Polar Codes for Soft Decode-and-Forward in HalfDuplex Relay Channels

Soft decode-and-forward（DF） can combine the advantages of both amplify-and-forward and hard DF in relay channels. In this paper, we propose a low-complexity soft DF scheme based on polar codes, which features two key techniques： a low-complexity cyclic redundancy check（CRC） aided list successive can...

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Bibliographic Details
Published in:中国通信：英文版 2017, Vol.14 (8), p.22-32
Main Author: Fangliao Yang Kai Niu Chao Dong Baoyu Tian
Format: Article
Language:English
Subjects:
中继信道
低复杂度
低密度奇偶校验码
半双工
循环冗余校验
极性
解码器
转发
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Summary:Soft decode-and-forward（DF） can combine the advantages of both amplify-and-forward and hard DF in relay channels. In this paper, we propose a low-complexity soft DF scheme based on polar codes, which features two key techniques： a low-complexity cyclic redundancy check（CRC） aided list successive cancellation（CALSC） decoder and a soft information calculation method. At the relay node, a low-complexity CALSC decoder is designed to reduce the computational complexity by adjusting the list size according to the reliabilities of decoded bits. Based on the path probability metric of the CALSC decoder, we propose a method to compute the soft information of the decoded bits in CALSC. Simulation results show that our proposed scheme outperforms the soft DF based on low-density parity-check codes and the soft DF with belief propagation or soft cancellation decoder, especially in the case when the source-relay channel is at the high signal-to-ratio region.
ISSN:1673-5447