两种混沌扩频序列平衡性分析

利用Logistic，Tent映射产生直扩码分多址系统的二相混沌扩频序列，给出了平衡性定义，讨论了与平衡性有关的参数，深入分析了平衡性与分形参数、初始值、序列周期的关系，并且对2种混沌序列进行了比较，通过仿真实验提出了混沌序列用于码分多址系统时应避开的不平衡点；并说明了混沌扩频序列具有良好的平衡性，当取序列周期在1000以上时，可满足直扩码分多址系统对平衡性的要求．

Analysis of balance of chaotic spreading spectrum sequences based on logistic-map and tent-map

Chaotic spectrum spreading sequences of 2-phasc for CDMA system is built up by using Logistic and Tent-mapping, the definition of performance balance is given,the parameters related to performance of balance is discussed,and the relation between the performance balance of the sequence and fractal parameter, initial value, the period of the sequence are analysed thoroughly. Then comparison of the two kinds of chaos sequences is made. The author points out that non-balanced spot ought to be avoided in application of CDMA system. And the better sequence performance of balance is achieved through simulation, which can meet the demand for CDMA system when sequence length is over 1000.