Researeh Of Channel Coding Analysis And Recognition

Channel coding analysis and recognition is the key technology in communicationreconnaissance. This article focuses on the analytical method of coding parameter forthe typical convolution code, linear block code and interleaved code under the conditionthat only code data is available with the coding parameter being unknown to us.In this paper, the common channel codes are classified in accordance with thedifferent coding characteristics. The coding theory of convolution code, linear blockcode and interleaved code is described respectively in the article. And also themathematical relationship among different coding parameters can be received.According to the conclusion of coding characteristic analysis, the analytical recognitionmethod of coding for hamming code, general cyclic code, linear block code of RS code,convolutional code and punctured convolutional code is proved. The start and length ofblock codes can be obtained by studing the characters of coded data and the frame inengineering practice.Primitive polynomial in symbol domain and generator polynomialof RS code can be calculated directly by utilizing matrix transformation method, thusimproving the adaptive ability of parameter analytical algorithm for RS code. Theanalytical method of parity-check matrix for punctured convolutional code whose bitrate is half of the original bit’s is proposed, through studying the relationship betweenpunctured convolutional codes and un-punctured convolutional code.By analysis on the coding characteristics about the matrix interleave of block code,the matrix interleave of convolutional code, the convolution interleave of block codeand pseudo-random interleave of convolution code, which are common structure inengineering, this article considers channel code and staggered code as a whole. Variousjoint code analytical method are proposed for various combined coding and theparameters of channel code and convolutional code can be determined. Case analysisconfirms the feasibility of this method.The technology of channel coding analysis and recognition has been applied in theproject.A offline code stream analysis software was developed which achieved analysisand recognition algorithms of the convolutional code,binary block code,RS code andinterleave code.