Design and optimization of joint iterative detection and decoding receiver for uplink polar coded SCMA system

Pan, Z., Li, E., Zhang, L. , Lei, J. and Tang, C. (2018) Design and optimization of joint iterative detection and decoding receiver for uplink polar coded SCMA system. IEEE Access, 6, pp. 52014-52026. (doi: 10.1109/ACCESS.2018.2869906)

Abstract

SCMA and polar coding are possible candidates for 5G systems. In this paper, we firstly propose the joint iterative detection and decoding (JIDD) receiver for the uplink polar coded sparse code multiple access (PC-SCMA) system. Then, the EXIT chart is used to investigate the performance of the JIDD receiver. Additionally, we optimize the system design and polar code construction based on the EXIT chart analysis. The proposed receiver integrates the factor graph of SCMA detector and polar soft-output decoder into a joint factor graph, which enables the exchange of messages between SCMA detector and polar decoder iteratively. Simulation results demonstrate that the JIDD receiver has better BER performance and lower complexity than the separate scheme. Specifically, when polar code length N=256 and code rate R=1/2 , JIDD outperforms the separate scheme 4.8 and 6 dB over AWGN channel and Rayleigh fading channel, respectively. It also shows that, under 150% system loading, the JIDD receiver only has 0.3 dB performance loss compared to the single user uplink PC-SCMA over AWGN channel and 0.6 dB performance loss over Rayleigh fading channel.

• Item Type: Articles
• Additional Information: This work was supported in part by the National Natural Science Foundation of China under Grant 61501479, Grant 61372098, Grant 61702536, and Grant 61502518, and in part by the Natural Science Foundation of Hunan Province under Grant 2017JJ2303 and Grant 2018JJ3609.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Zhang, Professor Lei
• Authors: Pan, Z., Li, E., Zhang, L., Lei, J., and Tang, C.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: IEEE Access
• Publisher: IEEE
• ISSN: 2169-3536
• ISSN (Online): 2169-3536
• Published Online: 13 September 2018
• Copyright Holders: Copyright © 2018 IEEE
• First Published: First published in IEEE Access 6: 52014-52026
• Publisher Policy: Reproduced in accordance with the publisher copyright policy