Iterative Receiver Design for FTN Signaling Aided Sparse Code Multiple Access

Yuan, W; Wu, N; Zhang, A; Huang, X; Li, Y; Hanzo, L

Iterative Receiver Design for FTN Signaling Aided Sparse Code Multiple Access

Yuan, W

Wu, N

Zhang, A

Huang, X

Li, Y

Hanzo, L

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Publication Type:: Journal Article
Citation:: IEEE Transactions on Wireless Communications, 2020, 19 (2), pp. 915 - 928
Issue Date:: 2020-02-01

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Field	Value	Language
dc.contributor.author	Yuan, W https://orcid.org/0000-0002-2158-0046	en_US
dc.contributor.author	Wu, N https://orcid.org/0000-0002-4982-2975	en_US
dc.contributor.author	Zhang, A https://orcid.org/0000-0002-6102-3762	en_US
dc.contributor.author	Huang, X https://orcid.org/0000-0001-6869-5732	en_US
dc.contributor.author	Li, Y https://orcid.org/0000-0001-7702-1123	en_US
dc.contributor.author	Hanzo, L https://orcid.org/0000-0002-2636-5214	en_US
dc.date.issued	2020-02-01	en_US
dc.identifier.citation	IEEE Transactions on Wireless Communications, 2020, 19 (2), pp. 915 - 928	en_US
dc.identifier.issn	1536-1276	en_US
dc.identifier.uri	http://hdl.handle.net/10453/137915
dc.description.abstract	© 2002-2012 IEEE. The sparse code multiple access (SCMA) is a promising candidate for bandwidth-efficient next generation wireless communications, since it can support more users than the number of resource elements. On the same note, faster-than-Nyquist (FTN) signaling can also be used to improve the spectral efficiency. Hence in this paper, we consider a combined uplink FTN-SCMA system in which the data symbols corresponding to a user are further packed using FTN signaling. As a result, a higher spectral efficiency is achieved at the cost of introducing intentional inter-symbol interference (ISI). To perform joint channel estimation and detection, we design a low complexity iterative receiver based on the factor graph framework. In addition, to reduce the signaling overhead and transmission latency of our SCMA system, we intrinsically amalgamate it with grant-free scheme. Consequently, the active and inactive users should be distinguished. To address this problem, we extend the aforementioned receiver and develop a new algorithm for jointly estimating the channel state information, detecting the user activity and for performs data detection. In order to further reduce the complexity, an energy minimization based approximation is employed for restricting the user state to Gaussian. Finally, a hybrid message passing algorithm is conceived. Our Simulation results show that the FTN-SCMA system relying on the proposed receiver design has a higher throughput than conventional SCMA scheme at a negligible performance loss.	en_US
dc.relation.ispartof	IEEE Transactions on Wireless Communications	en_US
dc.relation.isbasedon	10.1109/TWC.2019.2950000	en_US
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Networking & Telecommunications	en_US
dc.title	Iterative Receiver Design for FTN Signaling Aided Sparse Code Multiple Access	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	19	en_US
utslib.for	0805 Distributed Computing	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - GBDTC - Global Big Data Technologies
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2021-11-06T00:00:00+1100
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	19	en_US

Abstract:

© 2002-2012 IEEE. The sparse code multiple access (SCMA) is a promising candidate for bandwidth-efficient next generation wireless communications, since it can support more users than the number of resource elements. On the same note, faster-than-Nyquist (FTN) signaling can also be used to improve the spectral efficiency. Hence in this paper, we consider a combined uplink FTN-SCMA system in which the data symbols corresponding to a user are further packed using FTN signaling. As a result, a higher spectral efficiency is achieved at the cost of introducing intentional inter-symbol interference (ISI). To perform joint channel estimation and detection, we design a low complexity iterative receiver based on the factor graph framework. In addition, to reduce the signaling overhead and transmission latency of our SCMA system, we intrinsically amalgamate it with grant-free scheme. Consequently, the active and inactive users should be distinguished. To address this problem, we extend the aforementioned receiver and develop a new algorithm for jointly estimating the channel state information, detecting the user activity and for performs data detection. In order to further reduce the complexity, an energy minimization based approximation is employed for restricting the user state to Gaussian. Finally, a hybrid message passing algorithm is conceived. Our Simulation results show that the FTN-SCMA system relying on the proposed receiver design has a higher throughput than conventional SCMA scheme at a negligible performance loss.

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http://hdl.handle.net/10453/137915