Up-Link NOMA with Decentralized Power Control.
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Up-Link NOMA with Decentralized Power Control.
Thu, 11/05/2017 - 13:30 to 14:30
Location:
Speaker:
Prof. Li Ping
Affiliation:
City University of Hong Kong
Synopsis:
Non-orthogonal multiple access (NOMA) has been widely discussed recently for the future 5th generation (5G) cellular systems. One of the key requirement for 5G is to support machine-to-machine (MTM) communications. This class of communications is characterized by a large number of simple mobile terminals with sporadic short messages. Decentralized random access avoids the cost of centralized control in such environments.
This talk provides overview on NOMA and decentralized random access in NOMA. We present a scheme in which each user randomly selects a power level according to a proper power distribution. Serial interference cancelation (SIC) is used at the receiver to minimize the probability of collision. Our focus is on the design of the power distribution to maximize throughput under a given sum-power constraint. We show that the supports of the optimal power distributions are of discrete nature, which greatly simplifies the optimization problem. Numerical results demonstrate that the new scheme can achieve significantly higher throughput than the conventional ALOHA system. Throughput gain of several folds is observed in fading channels.
Biography:
Prof. Li Ping received his Ph.D. degree at Glasgow University in 1990. He lectured at Department of Electronic Engineering, Melbourne University, from 1990 to 1992, and worked as a research staff at Telecom Australia Research Laboratories from 1993 to 1995. Since January 1996, he has been with the Department of Electronic Engineering, City University of Hong Kong, where he is now a professor of information engineering. Prof. Li Ping received the IEE J J Thomson premium in 1993, the Croucher Foundation Award in 2005 and a British Royal Academy of Engineering Distinguished Visiting Fellowship in 2010. He served as a member of the Board of Governors for IEEE Information Theory Society from 2010 to 2012 and he is a fellow of IEEE.