NDLI: A low complexity detector for downlink SCMA systems

Content Provider	IET Digital Library
Author	Tian, Lining Zhao, Minjian Zhong, Jie Xiao, Pei Wen, Lei
Abstract	Sparse code multiple access (SCMA) is a novel non-orthogonal multiple access scheme for 5G systems, in which the logarithm domain message passing algorithm (Log-MPA) is applied at the receiver to achieve near-optimum performance. However, the computational complexity of Log-MPA detector is still a big challenge for practical implementation, especially for energy-sensitive user equipments in the downlink scenario. A region-restricted detector with an improved Log-MPA (RRL detector) is proposed for downlink SCMA systems, in which the complexity is reduced from two perspectives. To avoid unnecessary calculations when searching the superposition constellation exhaustively, the proposed RRL detector updates the function nodes only within a restricted search region. While constellation points outside the search region are neglected, the performance is well maintained which is verified by simulations. Besides, the original Log-MPA heavily relies on exponential operations, resulting in high computational complexity. To solve this problem, an improved Log-MPA is also put forward in this study to make a better compromise between complexity and performance. Simulation results show that the complexity of the RRL detector is reduced considerably while the bit error rate performance degrades unnoticeably.
Starting Page	2433
Ending Page	2439
Page Count	7
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 16, Nov (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.0420
Journal	IET Communications
Publisher Date	2017-08-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	5G Mobile Communication 5G System Bit Error Rate Performance Computational Complexity Downlink SCMA System Energy-sensitive User Equipments Error Statistics Exponential Distribution Exponential Operation Log-MPA Detector Logarithm Domain Message Passing Algorithm Low-complexity Detector Message Passing Mobile Radio System Multi-access System Multiple Access Communication Nonorthogonal Multiple Access Scheme RRL Detector Signal Detection Sparse Code Multiple Access Scheme Statistics Superposition Constellation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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