence caused by the finite precision effect. The piecewise linear chaotic generator is realized by means of VHDL and the simulations are made. The balance, the correlation and the linear complexity are compared between digital chaotic sequence and analogue chaotic sequence. A road is explored to apply the piecewise linear mapping system to a practical spreading spectrum system.
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