基于改进型不变分布阈值量化方法的直扩码设计及优选

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。

Design and optimal selection of the DS code based on the modified quantitative method of the invariant distribution threshold

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.