Декодування та реалізація алгоритму BCJR для турбокоду, стандартизованого в DVB-RCS

Abstract

Considered problems, associated with modern methods of turbo-coding, promising for use in satellite networks, digital television, mobile communications. Proposed the using of generalized structure with AWGN. Displaying advantages and disadvantages of turbo codes, some principles for work with turbo codes in the satellite standard DVB-RCS and 3G networks. Considered the algorithm BCJR for Markov sources of information, that is transmitted discrete channel without memory with AWGN. Obtained a generalized expression for calculating the LLR in the MAPdecoding BCJR algorithm using probabilistic researches and energy characteristics of the transmission of information. Displaying ideas of MAP-decoder in the technique of using the computing power of technical means and proved the optimality of the algorithm.