A Novel Spectrally-Efficient Uplink Hybrid-Domain NOMA System
This letter proposes a novel hybrid-domain (HD) non-orthogonal multiple access (NOMA) approach to support a larger number of uplink users than the recently proposed code-domain NOMA approach, i.e., sparse code multiple access (SCMA). HD-NOMA combines the code-domain and power-domain NOMA schemes by...
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| Published in: | IEEE communications letters Vol. 24; no. 11; pp. 2609 - 2613 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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New York
IEEE
01.11.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1089-7798, 1558-2558 |
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| Abstract | This letter proposes a novel hybrid-domain (HD) non-orthogonal multiple access (NOMA) approach to support a larger number of uplink users than the recently proposed code-domain NOMA approach, i.e., sparse code multiple access (SCMA). HD-NOMA combines the code-domain and power-domain NOMA schemes by clustering the users in small path loss (strong) and large path loss (weak) groups. The two groups are decoded using successive interference cancellation while within the group users are decoded using the message passing algorithm. To further improve the performance of the system, a spectral-efficiency maximization problem is formulated under a user quality-of-service constraint, which dynamically assigns power and subcarriers to the users. The problem is non-convex and has sparsity constraints. The alternating optimization procedure is used to solve it iteratively. We apply successive convex approximation and reweighted <inline-formula> <tex-math notation="LaTeX">\ell _1 </tex-math></inline-formula> minimization approaches to deal with the non-convexity and sparsity constraints, respectively. The performance of the proposed HD-NOMA is evaluated and compared with the conventional SCMA scheme through numerical simulation. The results show the potential of HD-NOMA in increasing the number of uplink users that can be supported in a given time-frequency resource. |
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| AbstractList | This letter proposes a novel hybrid-domain (HD) non-orthogonal multiple access (NOMA) approach to support a larger number of uplink users than the recently proposed code-domain NOMA approach, i.e., sparse code multiple access (SCMA). HD-NOMA combines the code-domain and power-domain NOMA schemes by clustering the users in small path loss (strong) and large path loss (weak) groups. The two groups are decoded using successive interference cancellation while within the group users are decoded using the message passing algorithm. To further improve the performance of the system, a spectral-efficiency maximization problem is formulated under a user quality-of-service constraint, which dynamically assigns power and subcarriers to the users. The problem is non-convex and has sparsity constraints. The alternating optimization procedure is used to solve it iteratively. We apply successive convex approximation and reweighted [Formula Omitted] minimization approaches to deal with the non-convexity and sparsity constraints, respectively. The performance of the proposed HD-NOMA is evaluated and compared with the conventional SCMA scheme through numerical simulation. The results show the potential of HD-NOMA in increasing the number of uplink users that can be supported in a given time-frequency resource. This letter proposes a novel hybrid-domain (HD) non-orthogonal multiple access (NOMA) approach to support a larger number of uplink users than the recently proposed code-domain NOMA approach, i.e., sparse code multiple access (SCMA). HD-NOMA combines the code-domain and power-domain NOMA schemes by clustering the users in small path loss (strong) and large path loss (weak) groups. The two groups are decoded using successive interference cancellation while within the group users are decoded using the message passing algorithm. To further improve the performance of the system, a spectral-efficiency maximization problem is formulated under a user quality-of-service constraint, which dynamically assigns power and subcarriers to the users. The problem is non-convex and has sparsity constraints. The alternating optimization procedure is used to solve it iteratively. We apply successive convex approximation and reweighted <inline-formula> <tex-math notation="LaTeX">\ell _1 </tex-math></inline-formula> minimization approaches to deal with the non-convexity and sparsity constraints, respectively. The performance of the proposed HD-NOMA is evaluated and compared with the conventional SCMA scheme through numerical simulation. The results show the potential of HD-NOMA in increasing the number of uplink users that can be supported in a given time-frequency resource. |
| Author | Yadav, Animesh Quan, Chen Poor, H. Vincent Varshney, Pramod K. Geng, Baocheng |
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| Cites_doi | 10.1038/sj.jors.2600425 10.1109/TWC.2019.2939820 10.1109/VTCSpring.2013.6692652 10.1109/ICCChina.2016.7636728 10.1109/18.910572 10.1109/GLOCOM.2016.7841947 10.1109/LCOMM.2019.2911082 10.1007/s00041-008-9045-x 10.1109/MWC.2018.1700404 10.1109/PIMRC.2013.6666156 10.1109/VTCFall.2014.6966170 10.1109/COMST.2016.2621116 10.1017/CBO9780511807213 10.1109/WCSP.2015.7341328 10.1109/ACCESS.2017.2775338 |
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| SubjectTerms | Algorithms Clustering Convexity Decoding Domains Hybrid systems Message passing NOMA non-orthogonal multiple access Nonorthogonal multiple access Optimization Performance enhancement Resource management Silicon carbide Sparse code multiple access Sparsity Subcarriers Uplink wireless communications |
| Title | A Novel Spectrally-Efficient Uplink Hybrid-Domain NOMA System |
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