Synergy of OFDMA & NOMA used in Modern Wireless Communication
Keywords:
5G, NOMA (Non-orthogonal multiple access), OFDM (Orthogonal frequency division multiplexing), Power domain multiplexing, Spectrum efficiency, Successive interference cancellation (SIC), Wireless communicationAbstract
As wireless technology continues to evolve, the demand for faster speeds, better connectivity, and efficient use of available spectrum is growing rapidly. OFDM (Orthogonal Frequency Division Multiplexing) has been a reliable technique for transmitting data, offering strong performance in handling interference and signal fading. But as networks expand and more users connect, OFDM alone is not enough. That is where NOMA (Non-Orthogonal Multiple Access) steps in. Unlike traditional methods that separate users by time or frequency, NOMA allows multiple users to share the same resources by managing signal power levels. This paper explores both OFDM and NOMA in detail how they work, where they fall short, and most importantly, what happens when they are used together. By combining their strengths, wireless networks can handle more users, improve efficiency, and better meet the needs of future technologies like 5G and beyond. The paper also highlights key challenges in this integration and looks at its potential in real-world applications.
References
M. B. Sutar and V. S. Patil, “LS and MMSE estimation with different fading channels for OFDM system,” 2017 International conference of Electronics, Communication and Aerospace Technology (ICECA), Coimbatore, India, 2017, pp. 740-745, doi: https://doi.org/10.1109/ICECA.2017.8203641
E. Björnson, “Is there a future for NOMA? Wireless Future Blog,” Ellintech.se, Apr. 15, 2021. https://ma-mimo.ellintech.se/2021/04/15/is-there-a-future-for-noma/
P. Sarkar, A. Saha, A. Banerjee, and V. Chakraborty, “Novel method of capacity enhancement: Integrating MIMO with beam steering, OFDM and NOMA with different modulation,” Journal of Optics, Mar. 2025, doi: https://doi.org/10.1007/s12596-025-02685-9
M. B. Shahab, R. Abbas, M. Shirvanimoghaddam and S. J. Johnson, “Grant-free non-orthogonal multiple access for IoT: A survey,” in IEEE Communications Surveys & Tutorials, vol. 22, no. 3, pp. 1805-1838, thirdquarter 2020, doi: https://doi.org/10.1109/COMST.2020.2996032
T. S. Rappaport, Wireless Communications: Principles and Practice, 2nd ed. Upper Saddle River, NJ, USA: Prentice Hall, 2002.
A. T. Abusabah and H. Arslan, “NOMA for multinumerology OFDM systems,” Wireless Communications and Mobile Computing, vol. 2018, no. 1, Jan. 2018, doi: https://doi.org/10.1155/2018/8514314
Y. Chen et al., “Toward the standardization of non-orthogonal multiple access for next generation wireless networks,” in IEEE Communications Magazine, vol. 56, no. 3, pp. 19-27, March 2018, doi: https://doi.org/10.1109/MCOM.2018.1700845
K. Senel and S. Tekinay, “Optimal power allocation in NOMA systems with”, GLOBECOM 2017 - 2017 IEEE Global Communications Conference, Singapore, 2017, pp. 1-7, doi: https://doi.org/10.1109/GLOCOM.2017.8254919
Z. Ding et al., “Application of non-orthogonal multiple access in LTE and 5G networks,” IEEE Communications Magazine, vol. 55, no. 2, pp. 185–191, Feb. 2017, doi: https://doi.org/10.1109/MCOM.2017.1500657CM
W. Saad, M. Bennis and M. Chen, “A vision of 6G wireless systems: Applications, trends, technologies, and open research problems,” in IEEE Network, vol. 34, no. 3, pp. 134-142, May/June 2020, doi: https://doi.org/10.1109/MNET.001.1900287
Richard van Nee and R. Prasad, OFDM for Wireless Multimedia Communications. Artech House Universal Persona, 2000. Available: https://dl.acm.org/doi/abs/10.5555/555664
Z. Ding, F. Adachi and H. V. Poor, “The application of MIMO to non-orthogonal multiple access,” in IEEE Transactions on Wireless Communications, vol. 15, no. 1, pp. 537-552, Jan. 2016, doi: https://doi.org/10.1109/TWC.2015.2475746
S. M. R. Islam, N. Avazov, O. A. Dobre and K. -s. Kwak, “Power-domain non-orthogonal multiple access (NOMA) in 5G systems: Potentials and challenges,” in IEEE Communications Surveys & Tutorials, vol. 19, no. 2, pp. 721-742, Second quarter 2017, doi: https://doi.org/10.1109/COMST.2016.2621116
B. Li, J. Shi, and S. Feng, “Reconstructed hybrid optical OFDM-NOMA for multiuser VLC systems,” Photonics, vol. 9, no. 11, pp. 857–857, Nov. 2022, doi: https://doi.org/10.3390/photonics9110857
R. Ruby, D. W. K. Ng, V. C. M. Leung, and T. Riihonen, Non-orthogonal multiple access techniques in emerging wireless networks, Springer Open. Available: https://www.springeropen.com/collections/noma
A. Tusha, S. Doğan and H. Arslan, “A hybrid downlink NOMA with OFDM and OFDM-IM for beyond 5G wireless networks,” in IEEE Signal Processing Letters, vol. 27, pp. 491-495, 2020, doi: https://doi.org/10.1109/LSP.2020.2979059
S. U. Rahman, A. Sultan, Roobaea Alroobaea, Muhammad Talha, S. B. Hussain, and M. A. Raza, “Secure OFDM-based NOMA for machine-to-machine communication,” Wireless Communications and Mobile Computing, vol. 2021, no. 1, Jan. 2021, doi: https://doi.org/10.1155/2021/6615767
H. Khandelwal, Ajay Somkuwar, and J. S. Yadav, “Optimal power allocation based on OFDM-NOMA network using firefly optimization,” Electric Power Components and Systems, vol. 51, no. 18, pp. 2116–2124, May 2023, doi: https://doi.org/10.1080/15325008.2023.2205432
L. Lin, W. Xu, F. Wang, Y. Zhang, W. Zhang and P. Zhang, “Channel-transferable semantic communications for multi-user OFDM-NOMA systems,” in IEEE Wireless Communications Letters, vol. 13, no. 3, pp. 721-725, March 2024, doi: https://doi.org/10.1109/LWC.2023.3340657
M. M. Şahin, O. Dizdar, B. Clerckx and H. Arslan, “Multicarrier rate-splitting multiple access: Superiority of OFDM-RSMA over OFDMA and OFDM-NOMA,” in IEEE Communications Letters, vol. 27, no. 11, pp. 3088-3092, Nov. 2023, doi: https://doi.org/10.1109/LCOMM.2023.3310937
