Turbo码中伪随机交织器盲识别方法

Blind identification of pseudo-random interleaver of Turbo code

Turbo码中所采用的伪随机交织器起到产生随机数据和扰乱信息序列的作用。借助扩频通信中对PN码进行盲识别的二阶循环统计量和分段互相关法,解决在无任何先验知识的情况下,对基于伪随机序列的伪随机交织器进行盲识别。仿真表明,将二阶循环统计量和分段互相关法引入对伪随机交织器进行盲识别,在低信噪比下取得了较好的正确率。

The pseudo-random interleaver in Turbo code is used to produce the random dates and disturb the order of the sequence of the information. Without prior knowledge, the method of second-order cyclie-cumulant and segmented cross-correlation for estimating PN sequence is applied to identify the pseudo-random sequence used in pseudo-random interleaver. Both theoretical analysis and simulations show that this method can get a good estimation in the blind identification of The pseudo-random interleaver even if the intercepted signal is far below the noise.