Decoding Method Based on Metric Value of Simplified Dual Binary Turbo Codes

Abstract

The invention discloses a decoding method based on a simplified double-binary Turbo code metric value, mainly aiming at solving the problem that an existing decoding method is high in complexity and low in efficiency. The decoding method comprises the following steps: receiving data; performing initialization; setting the number of decoding iterations; calculating a backward metric value of the first half round of iteration; calculating posterior information and extrinsic information of the first half round of iteration; acquiring prior information of the second half round of iteration; calculating a backward metric value of the second half round of iteration; calculating posterior information and extrinsic information of the second half round of iteration; acquiring prior information of the first half round of iteration; performing decoding termination judgement; and judging log-likelihood ratio information. According to the decoding method disclosed by the invention, the same part among different branch metric expressions is only calculated for once, a forward metric intermediate value and a backward metric intermediate value are firstly compared and secondly solved, and thus the calculation amount of decoding can be reduced, the complexity of decoding can be reduced, and the efficiency of decoding can be improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a decoding method based on simplified double binary Turbo code metric values ​​in the technical field of channel coding. The invention can be used for double binary Turbo code decoding. Background technique [0002] As an excellent channel coding scheme, Turbo codes have a performance close to the Shannon limit, and have attracted much attention since they were proposed. However, due to the complexity of the decoding process of Turbo codes and the difficulty in hardware implementation, after more than 20 years of research, only It is widely used in various communication standards. The double binary Turbo code is developed on the basis of the classic Turbo code. It has higher coding efficiency, better error correction performance, and the error level is not obvious. The international digital video broadcast return channel DVB-RCS (Digital Standards such as V...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the intermediate value of the forward metric and the intermediate value of the backward metric are only calculated, but the calculation results are not used, resulting in unnecessary operations, thus increasing the decoding complexity

However, the disadvantage of this method is that in the calculation process of branch metrics, there are repeated calculations, which increases the amount of calculations and causes a waste of resources

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