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International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS)

Research on polar Decoding Method Based on Convolutional Neural Network

MengXue Yan, Zhongdong Wu, Xiang Hui Liu

Published Mar 1, 2021• 2 citations
Publisher

Abstract

In order to overcome the problems of high bit error rate, delay and complexity, research on CNN polar decoding algorithm is proposed. This method uses CNN as the decoder, analyzes the difference between the traditional algorithm and the CNN decoder, adjusts the network parameters, obtains the best parameters, makes the decoder optimal, and in the channel coding scheme, the encoding and decoding complexity of polarized codes is low, and it has been strictly proved that they can reach the Shannon limit. However, there are a lot of shortcomings in the existing traditional decoding algorithms, With the maturity of deep learning, the application of deep learning to the field of communication, deep learning has advantage of powerful computing, and neural network after training is static, once only need data through the network, so the deep learning was applied to the polarization code decoding process, can effectively reduce the decoding delay and improve the efficiency of decoding, this paper mainly studies convolution decoder of neural networks in all aspects of performance, can get the conclusion by experiment, with the increase of the number of iterations network decoding ability improved, error performance is getting better and better, and CNN has obvious advantages.

DOI
10.1109/icitbs53129.2021.00066

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Deep learning recently shows strong competitiveness to improve polar code decoding. However, suffering from prohibitive training and computation complexity, the conventional deep neural network (DNN) is only possible for very short code length. In this paper, the main problems of deep learning in decoding are well solved. We first present the multiple scaled belief propagation (BP) algorithm, aiming at obtaining faster convergence and better performance. Based on this, deep neural network decoder (NND) with low complexity and latency, is proposed for any code length. The training only requires a small set of zero codewords. Besides, its computation complexity is close to the original BP. Experiment results show that the proposed (64,32) NND with 5 iterations achieves even lower bit error rate (BER) than the 30-iteration conventional BP and (512, 256) NND also outperforms conventional BP decoder with same iterations. The hardware architecture of basic computation block is given and folding technique is also considered, saving about 50% hardware cost.
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With the wide application of Deep Neural Network (DNN) in the field of communication, this technique has also been applied in the coding and decoding technology, but there are few neural network structures with good performance in the decoder. This paper proposes a new polar code decoding network structure, which uses a modular network structure to train the empirical parameters in the iterative belief propagation (BP) algorithm model. The experiment part uses the new structure to implement scaling min-sum (SMS) algorithm and offset min-sum (OMS) algorithm. Through comparing the performance of the above algorithms with the traditional structure, it is found that the new structure has the advantages of better bit error rate (BER) and faster convergence performance compared with the traditional network structure.