Next generation wireless networks require massive uplink connections as well as high spectral efficiency. It is well known that, theoretically, it is not possible to achieve the sum capacity of multi-user communications with orthogonal multiple access. To meet the challenging requirements of next generation networks, researchers have explored non-orthogonal and overloaded transmission technologies–known as new radio multiple access (NR-MA) schemes–for fifth generation (5G) networks. In this seminar, we will discuss the key features of the promising NR-MA schemes for the massive uplink connections. The candidate schemes of NR-MA can be characterized by multiple access signatures (MA-signatures), such as codebook, sequence, and interleaver/scrambler. At the receiver side, advanced multiuser detection (MUD) schemes are employed to extract each user’s data from non-orthogonally superposed data according to MA-signatures. Through link-level and system-level simulations, we will compare the performances of NR-MA candidates under the same conditions. Lastly, we will discuss the tips for system operations as well as call attention to the remaining technical challenges.
Daesik Hong received the B.S. and M.S. degrees in Electronics Engineering from Yonsei University, Seoul, Korea, in 1983 and 1985, respectively, and the Ph.D. degree from the School of Electronics Engineering, Purdue University, West Lafayette, IN, in 1990. He joined Yonsei University in 1991, where he is currently the Dean of the College of Engineering and a Professor with the School of Electrical and Electronic Engineering. He is also currently President of the Institute of Electronics and Information Engineering, Korea. He has been serving as Chair of Samsung-Yonsei Research Center for Mobile Intelligent Terminals. He also served as a Vice-President of Research Affairs and a President of Industry-Academic Cooperation Foundation, Yonsei University, from 2010 to 2011. He also served as a Chief Executive Officer (CEO) for Yonsei Technology Holding Company in 2011, and served as a Vice-Chair of the Institute of Electronics Engineers of Korea (IEEK) in 2012. Dr. Hong is a senior member of the IEEE. He served as an editor of the IEEE Transactions on Wireless Communications from 2006 to 2011, and as an editor of the IEEE Communications Letters from 2011 to 2016. He was appointed as the Underwood/Avison distinguished professor at Yonsei University in 2010, and received the Best Teacher Award at Yonsei University in 2006 and 2010. He was also a recipient of the Hae-Dong Outstanding Research Awards of the Korean Institute of Communications and Information Sciences (KICS) in 2006 and the Institute of Electronics Engineers of Korea (IEEK) in 2009. His current research activities are focused on future wireless communication including new waveform, non-orthogonal multiple access, full-duplex, energy harvesting, and vehicle-to-everything communication systems. More information about his research is available at http://mirinae.yonsei.ac.kr.