Low-Complexity CRC Aided Joint Iterative Detection and SCL Decoding Receiver of Polar Coded SCMA System

• Published in: IEEE access 2020-01, Vol.8, p.1-1
• Main Authors: Wu, Xi, Wang, Yafeng, Li, Chuanfeng
• Format: Article
• Language: English
• Subjects: Algorithms; Communications systems; Complexity; Complexity theory; Decoding; distributed CRC aided polar (DCA-polar); early termination; Error analysis; extrinsic messages; Iterative decoding; Iterative methods; Maximum likelihood decoding; Network latency; NOMA; Polar codes; Receivers; sparse code multiple access (SCMA); successive cancellation list (SCL); Wireless networks
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2020.3043017

As the fifth-generation (5G) wireless networks' key technology, the joint design of SCMA and polar code is concerned by the future communication system. In this paper, a CRC aided joint iterative detection and successive cancellation list (SCL) decoding (CAJIDS) receiver is proposed for the polar coded SCMA (PC-SCMA) system. For the receiver, the SCL decoder's extrinsic messages construction algorithm is designed by using Bayes rule and soft cancellation algorithm. Additionally, the distributed CRC aided polar (DCA-polar) code and variable list size are used to reduce the receiver's decoding latency and complexity. Simulation results demonstrate that the CAJIDS receiver has better error rate performance than the joint iterative detection and decoding (JIDD) receiver. It also outperforms the LDPC coded SCMA (LDPC-SCMA) system. Specifically, when code length N = 256 and code rate R = 1/3, the CAJIDS outperforms the JIDD and LDPC-SCMA 1.2 dB and 1.9 dB over the Rayleigh fading channel, respectively. It also shows that, compared with the fixed-list-size receiver, with a similar error rate performance, the CAJIDS receiver has lower decoding latency and complexity.