• Advanced Institute of Engineering and Technology (AVITECH)

  • Seminars

    August 27, 2019: Mr. Ngo Khac Hoang (Univ. Paris-Saclay, France), Constellation Design for Non-coherent Communications in SIMO Block-Fading Channel

    The communication without a priori channel state information is called non-coherent communication. For the non-coherent Rayleigh block-fading channel, it was shown that the optimal signaling is to encode information in the subspace of the signal matrix in the space-time domain. Therefore, a constellation for this channel can be designed as a collection of subspaces. Such constellations belong to the Grassmann manifold, which is the space of subspaces, and thus are called Grassmannian constellations. In this talk, we focus on the single-transmit-antenna (SIMO) case. We first present the optimality of Grassmannian signaling and the constellation design criteria. Then, we introduce a practical Grassmannian constellation so-called the cube-split constellation. This constellation is constructed with a structure that facilitates low-complexity symbol decoder and bit log-likelihood computation while achieving a high packing efficiency. Numerical results show that the performance of the cube-split constellation is close to that of a numerically optimized constellation, and better than other structured constellations. It also outperforms a coherent pilot-based scheme in the case of short coherence time and large constellation size.

    Speaker: Mr. Ngo Khac Hoang, Univ. Paris-Saclay

    Time: 15:30, Tuesday, August 27, 2019

    Venue: G2-315, 144 Xuan Thuy, Cau Giay, Hanoi


    Ngô Khắc Hoàng received the B.E. degree in electronics and telecommunications from the University of Engineering and Technology, Vietnam National University, Hanoi, Vietnam, in 2014, and the M.Sc. degree in advanced wireless communication systems (Master SAR) from CentraleSupélec, Université Paris-Saclay, France, in 2016, both with first-class honors. He is currently pursuing the Ph.D. degree in CentraleSupélec and Mathematical and Algorithmic Sciences Lab, Huawei Technologies, France under the supervision of Prof. Sheng Yang and Dr. Maxime Guillaud. His thesis topic is non-coherent wireless communications. His research interests include multi-antenna communication systems, coded caching, and network coding. He received the Honda Award for Young Engineers and Scientists, Honda Y-E-S Award, in Vietnam, in 2013.


    February 2, 2024: Dr. Khoa D. Doan (Vin Univeristy) Toward Reliable and Practical Machine Learning Applications

    While Machine Learning (ML) has rapidly transformed several domains and applications with incredible successes, there are also important areas where the progress is significantly slower. Specifically, there exists a widened complexity gap between the methods currently investigated in research and those used in practice in these areas. One reason is that many algorithms, despite achieving […]

    February 2, 2024: Prof. Heng Ji (University of Illinois at Urbana-Champaign), Combating with Misinformation and Cancer: A Unified Multimodal AI Approach to Healthy and Happy Life

    A research overview of ongoing research projects, especially focusing on two that are most related to the VinUni-UIUC Smart Health Center: (1) Misinformation Detection and Trustworthy Large Language Models; (2) Joint Natural Language and Molecule Learning for Drug Discovery. Unsurprisingly these two seemingly different research problems can be tackled with a unified approach based on […]

    January 11, 2024: Dr. Le Duc Trong (FIT-UET) Resilient Multimodal Learning for Multimodal Emotion Recognition in the Presence of Incomplete Modalities

    Multimodal Emotion Recognition in Conversation (Multimodal ERC) is a critical area of research for interpreting human communication in diverse applications. Nevertheless, the persistent issue of uncertain missing modalities poses a major hurdle, hampering the development of robust Multimodal ERC models. Existing approaches face limitations in effectively leveraging a fusion of diverse data modalities encompassing audio, […]