英国Essex大学Zilong Liu博士学术报告

来源:信息科学与技术学院  作者:范平志  日期:2019-12-22  点击数:319
西南交通大学创源大讲堂
Innovative Source Lecture Hall, Southwest Jiaotong University
无线通信与信息编码前沿系列讲座
Lecture Series: Frontiers in Wireless Communications & Information Coding

报告题目(Title):  New Results on Code-Domain Non-Orthogonal Multiple Access (NOMA)
报告专家(Speaker): Dr Zilong Liu, University of Essex, UK
报告时间(Time):25 December 2019, 4:30-5:30pm (Wednesday)
报告地点(Venue):2F Meeting Rm, CSNMT Int Centre, SWJTU (犀浦校区CSNMT国际合作中心二楼会议室)
主持人(Chair):  Professor FAN, Pingzhi(范平志)

内容提要(Outline of the Talk):

New Results on Code-Domain Non-Orthogonal Multiple Access (NOMA)
Code-domain non-orthogonal multiple-access (NOMA) is an enabling paradigm for massive connectivity in 5G machine-type networks. An emerging code-domain NOMA is called sparse code multiple access (SCMA) whose original idea was invented by researchers in University of Surrey. New results on code-domain NOMA will be presented aiming to answer the following two fundamental questions: (1) How to design “universally good” SCMA codebooks such that excellent error rate performances can be achieved in both uplink and downlink Rayleigh fading channels? Despite numerous SCMA codebook proposals in the literature, existing codebook design is mostly carried out channel by channel, meaning that a good codebook for downlink channel may have poor performance in uplink and vice versa. (2) Sparse or dense, how to select and design codebooks for significantly enhanced NOMA systems?  It will be pointed out that the maximum diversity order of any SCMA system only equals to the sparsity given to each user (i.e., the effective number of resource nodes occupied by each user). This fundamentally limits the performance of SCMA systems, regardless of any sparse codebook and/or any advanced receiver. A detailed comparison of SCMA and dense code multiple access (DCMA) will be presented.

报告人简介(Short Biography of the Speaker):

Zilong Liu is a Lecturer at the School of Computer Science and Electronic Engineering, University of Essex. From January 2018 to November 2019, he was a Senior Research Fellow at the Institute for Communication Systems (ICS), Home of the 5G Innovation Centre (5GIC), University of Surrey. Prior to his career in UK, he spent 9.5 years in the School of Electrical and Electronic Engineering, Nanyang Technological University (NTU), Singapore, first as a Research Associate (since July 2008) and then a Research Fellow (since November 2014). He received his PhD in June 2014 wi
th a thesis entitled ``Perfect- and Quasi- Complementary Sequences" advised by Prof. Guan Yong Liang. He received his M.S. degree in the Department of Electronic Engineering from Tsinghua University and B.S. degree in the School of Electronics and Information Engineering from Huazhong University of Science and Technology (HUST), in 2007 and 2004, respectively. He is generally interested in coding and signal processing for various communication systems. Details of his research can be found at: https://sites.google.com/site/zilongliu2357. (Note: Scholars who intend to visit Zilong under CSC funding is highly encouraged to contact with him through zilong.liu@essex.ac.uk.).