16:00 - 18:00
Dr Zilong Liu
Lectures, talks and seminars
CSEE Seminar Series
Computer Science and Electronic Engineering, School of
CSEE School Office firstname.lastname@example.org
Sparse code multiple access (SCMA) is an enabling multiple access technique for massive connectivity in 5G communication.
By exploiting the sparsity of codebook structure using the efficient belief propagation algorithm, SCMA tends to achieve error rate performance approaching to that of the maximum-likelihood receiver.
That being said, the maximum diversity order of any SCMA system is less than the effective number of resource nodes given to each user. This fundamentally limits the performance enhancement of SCMA systems, regardless of any sparse codebook and/or any advanced receiver. To attain enhanced massive connectivity, it is interesting to ask: how can we select codebooks for overloaded multiuser communication system?
In this talk, Dr Liu will first review the state-of-the-art of SCMA, focusing on its codebook design rules, methodologies, and performance analysis. Then, he will introduce a class of dense codebooks (designed from certain advanced algebraic tools) which is capable of achieving full diversity order in fading channels. Simulations show that such dense codebooks lead to significantly improved error rate performance over SCMA systems.
Dr Zilong Li is a Senior Research Fellow in the 5G Innovation Centre, University of Surrey. Dr Liu received his PhD (advised by Prof Guan Yong Liang) in 2014 from the School of Electrical & Electronics Engineering, Nanyang Technological University (NTU), Singapore. 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.
Dr Li has co-authored 34 journal papers on coding and signal processing for communication systems, mostly in IEEE, including 17 IEEE Transactions papers (5 in IEEE Transactions on Information Theory as the first author).