Blind Estimation of Block Interleaver Parameters using Statistical Characteristics

In digital communications systems, interleavers are used to stir bits of channel coded data to robust against burst error in noisy channel. However, in non-cooperative context such as signal intelligence system(SIGINT) and spectrum surveillance systems, interleaver may act as encryptor to 3 party listener who has no information about the interleaver parameters used in transmitter. Therefore, blind estimation of interleaver parameter is necessary in non-cooperative context to reconstruct the original data sequences. In this paper, a blind estimation method is proposed which can blindly estimate interleaving period of block interleaver from block coded and block interleaved data sequence using statistical characteristics.