Search Results for author: Ju-Hyung Lee

Found 9 papers, 2 papers with code

Integrating Pre-Trained Language Model with Physical Layer Communications

1 code implementation18 Feb 2024 Ju-Hyung Lee, Dong-Ho Lee, Joohan Lee, Jay Pujara

The burgeoning field of on-device AI communication, where devices exchange information directly through embedded foundation models, such as language models (LMs), requires robust, efficient, and generalizable communication frameworks.

Language Modelling

Interference-Aware Emergent Random Access Protocol for Downlink LEO Satellite Networks

no code implementations4 Feb 2024 Chang-Yong Lim, Jihong Park, Jinho Choi, Ju-Hyung Lee, Daesub Oh, Heewook Kim

In this article, we propose a multi-agent deep reinforcement learning (MADRL) framework to train a multiple access protocol for downlink low earth orbit (LEO) satellite networks.

reinforcement-learning

A Scalable and Generalizable Pathloss Map Prediction

1 code implementation6 Dec 2023 Ju-Hyung Lee, Andreas F. Molisch

Large-scale channel prediction, i. e., estimation of the pathloss from geographical/morphological/building maps, is an essential component of wireless network planning.

Transfer Learning

Handover Protocol Learning for LEO Satellite Networks: Access Delay and Collision Minimization

no code implementations31 Oct 2023 Ju-Hyung Lee, Chanyoung Park, Soohyun Park, Andreas F. Molisch

This study presents a novel deep reinforcement learning (DRL)-based handover (HO) protocol, called DHO, specifically designed to address the persistent challenge of long propagation delays in low-Earth orbit (LEO) satellite networks' HO procedures.

Simple and Effective Augmentation Methods for CSI Based Indoor Localization

no code implementations19 Nov 2022 Omer Gokalp Serbetci, Ju-Hyung Lee, Daoud Burghal, Andreas F. Molisch

We also showed that if we further augment the dataset with the proposed techniques, test accuracy is improved more than three-fold.

Data Augmentation Indoor Localization

Seq2Seq-SC: End-to-End Semantic Communication Systems with Pre-trained Language Model

no code implementations27 Oct 2022 Ju-Hyung Lee, Dong-Ho Lee, Eunsoo Sheen, Thomas Choi, Jay Pujara

In this work, we propose a realistic semantic network called seq2seq-SC, designed to be compatible with 5G NR and capable of working with generalized text datasets using a pre-trained language model.

Language Modelling Semantic Similarity +1

Learning Emergent Random Access Protocol for LEO Satellite Networks

no code implementations3 Dec 2021 Ju-Hyung Lee, Hyowoon Seo, Jihong Park, Mehdi Bennis, Young-Chai Ko

A mega-constellation of low-altitude earth orbit (LEO) satellites (SATs) are envisaged to provide a global coverage SAT network in beyond fifth-generation (5G) cellular systems.

Fairness

Integrating LEO Satellites and Multi-UAV Reinforcement Learning for Hybrid FSO/RF Non-Terrestrial Networks

no code implementations20 Oct 2020 Ju-Hyung Lee, Jihong Park, Mehdi Bennis, Young-Chai Ko

Lastly, thanks to utilizing hybrid FSO/RF links, the proposed scheme achieves up to 62. 56x higher peak throughput and 21. 09x higher worst-case throughput than the cases utilizing either RF or FSO links, highlighting the importance of co-designing SAT-UAV associations, UAV trajectories, and hybrid FSO/RF links in beyond-5G NTNs.

Dimensionality Reduction Reinforcement Learning (RL)

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