An important feature of turbo-like codes is the use of iterative decoding. The high computational complexity of the iterative decoding process of the TPC requires optimization of the decoder resources used. A problem arises in that the requirements for the decoder memory volume grow exponentially with the increase in the number of decoding iterations. A general solution to this problem is to optimize the iterative decoding process by reducing the number of iterations. The article proposes the use of adaptive turbo decoder control algorithms that minimize the number of decoding iterations under constraints on the required reliability. The adaptive algorithm is based on the joint use of a specially selected pair of codes with non-overlapping functionality. The key idea is the adaptive use of a part of the information sequence of the TPC to transmit the check symbols of the embedded modified component code. Simulation modeling of the proposed perforated modified component code was carried out, taking into account the specifics of errors occurring during decoding of the TC. The modeling results show greater reliability and less redundancy in the SNR region with a predominance of decoded packets. The solutions proposed in the article allow us to design optimal, from the point of view of the required computing resources, component turbo-like codes with specified reliability characteristics.

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A Method for Adaptive Control of the Process of Decoding Turbo-Like Codes

  • Serhii Liventsev

摘要

An important feature of turbo-like codes is the use of iterative decoding. The high computational complexity of the iterative decoding process of the TPC requires optimization of the decoder resources used. A problem arises in that the requirements for the decoder memory volume grow exponentially with the increase in the number of decoding iterations. A general solution to this problem is to optimize the iterative decoding process by reducing the number of iterations. The article proposes the use of adaptive turbo decoder control algorithms that minimize the number of decoding iterations under constraints on the required reliability. The adaptive algorithm is based on the joint use of a specially selected pair of codes with non-overlapping functionality. The key idea is the adaptive use of a part of the information sequence of the TPC to transmit the check symbols of the embedded modified component code. Simulation modeling of the proposed perforated modified component code was carried out, taking into account the specifics of errors occurring during decoding of the TC. The modeling results show greater reliability and less redundancy in the SNR region with a predominance of decoded packets. The solutions proposed in the article allow us to design optimal, from the point of view of the required computing resources, component turbo-like codes with specified reliability characteristics.