Research And Implementation Of Channel Coding Blind Recognition Algorithm

Channel coding is widely used in modern communication systems,in which error control coding and scrambling are important coding technologies.The blind recognition technology of channel coding is the identification of coding parameters without any prior knowledge,which has important application value in the field of communication.This paper focuses on the blind recognition algorithm of channel coding.The work is as follows:1)Some existing algorithms for blind recognition of channel coding are studied.The performance of some blind recognition algorithms for channel coding,such as binary linear block code,RS code,convolutional code and scrambling,is compared.Especially,the blind recognition algorithms based on linear matrix analysis,the Walsh-Hadamard Transform algorithm for solving error-containing equation,and the algorithm based on OMP for convolutional code recognition are studied,and the MATLAB simulation of those algorithms are completed.Finally the implementation based on TMS320C6678 DSP verifies the correctness of those algorithms on the hardware platform.2)On the basis of algorithm of Galois Field Fourier Transform(GFFT),this paper uses an improved method for blind recognition of RS code.A large amount of computation of GFFT is avoided and the improved method is some robust to bit error rate.3)To solve the self-synchronized scrambler recognition problem in the case of low Signal to Noise Ratio,a blind recognition method through solving error-containing equation based on soft-decision is proposed.In this method,the bit reliability information is obtained from the soft-decision sequence to find the real scrambling polynomial.Simulation results show that this method has a better fault tolerance at low Signal to Noise Ratio,compared to the Walsh-Hadamard Transformation method based on hard-decision.4)A blind recognition method of self-synchronized scrambler is used for the case that self-synchronized scrambler input sequence is RS code.Firstly,equivalent block code length of the RS code is recognized through scrambler sequence.Then,scrambler sequence is extracted by using possible polynomial of the scrambler,the polynomial of the scrambler is determined by a new entropy difference of zero elements.Simulation results show the effectiveness of this blind recognition method.