Multiple access techniques allow multiple mobile users for sharing the limited bandwidth resource and being admitted by service providers in modern mobile networks. During the last four decades, the paradigm shifts of multiple access techniques have been the key milestones of the evolution of cellular networks. In particular, time division multiple access (TDMA) and frequency division multiple access (FDMA) have been used in the first and second generations of mobile networks. The third generation of cellular networks are based on code division multiple access (CDMA), and the currently been deploying fourth generation (4G) is based on orthogonal frequency-division multiple access (OFDMA). 5G mobile networks are expected to support 1000 times higher wireless area capacity and more diversified broadband service than 4G networks. One promising solution to keep the pace with such exponential growth of 5G traffic and combat the phenomenon of spectrum crunch is to develop more spectrum and energy efficient multiple access for future generation of mobile networks. Most existing multiple access techniques were designed to ensure the orthogonality between the channels allocated to different users, in order to avoid co-channel interference. However, such orthogonal multiple access can potentially reduce spectral efficiency. For example, one frequency channel allocated to one user based on FDMA cannot be accessed by other users, even if this channel is not fully utilized by the admitted user. Motivated by this, non-orthogonal multiple access (NOMA) has been recently proposed, and the aim of this talk is to introduce the impact of such 5G NOMA on spectral efficiency.
Prof. Zhiguo Ding received his B.Eng in Electrical Engineering from the Beijing University of Posts and Telecommunications in 2000, and the Ph.D degree in Electrical Engineering from Imperial College London in 2005. From Jul. 2005 to Sept. 2014, he had been with Queen’s University Belfast, Imperial College and Newcastle University and held various academic positions. Since Oct. 2014, he has been with School of Computing and Communications, Lancaster as a Chair Professor in Signal Processing. From Oct. 2012 to Sept. 2015, he is also an academic visitor working in Professor Vincent Poor’s group at Princeton University.
Prof. Zhiguo Ding’ research interests are game theory, cooperative and energy harvesting networks, statistical signal processing, and information theory. He has published over 150 publications, including more than 70 IEEE journal papers. He was a TPC member for many international conferences, including GLOBECOM, ICC, WCNC, etc, TPC Co-Chair for the 2015 IET International Conference on Wireless, Mobile & Multimedia Networks, Co-chair for WCNC-2013 Workshop on New Advances for Physical Layer Network Coding, and served as the Editor for IEEE Transactions on Communications, IEEE Transactions on Vehicular Technology, IEEE Communication Letters, IEEE Wireless Communication Letters, and Journal of Wireless Communications and Mobile Computing. He received Overseas Research Students Award from Universities UK 2003-2005, the best paper award in IET Comm. Conf. on Wireless, Mobile and Computing, 2009, IEEE Communication Letter Exemplary Reviewer 2012, and the EU Marie Curie Fellowship 2012-2014.
Professor Jiangzhou Wang will chair the seminar and all members of staff are welcome to attend.