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我们知道,二元序列有各种性质,对它有各种各样的检验方法。这里介绍的是二元序列通过线性反馈移位寄存器以后的码组频率分布的若干特性。为了便以了解这些特性,我们首先介绍一下全排列统计、频率分布和二元序列本身码组频率分布的一些概念。 1.二元序列的码组频率分布特性熟知,在英语中26个基本字母出现的机会并不均等,显然这是一种概率分布问题。这种分布通常是对字母在英语中出现的频数(也称频率)的大量统计得到的,所以习惯上把这种概率分布称作频率分
We know that binary sequences have a variety of properties and have a variety of test methods for it. Here are some of the features of the frequency distribution of the block after the binary sequence is passed through the linear feedback shift register. In order to understand these characteristics, let us first introduce some of the concepts of full-rank statistics, frequency distribution and frequency distribution of the binary sequence itself. 1. Binary sequence code group frequency distribution characteristics well-known, in English 26 basic letters appear unequal opportunities, it is clear that this is a probability distribution problem. This distribution is usually a large number of letters appear in English frequency (also known as the frequency of) a large number of statistics, it is customary to refer to this probability distribution as frequency points