The invention discloses a totally blind recognition method for a coding parameter of a
convolutional code, which mainly solves the problems of incapability of realizing totally blind recognition and high calculation complexity existing in the prior art. The technical scheme provided by the invention is that: (1) the code length n, the input information
bit length k and the register length m are solved according to the mutual check relationship between a
convolutional code coder and an information
code word; (2) when the
code rate k / n is 1 / n, two adjacent bits of the
code word in the
convolutional code bit
stream are taken in sequence to construct an analysis matrix C, and fast Walsh-Hadamard transformation is used for the analysis matrix C to solve a
generator matrix G; and (3) when the
code rate k / n is (n-1) / n, the first to (n+1)th bits of the
code word in the convolutional code bit
stream are taken to construct an analysis matrix C, and fast Walsh-Hadamard transformation is used for the analysis matrix G to solve a basic check matrix H; and thus, the totally blind recognition for the coding parameter of the convolutional code is finished. According to the totally blind recognition method, the problem of totally blind recognition for the coding parameter of the convolutional code under the conditions of knowing no priori knowledge and containing an error code are solved well, and the operation complexity is simplified; and the totally blind recognition method can be used for multi-cast communication and intelligent communication.