METHOD FOR BLINDLY DETECTING THE DIGITAL DATA CODING MODE

摘要

The invention relates to a method of blind detection of the mode of encoding digital data. The data being transmitted in frames of n bits, partially subjected to a convolutional coding, one computes (1000) on a series of bits a value of flexible syndrome representative of the probability of transmission error of these bits, then from the mean m and the sigma standard deviation of the distribution of absolute values of soft syndrome, a likelihood value V (alpha,) ( 1001), alpha, denoting the number of coded bits respectively uncoded. A maximization (1002) of the likelihood value V (alpha,) as a function of alpha or allows (1003) to discriminate the coding mode from the a or corresponding values. Application to the optimization of the coding of digital signals. / P