Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams
Complexity of non-orthogonal multiple access (NOMA) digital signal processing schemes is particularly relevant in mobile environments because of the varying channel conditions of every single user. In contrast to legacy modulation and coding schemes (MCSs), NOMA MCSs typically have irregular symbol...
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MDPI AG
2025-05-01
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author | Nenad Stefanovic Vladimir Mladenovic Borisa Jovanovic Ron Dabora Asutosh Kar |
author_facet | Nenad Stefanovic Vladimir Mladenovic Borisa Jovanovic Ron Dabora Asutosh Kar |
author_sort | Nenad Stefanovic |
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description | Complexity of non-orthogonal multiple access (NOMA) digital signal processing schemes is particularly relevant in mobile environments because of the varying channel conditions of every single user. In contrast to legacy modulation and coding schemes (MCSs), NOMA MCSs typically have irregular symbol constellations with asymmetric symbol decision regions affecting synchronization at the receiver. Research papers investigating signal processing in this emerging field usually lack sufficient details for facilitating software-defined radio (SDR) implementation. This work presents a new symbolic framework approach for simulating signal processing functions in SDR transmit–receive paths in a dynamic NOMA downlink use case. The proposed framework facilitates simple and intuitive implementation and testing of NOMA schemes and can be easily expanded and implemented on commercially available SDR hardware. We explicitly address several important design and measurement parameters and their relationship to different tasks, including variable constellation processing, carrier and symbol synchronization, and pulse shaping, focusing on quadrature amplitude modulation (QAM). The advantages of the proposed approach include intuitive symbolic modeling in a dynamic framework for NOMA signals; efficient, more accurate, and less time-consuming design flow; and generation of synthetic training data for machine-learning models that could be used for system optimization in real-world use cases. |
format | Article |
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spelling | doaj-art-0e30f7f95f074ff296f3ba49feb0fafd2025-06-25T13:57:37ZengMDPI AGInformation2078-24892025-05-0116646810.3390/info16060468Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation DiagramsNenad Stefanovic0Vladimir Mladenovic1Borisa Jovanovic2Ron Dabora3Asutosh Kar4Center for Applied Mathematics and Electronics, 11000 Belgrade, SerbiaFaculty of Technical Sciences, 32000 Čačak, SerbiaMilitary Academy, University of Defence, 11042 Belgrade, SerbiaSchool of Electrical and Computer Engineering, Ben-Gurion University, Be’er Sheva 8410501, IsraelDr BR Ambedkar National Institute of Technology, Jalandhar 144008, Punjab, IndiaComplexity of non-orthogonal multiple access (NOMA) digital signal processing schemes is particularly relevant in mobile environments because of the varying channel conditions of every single user. In contrast to legacy modulation and coding schemes (MCSs), NOMA MCSs typically have irregular symbol constellations with asymmetric symbol decision regions affecting synchronization at the receiver. Research papers investigating signal processing in this emerging field usually lack sufficient details for facilitating software-defined radio (SDR) implementation. This work presents a new symbolic framework approach for simulating signal processing functions in SDR transmit–receive paths in a dynamic NOMA downlink use case. The proposed framework facilitates simple and intuitive implementation and testing of NOMA schemes and can be easily expanded and implemented on commercially available SDR hardware. We explicitly address several important design and measurement parameters and their relationship to different tasks, including variable constellation processing, carrier and symbol synchronization, and pulse shaping, focusing on quadrature amplitude modulation (QAM). The advantages of the proposed approach include intuitive symbolic modeling in a dynamic framework for NOMA signals; efficient, more accurate, and less time-consuming design flow; and generation of synthetic training data for machine-learning models that could be used for system optimization in real-world use cases.https://www.mdpi.com/2078-2489/16/6/468NOMASDRsymbolic computationsignal processingmodulation impairmentserror vector magnitude |
spellingShingle | Nenad Stefanovic Vladimir Mladenovic Borisa Jovanovic Ron Dabora Asutosh Kar Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams Information NOMA SDR symbolic computation signal processing modulation impairments error vector magnitude |
title | Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams |
title_full | Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams |
title_fullStr | Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams |
title_full_unstemmed | Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams |
title_short | Symbolic Framework for Evaluation of NOMA Modulation Impairments Based on Irregular Constellation Diagrams |
title_sort | symbolic framework for evaluation of noma modulation impairments based on irregular constellation diagrams |
topic | NOMA SDR symbolic computation signal processing modulation impairments error vector magnitude |
url | https://www.mdpi.com/2078-2489/16/6/468 |
work_keys_str_mv | AT nenadstefanovic symbolicframeworkforevaluationofnomamodulationimpairmentsbasedonirregularconstellationdiagrams AT vladimirmladenovic symbolicframeworkforevaluationofnomamodulationimpairmentsbasedonirregularconstellationdiagrams AT borisajovanovic symbolicframeworkforevaluationofnomamodulationimpairmentsbasedonirregularconstellationdiagrams AT rondabora symbolicframeworkforevaluationofnomamodulationimpairmentsbasedonirregularconstellationdiagrams AT asutoshkar symbolicframeworkforevaluationofnomamodulationimpairmentsbasedonirregularconstellationdiagrams |