Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design
Non orthogonal multiple access (NOMA) systems are very important for future communications which allows a huge increase in capacity gains when comparing to conventional orthogonal multiple access (OMA) techniques. On the other hand, the power consumption at the access point (AP) should be as low as...
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| Format: | Article |
| Language: | English |
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IEEE
2024-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10443613/ |
| _version_ | 1797243289821249536 |
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| author | Oussama Ben Haj Belkacem Rui Dinis Mohamed Lassaad Ammari |
| author_facet | Oussama Ben Haj Belkacem Rui Dinis Mohamed Lassaad Ammari |
| author_sort | Oussama Ben Haj Belkacem |
| collection | DOAJ |
| description | Non orthogonal multiple access (NOMA) systems are very important for future communications which allows a huge increase in capacity gains when comparing to conventional orthogonal multiple access (OMA) techniques. On the other hand, the power consumption at the access point (AP) should be as low as possible, making single-carrier (SC) schemes, such as single carrier with frequency-domain equalization (SC-FDE), particularly interesting. In this paper, we consider power-efficient NOMA systems employing SC-FDE signals and present a generalized framework to characterize the signals at the output of a nonlinear device. We develop an accurate estimation of the power spectral density (PSD) of the signal associated to each user, showing that the nonlinear distortion effects on some users can be very high. Therefore, we introduce a joint iterative receiver for distortion compensation and interference cancellation based on SC-FDE characterized by low-complexity suitable for scenarios with strong nonlinear effects. Our performance results indicate that the proposed technique is able to reduce considerably the degradation associated to a high power amplifier (HPA) modeled as a memoryless polynomial and allow complexity improvements when compared to conventional schemes, especially when operating at low input back-off (IBO). |
| first_indexed | 2024-04-24T18:52:45Z |
| format | Article |
| id | doaj.art-57d37ae28b524454b8b22af6b2317d91 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-04-24T18:52:45Z |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-57d37ae28b524454b8b22af6b2317d912024-03-26T17:48:33ZengIEEEIEEE Access2169-35362024-01-0112380573807010.1109/ACCESS.2024.336903010443613Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver DesignOussama Ben Haj Belkacem0https://orcid.org/0000-0003-0240-0449Rui Dinis1https://orcid.org/0000-0002-8520-7267Mohamed Lassaad Ammari2https://orcid.org/0000-0002-2871-8538Innov’Com Laboratory, Sup’Com, University of Carthage, Tunis, TunisiaInstituto de Telecomunicações, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, PortugalNOCCS Laboratory, National Engineering School of Sousse, University of Sousse, Sousse, TunisiaNon orthogonal multiple access (NOMA) systems are very important for future communications which allows a huge increase in capacity gains when comparing to conventional orthogonal multiple access (OMA) techniques. On the other hand, the power consumption at the access point (AP) should be as low as possible, making single-carrier (SC) schemes, such as single carrier with frequency-domain equalization (SC-FDE), particularly interesting. In this paper, we consider power-efficient NOMA systems employing SC-FDE signals and present a generalized framework to characterize the signals at the output of a nonlinear device. We develop an accurate estimation of the power spectral density (PSD) of the signal associated to each user, showing that the nonlinear distortion effects on some users can be very high. Therefore, we introduce a joint iterative receiver for distortion compensation and interference cancellation based on SC-FDE characterized by low-complexity suitable for scenarios with strong nonlinear effects. Our performance results indicate that the proposed technique is able to reduce considerably the degradation associated to a high power amplifier (HPA) modeled as a memoryless polynomial and allow complexity improvements when compared to conventional schemes, especially when operating at low input back-off (IBO).https://ieeexplore.ieee.org/document/10443613/Non-orthogonal multiple access (NOMA)high-power amplifiers (HPA)single carrier with frequency-domain equalization SC-FDEnonlinear distortionperformance evaluation |
| spellingShingle | Oussama Ben Haj Belkacem Rui Dinis Mohamed Lassaad Ammari Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design IEEE Access Non-orthogonal multiple access (NOMA) high-power amplifiers (HPA) single carrier with frequency-domain equalization SC-FDE nonlinear distortion performance evaluation |
| title | Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design |
| title_full | Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design |
| title_fullStr | Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design |
| title_full_unstemmed | Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design |
| title_short | Nonlinear Effects in NOMA Systems Using Single Carrier Modulations: Performance Evaluation and Receiver Design |
| title_sort | nonlinear effects in noma systems using single carrier modulations performance evaluation and receiver design |
| topic | Non-orthogonal multiple access (NOMA) high-power amplifiers (HPA) single carrier with frequency-domain equalization SC-FDE nonlinear distortion performance evaluation |
| url | https://ieeexplore.ieee.org/document/10443613/ |
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