Research On Blind Recognition Algorithms Of Turbo Coding Interleaver

In the field of non-cooperative communication,it is necessary for receivers to analyze the type of channel code of bit stream sended by transmitter,and in turn,receivers could use these information to decode the bit stream.In recent years,Turbo code is widely used for many kinds of communication protocols,however,there are many technology problems to solve in the field of Turbo code blind recognition.The main work of this article is to research blind recognition of Turbo code,the detailed contents are divided into the following two parts.The first part emphasizes on the recognition technology on interleaver of Turbo code.This part firstly tells the theory of Cote algorithm and Cluzeau algorithm and gives the complexity analysis for those two algorithm.Then,it present a new recognition method which uses soft bit stream in the basis of the Cote algorithm.Experiment result shows that this new algorithm is significantly improved compared with Cluzeau algorithm in calculation complexity and ability for overcome error bit rate,especially in the low SNR environment.The second part of this article firstly makes detail analysis on GNU Radio platform including transmitter and receiver.Then,two modules including blind recognition of Turbo code interleaver and soft-decision demodulation are newly coded in the basis of GNU Radio.Finally,combining with the hardware USRP,it would do the experiment for the proposed new algorithm to give the feasibility of realization for algorithm in real environment.