一种实用的时空混沌二值化方法

A Practical Method to Transform Spatiotemporal Chaotic Sequences into Binary Sequences

指出经符号函数二值化方法生成的时空混沌序列存在伪随机性差的缺陷 ,提出了一种改进的时空混沌序列二值化方法 ,并应用多种方法对其产生的二值序列的伪随机性能进行了检验。结果显示伪随机性能很好 ,并且二值序列的相关特性也比较理想 ,表明了这种改进的方法是一种实用的时空混沌序列二值化方法 ,而且二值化后的序列比较适合于作为码分多址 (codedivisionmultipleaccess,CDMA)通信系统中的扩频序列。

The traditional way to transform spatiotemporal chaotic sequences into binary sequences is to use sign function, however, the randomness of binary sequences generated by this method is poor. A modified method is proposed in this paper, and the randomness of binary sequences generated by this method is tested in several ways. The results show that the randomness is good, moreover, these sequences have good auto correlation and cross correlation. These facts show that the modified method is a practical way to transform spatiotemporal chaotic sequences into binary sequences, and the binary sequences generated by this method can be used as spread spectrum sequences in a code division multiple access (CDMA) communication system.\;