Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED

An optimized design of a sparse code multiple access (SCMA) codebook for uplink wireless communications is presented by dividing an optimized 16-point round quadrature amplitude modulation (QAM) into several subsets. The main goal of the scheme is to maximize the minimum Euclidean distance and thus...

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Autores principales:	Shunlan Liu, Jing Wang, Jianrong Bao, Chao Liu
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2018
Materias:	SCMA codebook design constellation segmentation subset division minimum Euclidean distance Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/33c8ab1527b849f28648a8b98477efee
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spelling	oai:doaj.org-article:33c8ab1527b849f28648a8b98477efee2021-11-19T00:02:18ZOptimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED2169-353610.1109/ACCESS.2018.2876030https://doaj.org/article/33c8ab1527b849f28648a8b98477efee2018-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/8492404/https://doaj.org/toc/2169-3536An optimized design of a sparse code multiple access (SCMA) codebook for uplink wireless communications is presented by dividing an optimized 16-point round quadrature amplitude modulation (QAM) into several subsets. The main goal of the scheme is to maximize the minimum Euclidean distance and thus reduces the collisions of the information bits on the resources. The final SCMA codebook is obtained with the mapping matrix, which indicates the sub-constellations generating by dividing the mother QAM constellation. Simulation results show that, in a Nakagami fading channel, the optimized SCMA scheme by the proposed design method achieves significantly performance gains approximately 1.0, 1.4, 2.5, 3.5, and 4.0 dB at bit error rate of <inline-formula> <tex-math notation="LaTeX">$10^{-4}$ </tex-math></inline-formula>, respectively, when compared with those of an undivided 16-QAM constellation, a trellis code modulation (TCM) division, an original SCMA codebooks, a low-density signature (LDS), and an irregular LDS (IrLDS) schemes. In addition, at the signal-to-noise ratio ranging from 0 to 10 dB, the constellation constrained capacity of the scheme by the proposed method achieves more gains over those of the original SCMA, TCM, the undivided star-QAM, the LDS, and the IrLDS schemes. Thus, it can be combined with the grant-free random access mechanism to obtain rapid and low-cost access in next-generation wireless packet services and other applications.Shunlan LiuJing WangJianrong BaoChao LiuIEEEarticleSCMAcodebook designconstellation segmentationsubset divisionminimum Euclidean distanceElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 6, Pp 63232-63242 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	SCMA codebook design constellation segmentation subset division minimum Euclidean distance Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	SCMA codebook design constellation segmentation subset division minimum Euclidean distance Electrical engineering. Electronics. Nuclear engineering TK1-9971 Shunlan Liu Jing Wang Jianrong Bao Chao Liu Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
description	An optimized design of a sparse code multiple access (SCMA) codebook for uplink wireless communications is presented by dividing an optimized 16-point round quadrature amplitude modulation (QAM) into several subsets. The main goal of the scheme is to maximize the minimum Euclidean distance and thus reduces the collisions of the information bits on the resources. The final SCMA codebook is obtained with the mapping matrix, which indicates the sub-constellations generating by dividing the mother QAM constellation. Simulation results show that, in a Nakagami fading channel, the optimized SCMA scheme by the proposed design method achieves significantly performance gains approximately 1.0, 1.4, 2.5, 3.5, and 4.0 dB at bit error rate of <inline-formula> <tex-math notation="LaTeX">$10^{-4}$ </tex-math></inline-formula>, respectively, when compared with those of an undivided 16-QAM constellation, a trellis code modulation (TCM) division, an original SCMA codebooks, a low-density signature (LDS), and an irregular LDS (IrLDS) schemes. In addition, at the signal-to-noise ratio ranging from 0 to 10 dB, the constellation constrained capacity of the scheme by the proposed method achieves more gains over those of the original SCMA, TCM, the undivided star-QAM, the LDS, and the IrLDS schemes. Thus, it can be combined with the grant-free random access mechanism to obtain rapid and low-cost access in next-generation wireless packet services and other applications.
format	article
author	Shunlan Liu Jing Wang Jianrong Bao Chao Liu
author_facet	Shunlan Liu Jing Wang Jianrong Bao Chao Liu
author_sort	Shunlan Liu
title	Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
title_short	Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
title_full	Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
title_fullStr	Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
title_full_unstemmed	Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
title_sort	optimized scma codebook design by qam constellation segmentation with maximized med
publisher	IEEE
publishDate	2018
url	https://doaj.org/article/33c8ab1527b849f28648a8b98477efee
work_keys_str_mv	AT shunlanliu optimizedscmacodebookdesignbyqamconstellationsegmentationwithmaximizedmed AT jingwang optimizedscmacodebookdesignbyqamconstellationsegmentationwithmaximizedmed AT jianrongbao optimizedscmacodebookdesignbyqamconstellationsegmentationwithmaximizedmed AT chaoliu optimizedscmacodebookdesignbyqamconstellationsegmentationwithmaximizedmed
_version_	1718420661490155520

Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED

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