RPG Seminar – Massive Access in Secure NOMA under Imperfect CSI: Security Guaranteed Sum-Rate Maximization with First-Order Algorithm
Date:
18 Mar, 2021 (Thu)
Time:
3:00 pm
Webinar Link:
https://hku.zoom.us/j/95066561290?pwd=dkM5dVJwN1EzTmhZemZhSFFsakFldz09

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Speaker

Mr. Zongze Li,
Department of Electrical and Electronic Engineering
The University of Hong Kong

Abstract

Non-orthogonal multiple access (NOMA) is a promising solution for secure transmission under massive access. However, in addition to the uncertain channel state information (CSI) of the eavesdroppers due to their passive nature, the CSI of the legitimate users may also be imperfect at the base station due to the limited feedback. Under both channel uncertainties, the optimal power allocation and transmission rate design for a secure NOMA scheme is currently not known due to the difficulty of handling the probabilistic constraints. This paper fills this gap by proposing novel transformation of the probabilistic constraints and variable decoupling so that the security guaranteed sum-rate maximization problem can be solved by alternatively executing branch-and-bound method and difference of convex programming. To scale the solution to a truly massive access scenario, a first-order algorithm with very low complexity is further proposed. Simulation results show that the proposed first-order algorithm achieves identical performance to the conventional method but saves at least two orders of magnitude in computation time. Moreover, the resultant transmission scheme significantly improves the security guaranteed sum-rate compared to the orthogonal multiple access transmission and NOMA ignoring CSI uncertainty.

 

Zoom Link (during COVID-19 special period):
https://hku.zoom.us/j/95066561290?pwd=dkM5dVJwN1EzTmhZemZhSFFsakFldz09
Meeting ID: 950 6656 1290
Password: 762105

 

Biography of the speaker:

Zongze Li received the B.E. and M.Phil. degrees from Xian Jiaotong University, Xian, China, in 2014 and 2017, respectively. He is currently pursuing the Ph.D. in Electrical and Electronic Engineering, at the University of Hong Kong. His research interests include signal processing techniques and in the general areas of wireless communications.

 

All are welcome.


Organizer

Dr. Y.C. Wu

Most seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 3917 7093
Email: seminar@eee.hku.hk