Capacity Analysis of Non-Orthogonal Multiple Access for Uplink and Downlink

Keywords: OMA, NOMA, rate-region, spectral efficiency, power allocation factor


Non-orthogonal multiple access (NOMA) is intended to be used for the next generation 5G cellular networks. In this paper, the expressions for the channel capacities for symmetric and asymmetric NOMA networks have been analysed. The performance measure of user spectral efficiency and the sum-rate bounds, for the NOMA and the existing orthogonal multiple access (OMA) networks have been compared. Furthermore, analysis of user rate and capacity of NOMA network has been carried out and it is observed that the NOMA capacity region varies as a function of the power allocation factor. The corresponding models have been developed for both uplink and downlink, and simulated with MATLAB. The NOMA performance with imperfect Successive Interference Cancellation (SIC) decoding is also analysed for the downlink. It is also verified that the transmit power may be increased to counter the spectral efficiency reduction due to imperfect SIC.


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Author Biographies

Saurabh Srivastava, Dept. of ECE, Birla Institute of Technology, Mesra, Jharkhand, India

Saurabh Srivastava is a Ph.D. student at the Birla Institute of Technology, Mesra, India since spring 2018. He received his B.Tech. in Electronics and Communication Engineering in 2002. He completed his M.Tech. in Electronics and Communication Engineering from National Institute of Technology, Kurukshetra, India in 2006. He has a teaching experience of over 11 years. He, as a faculty member and researcher, has authored in various conferences and national/international journals. Srivastava is currently completing his doctorate in Electronics and Communications at the Birla Institute of Technology. His Ph.D. work centres on Non-Orthogonal Multiple Access and discusses the future multiple access schemes for the next generation wireless networks.

Prajna Parimita Dash, Dept. of ECE, Birla Institute of Technology, Mesra, Jharkhand, India

Prajna Parimita Dash earned her PhD degree from the Department of Electrical Engineering, NIT Rourkela, India in the year 2017. She is currently working as an Assistant Professor in the Dept. of Electronics and Communication Engineering of Birla Institute of Technology, Mesra, Ranchi, India. Her research interest includes Computer Vision, Image Processing, Signal Processing and Wireless communication. She has co-authored a number of research articles in various prestigious journals, conferences, and book chapters.

Sanjay Kumar, Dept. of ECE, Birla Institute of Technology, Mesra (Deoghar Campus), Jharkhand, India

Sanjay Kumar has received MBA from Pune University in 1994, M. Tech. in Electronics and Communication Engineering from Guru Nanak Dev Engineering College, Ludhiana in 2000, and PhD in Wireless Communication from Aalborg University, Denmark in 2009. He is an Associate Professor at the Department of Electronics and Communications Engineering at Birla Institute of Technology Mesra, Deoghar Campus, India. During 2006 to 2009 he was a Guest Researcher at Aalborg University, Denmark, where he worked in close association with Nokia Siemens Networks. During 2007 to 2008 he worked as Part-time Lecturer in department of Electronic Systems, Aalborg University, Denmark. Before joining teaching and research he served the Indian Air Force from 1985 to 2000 in various technical capacities. He has nearly 35 years of teaching, research and work experience in the field of Wireless Communication. He is an Editorial Board Member of the International Journal, “Wireless Personal Communications” published by Springer.


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