| Whether in military communication or civil communication, channel coding is needed to resist noise and interference. When we need to know the transmit information without coded parameters --such as information intercepting, intelligent communication etc, channel coding recognition is needed. As common channel coding method, convolutional code is widely used in military and civil communications.This article mainly focuses on the research of the blind recognition of convolutional code in channel coding, aimed to establish of a complete convolutional code recognition process, the main contents of this article are shown as follows:Firstly,we aim at the problem that the existing generator polynomial matrix estimation methods require a known coding rate and other parameters, analysis the relevance of convolutional codes, considering the code length of convolutional code is small, build data matrix and exhaustively search for rank to estimate the coding rate; simplified data matrix get node synchronous position and check polynomial matrix.Then we analyse the existing generator polynomial matrix estimation methods, the simulation is made among various algorithms. For 1/ n0 rate convolutional code, we chose syzygy algorithm, the method has fault-tolerant ability and we find that the method has the ability to synchronize the node, also promotes this method from rate 1/2 to rate 1/ n0 ; on ( n0-1) /n0 rate punctured convolutional code, we use the relationship of check polynomial matrix and generator polynomial matrix to estimation.Finally, based on the estimation of block interleaver which serial connected with block code , we analyse block interleaver serial connected with convolutional code.Unlike previous single parameter estimation, this paper studies the complete convolutional code recognition process and simulation performance. The measured data ber is often about 10?3 after demodulated in communication, in this paper, we identify several representative convolutional code under 10-3 ber. |
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