Seminar Series

Upcoming Seminar


  • TBD

PAST Seminars


  • Seminar 4 on 16 November 2022
  • Title: Next Generation Multiple Access – New Challenges and New Opportunities
  • Speaker: Dr. Peiying Zhu [Video]
  • Abstract: The next generation of wireless communication network requires continuous evolutions of multiple access (MA) techniques due to the demand on ubiquitous connections of every things besides humans. In 5G system, many potential MA techniques have been considered. For example, non-orthogonal multiple access (NOMA) have been discussed deeply as a sophisticated method by sharing the access resources to accommodate more users compared with the traditional orthogonal way. And grant free mechanism including configured grant and 2-Step RACH have been successfully promoted to NR standard as an efficient way which can reduce the access latency and the signaling overhead. All of these techniques still need to be evolved with combination of new frequency bands, more advanced MIMO techniques, as well as novel AI technologies, to fulfil the requirements of multiple access for 6G scenarios, such as critical MTC connections for industrial applications, super-massive connections with low cost devices, ubiquitous connectivity with integrated non-terrestrial networks (NTN), as well as high-efficient multiple access for mixed services. Moreover, as Network Sensing and Network AI are becoming the typical beyond communication new usage scenarios of the future mobile networks, new multiple access paradigm might be needed for such task oriented communications. In this talk, we will discuss the potential new challenges, new requirements, and new opportunities for the next generation multiple access in these new scenarios.

  • Seminar 3 on 24 May 2022
  • Title: Stochastic Multi-Armed Bandit With Knapsack and It’s Application to Distributed AP/Server Selection Problem
  • Speaker: Prof. Ekram Hossain [Video]
  • Abstract: Multi-armed bandits (MAB) is a popular sequential decision making technique ideal for decision making under uncertainty given no prior knowledge of the environment. It uses the history of previous decisions and observations as well as side information, if available, to arrive at the current decision. The classic MAB algorithm such as the upper confidence bound (UCB) algorithm concerns with learning the single optimal action among a set of candidate actions with unknown rewards. Different from traditional bandits, bandits with knapsacks (BwK) can model more sophisticated distributed decision-making problems under global constraints. Starting with the basics of stochastic MAB models and the UCB algorithm, in this talk, I shall discuss a BwK model and show it’s application to the distributed access point (AP) or server selection problem. Time permitting, I will also discuss a linear contextual bandit with knapsack model for the same problem.

  • Seminar 2 on 18 Mar. 2022
  • Title: Asynchronous Non-Orthogonal Multiple Access (ANOMA)
  • Speaker: Prof. Hamid Jafarkhani [Video]
  • Abstract: Non-orthogonal multiple access (NOMA) is one of the key potential technologies to meet the challenges of the next generation wireless communications. NOMA allows different users to share the same time and frequency resources. In this talk, we introduce asynchronous NOMA (ANOMA) and study the benefits of intentionally adding symbol-level timing mismatch in both downlink and uplink NOMA. We analyze the rate-region provided by the asynchronous transmission and derive the corresponding theoretical capacity-regions for a wide range of pulse shaping methods. Our analysis shows that asynchronous transmission enlarges the rate-region. Furthermore, we provide practical transceiver designs that can achieve a rate pair that is not achievable by the synchronous transmission. We also apply ANOMA principles in different scenarios including multiuser transmit beamforming, systems with limited feedback, and cooperative communication to name a few.

  • Seminar 1 on 14 Jan. 2022
  • Title: Recent Advances in Non-Orthogonal Multiple Access in 6G Wireless Networks
  • Speaker: Prof. Zhiguo Ding [Video]
  • Abstract: With the current rollout of 5G, the focus of the research community is shifting towards the design of the next generation of mobile systems, e.g., 6G mobile networks. Non-orthogonal multiple access (NOMA) has been recongized as an essential enabling technology for the forthcoming 6G networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The principle of NOMA is to encourage users for spectrum sharing, where multiple users are served in the same resource block, such as a time slot, subcarrier, or spreading code. The aim of this talk is to provide an overview of the latest research results and innovations in NOMA technologies as well as their emerging applications, including machine learning, intelligent reflecting surfaces (IRS), mobile edge computing (MEC), backscattering communication (BacCom), etc. Future research challenges regarding NOMA in B5G and 6G are also presented.