6 papers
Extended Universal Joint Source-Channel Coding for Digital Semantic Communications: Improving Channel-Adaptability
Eunsoo Kim, Yoon Huh, Wan Choi
Deep learning (DL)-based joint source--channel coding (JSCC), particularly vector quantization (VQ)-based JSCC, enables efficient semantic communication by mapping high-dimensional…
DFT-based Near-field Beam Alignment: Model-based and Data-Driven Hybrid Approach
Hongjun Heo, Wan Choi
Accurate beam alignment is a critical challenge in XL-MIMO systems, especially in the near-field regime, where conventional far-field assumptions no longer hold. Although 2D grid-b…
Weighted-Sum Energy Efficiency Maximization in User-Centric Uplink Cell-Free Massive MIMO
Donghwi Kim, Liesbet Van der Perre, Wan Choi
This paper introduces the weighted-sum energy efficiency (WSEE) as an advanced performance metric designed to represent the uplink energy efficiency (EE) of individual user equipme…
Graph Neural Network based Active and Passive Beamforming for Distributed STAR-RIS-Assisted Multi-User MISO Systems
Ha An Le, Trinh Van Chien, Wan Choi
This paper investigates a joint active and passive beamforming design for distributed simultaneous transmitting and reflecting (STAR) reconfigurable intelligent surface (RIS) assis…
Analog-Digital Beam Focusing for Line of Sight Wide-Aperture MIMO with Spherical Wavefronts
Jiyoung Yun, Hojun Rho, Wan Choi
Enhancing high-speed wireless communication in the future relies significantly on harnessing high frequency bands effectively. These bands predominantly operate in line-of-sight (L…
Adversarial Attacks and Defenses in 6G Network-Assisted IoT Systems
Bui Duc Son, Nguyen Tien Hoa, Trinh Van Chien +4
The Internet of Things (IoT) and massive IoT systems are key to sixth-generation (6G) networks due to dense connectivity, ultra-reliability, low latency, and high throughput. Artif…