Other topics

In addition to the mentioned topics, various subjects are being studied in the research lab. Examples include multiple access, UAV (Unmanned aerial vehicle), and ISAC (Integrated sensing and communications )

Multiple access

In the realm of communication technology, innovative techniques such as Non-Orthogonal Multiple Access (NOMA), Space Division Multiple Access (SDMA), and Rate-Spitting Multiple Access (RSMA) are reshaping connectivity paradigms. NOMA enhances spectral efficiency by allowing multiple users to share the same frequency band and time slot, leveraging the power domain for improved throughput. SDMA utilizes spatial dimension, employing advanced antenna arrays and beamforming techniques to serve multiple users simultaneously within the same geographic area, thereby maximizing spectral efficiency and minimizing interference. RSMA introduces dynamic resource allocation, combining frequency, time, and spatial domain allocation to adaptively assign resources in real-time, ensuring fairness and quality of service for all users. Together, these advanced multiple access techniques are driving the evolution of communication networks, enabling more efficient and robust connectivity solutions.

Recent publications

• J. Park, B. Lee, J. Choi, H. Lee, N. Lee, S. Park, K. Lee, J. Choi, S. H. Chae, S. Jeon, K. S. Kwak, B. Clerckx, and W. Shin, "Rate-Splitting Multiple Access for 6G Networks: Ten Promising Scenarios and Applications," accepted to IEEE Network, Oct. 2023.

UAV (Unmanned aerial vehicles)

Unmanned aerial vehicle (UAV) communication systems are in active study due to their various applications. UAVs can adjust altitude to efficiently serve as communication base stations across diverse terrains. This mitigates terrain constraints, expanding communication coverage and enhancing signal strength and stability. Moreover, employing UAVs for communication enables rapid response in emergency situations. Our research is dedicated to enhancing the reliability and stability of communication systems via UAVs. This includes secure communications, improving energy efficiency for extending flight time, etc.

Recent publications

• J. Park, K. Kang, J. Choi*, "K-Means Clustering-Aided Power Control for UAV-Enabled OFDM Networks," accepted to IEEE Access, Jan. 2024.

• H. Cho and J. Choi*, "Energy Minimization for UAV Communication Systems Assisted with Multiple IRSs," Journal of Communications and Networks (JCN), vol. 24, no. 5, pp. 566-578, Oct. 2022. 

• J. Park, K. Kang, and J. Choi*, "Low-Complexity Algorithm for Outage Optimal Resource Allocation in Energy Harvesting-Based UAV Identification Networks," IEEE Communications Letters (COMML),  vol. 25,  no. 11, pp. 3639-3643,  Nov. 2021.

ISAC (Integrated sensing and communications)

Among the many visionary assumptions about beyond 5G and 6G networks, a common theme is that sensing will play a more important role than before. Accordingly, researches on ISAC (Integrated Sensing and Communication), which refers to the seamless integration of sensing functions into communication systems, are actively underway. ISAC is expected to considerably improve spectral and energy efficiencies, while reducing both hardware and signaling costs, since it attempts to merge sensing and communication into a single system, which previously competed over various types of resources. This integration increases awareness of surrounding conditions, enabling applications such as environmental monitoring, surveillance, medical monitoring, and smart infrastructure management.

Recent publications

• G. Han, J. Choi*, and R. W. Heath Jr., "Radar Imaging Based on IEEE 802.11ad Waveform in V2I Communications," IEEE Transactions on Signal Processing (TSP), vol. 70, pp.  4981 - 4996, Oct. 2022.