用于跳频多址通信的混沌跳频码

跳频码的性能对跳频多址通信起着关键性作用。设计具有良好汉明相关和随机性且数量多的跳频码是非常重要的。本文提出一种利用由混沌映射描述的离散混沌系统设计跳频码的新方法。首先由混沌映射产生混沌时间序列，然后利用量化技术对混沌时间序列进行量化，最后由量化后的混沌时间序列产生伪随机跳频码。为了增大混沌跳频码的周期和非线性复杂度，我们利用多个不同混沌映射组成一个级联混沌映射，并用来设计跳频码。实验表明，混沌跳频码具有非常好的性能。

Chaotic FH Codes for FH-SSMA Communications

The properties of FH codes are critical to the performance of frequency hopping spread spectrum multiple-access communications.It is very important to design enormous FH codes having good Hamming correlations and randomness.This paper presents a new model to design FH codes based on discrete chaotic systems which are defined by chaotic maps.First,a chaotic time series is generated by the chaotic map, then the chaotic time series is quantized using quantization technique,finally, the quantized chaotic time series is turned to a FH code.In order to enhance the nonlinearity and period length,different chaotic maps are combined into a cascaded chaotic map to design FH codes.It is shown through experiments that the chaotic FH codes have excellent properties.