摘要
提出一种基于Tent映射的双向耦合映象格子和改进型不变分布阈值量化方法相结合的直扩码设计方法。为实时产生直扩码,提出通过预设最优映射参数和序列选取方式的优选方法。仿真表明,经改进型不变分布阈值量化方法得到的混沌序列在其他性能不降低的情况下,平衡性得到了提高,且映射的利用率也较高,实时优选出的直扩码的各项性能得到了进一步的提高。
A design for generating DS code,combining the modified quantitative method of the invariant distribution threshold and double-way coupled map lattice based on Tent map,is presented.In order to generate DS code in real-time,an optimal method by presetting the best map parameters and the mode of sequence selection is proposed.Simulation results prove that,the balance of TDCML serials based on the modified method mentioned above is improved while other performances do not decrease,and the utilization percent of TDCML-map is higher.The performance of optimal DS codes selected in real-time has been further improved.
出处
《重庆邮电大学学报（自然科学版）》
北大核心
2012年第2期201-207,共7页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
关键词
直扩码(DS
code)
不变分布
量化
优选
direct spectrum code（DS code）
invariant distribution
quantification
optimization
