Abstract: A blind recognition method of self-synchronized scrambler is proposed for the case that self-synchronized scrambler input sequence is RS code. Firstly, equivalent block code length of the RS code is recognized through scrambler sequence. Then, the extracted scrambler sequence is obtained by using possible polynomial of the scrambler. Based on the different linear constraint between the results of correct and wrong sequence extracting, the polynomial of the scrambler is determined by a new entropy difference of zero elements after matrix elementary transformation. Simulation results show the effectiveness of the blind recognition method of the self-synchronized scrambler after the Reed-Solomon code.

Key words: self-synchronized scrambler, Reed-Solomon code, blind recognition, linear constraint, entropy function

摘要： 针对自同步扰码器的输入序列为RS码的情况，提出一种自同步扰码的盲识别算法。该方法先通过扰码序列识别出RS码的等价分组码长，再遍历可能的多项式对扰码序列进行抽取，根据正确抽取和错误抽取时输出序列的线性约束的差异，对识别矩阵进行初等变换，引入一种新的零元素熵函数差值来识别扰码器的生成多项式。仿真验证了该算法可以对RS码的自同步扰码进行有效的盲识别。

关键词: 自同步扰码, RS码, 盲识别, 线性约束, 熵函数