基于归一化秩特征的交织类型盲识别
Blind Identification of Interleaver Type Based on Normalized Rank Characteristics

在非合作通信中，交织类型识别是进行交织参数识别的前提。针对现有类型识别算法受码长约束且抗误码性能较差的问题，提出了一种适用于RS码的基于归一化秩特征的交织类型盲识别算法，在不需要考虑码长约束的条件下，通过高斯约当消元法对分析矩阵做初等变换，结合所得下三角阵中各列的零值比计算出秩缺矩阵的归一化秩，最后利用分组交织和卷积交织的归一化秩变化规律完成交织器类型盲识别。仿真实验结果表明，本文所提方法可以较好地完成交织类型识别，且具有良好的抗误码性能，运算量较小，可为实际的工程应用提供一些参考。
The identification of interleaver type is the precondition for the identification of interleaver parameters in non-cooperative communication. A blind identification algorithm of interleaver type based on normalized rank characteristics for RS code is proposed. Unlike the prior works, the interleaver type identification process is carried out for a generic case without any restriction on the codeword length n. Combining the ratio of number of zeros in the column with Gauss-Jordan elimination through pivoting algorithm, the normalized rank can be determined in the presence of bit errors. Finally, the blind identification can be realized through the differences of the normalized rank between block interleaver and convolutional interleaver. Experimental results show that this proposed method can achieve a better performance compared with the existing algorithms in high bit error rate and can realize the identification of interleaver type. It has a certain guiding significance for practical engineering applications.