Understanding the Capacity of Multi-Cell Non-orthogonal Multiple Access Systems
With the potential of enabling the massive device connection and enhancing the spectrum efficiency, non-orthogonal multiple access (NOMA) has been considered as a promising technology for the sixth generation (6G) wireless communication networks. The key idea of NOMA is to allow signals of different users to be superimposed on each other at the same time and on the same frequency. To extract intended messages, a receiver applies successive interference cancellation (SIC) to separate signals from different users. In this talk, we consider a fundamental problem for multi-cell NOMA systems: the achievable rate region, or equivalently the feasible signal-to-interference-plus-noise ratio (SINR) region. We introduce some necessary and sufficient conditions for an SINR to be feasible in the downlink and uplink NOMA systems respectively. In addition, we establish a duality between the downlink and uplink NOMA system. All these results give a complete understanding of the theoretical bound on the performance of NOMA systems.
Dr.Yi Chen received her B.Eng. degree in Communication Engineering from Beijing University of Posts and Telecommunications in 2007, and Ph.D. degree in Information Engineering from The Chinese University of Hong Kong in 2012. From 2012 to 2015, she worked as a postdoctoral researcher in the Department of Electronic Engineering, City University of Hong Kong. She has been with Shenzhen Research Institute of Big Data since 2016. Her research interests include wireless communications, resource allocation, network routing and reinforcement learning.
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