Blind Recognition of Turbo Code Encoder Based on Conformity of Parity-check Equation
ZHANG Limin① WU Zhaojun② ZHONG Zhaogen②
①(Institute of Information Fusion, Naval Aeronautical and Astronautical University, Yantai 264001, China) ②(Department of Electronic and Information Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China)
Abstract：In order to solve the defects of poor error tolerance and large calculation amount in current Turbo-code encoder recognition algorithms, a new algorithm based on conformity of parity-check equation is proposed. Firstly, according to small code constraint length, the coding polynomial database is built, then each polynomial of average conformity of parity-check equation is calculated by traversing the database, as a result, the Turbo-code encoder can be realized, because the correct polynomial can make the conformity maximum. The algorithm has small amount of calculation because of finite traversal, which is only related to amount of intercepted data, besides, this algorithm has good error tolerance by soft decisions. The simulation results show that the correct ratio of recognition can reach 90% at SNR of 0 dB by the 10 intercepted code blocks, and the length of each block is 100.
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