Hyperentanglement-Assisted Hybrid Quantum Communication
Laboratory Project

The objective of this project is to develop core technologies for hyperentanglement-assisted hybrid quantum communication. To this end, we introduce new concepts of hybrid quantum communication and quantum compression; develop a channel model for hybrid quantum communication; devise quantum modulation/demodulation, quantum source coding, quantum error correcting, and quantum key distribution (QKD) techniques; and finally conduct unified experimentations to verify a quantum communication system.

Foundations for Molecular Communication: Towards Nanonetworks (Adventurous Reserach Program)
Laboratory Project

The objective of this project is to develop core technologies of molecular communication for nanonetworks. To this end, we develop a channel model for molecular communication based on diffusion processes, and devise molecular modulation/demodulation techniques, and molecular coding schemes. We finally conduct biohybrid experimentations to verify a molecular communication system.

Vehicular Network Modeling for Intervehicle Communications
Laboratory Project

The random space-time pattern of vehicle density on a road is one of inevitable uncertainty in design and analysis of a vehicular network. This spatial and temporal (or doubly) stochastic characteristics are largely involved in traffic dynamics. The aim of this project is to model vehicular networks for intervehicle communications.

Foundations for Autonomous Localization: Towards Unifying Cyber and Physical Systems
Laboratory Project (Collaboration with Prof. Moe Win at MIT)

Cyber-physical systems, which tightly combine computational and physical resources, promise to provide numerous future applications in sectors critical to Korea security and competitiveness. One important class of applications, which are physical in nature, involves wireless technologies. These include pervasive computing, sensor networks, and localization. The main impediment to the development of these CPS is the ad-hoc nature of current software implementations tailored for specific physical characteristics, thus reventing the scalability, flexibility, and abstraction of CPS. Wireless localization systems capture all the main characteristics of CPS. Such systems, capable of providing reliable and accurate positional information, are of great importance in numerous commercial, health-care, public safety, and military applications. However, current WLS are highly dependent on specific physical characteristics such as hardware, transmission technologies, and propagation environments. This prevents the development of unifying, adaptive, and comprehensive methodologies. In this project, we will study cooperative WLS as a proving ground for CPS, addressing the Foundation and Methods and Tools in CPS themes.

Network Interference Control and Multiple-Access Channel Coding for Heterogeneous Wireless Networks
Laboratory Project

There has been an ever-growing interest in managing and controling network interference in heterogeneous wireless networks due to their rapid growth and the inherent broadcast nature of wireless media. In particular, since multiple-input multiple-output (MIMO) transmission, cooperative relaying transmission, and cognitive radio networking have become key enabling technologies for advanced wireless networks, we must solidly understand network interference characteristics and devise sophisticated interference control methodology in such networks, taking into account their unique communication features. Along with network interference alignement and suppression schemes at a physical layer, computation coding, which exploits network interference rather than mitigates it, has been of great importance. In this project, we aim to establish network interference modeling and develop key techniques for network interference control and MAC coding for MIMO cooperative relay and cognitive radio networks.

Vehicular Ad Hoc Networks (VANETs) Connectivity
Laboratory project

Vehicular Ad Hoc Networks (VANETs) are special types of Mobile Ad Hoc Networks (MANETs), with mobile nodes being vehicles and Road Side Units (RSUs) as static nodes. This kind of networks are currently concerned by many researchers due to their potential applications which categorized into two groups as comfort applications (traffic information systems, alternative route selection, weather information, mobile internet access, music download) and safety applications (emergency warning systems, collision avoidance). VANETs face the difficulty challenge of maintaining connectivity so that a node may establish a communication link to any other nodes in the network. The connectivity of VANET is affected by several factors including transmitter power, environmental conditions, highly mobility, traffic density, road structure, irregular driving behavior, market penetration. In this project, our goal is to build a model as framework for analysis the connectivity of VANETs.

Physical-Layer Security for Wireless Networks
Laboratory project

Recently, there has been a growing interest in secure information transmission over wireless networks due to their rapid growth and specific security vulnerabilities caused by the inherent openness of wireless media. In addition to standard computational security by cryptograph protocols at the application layer, physical-layer security has been of great importance to design secure wireless networks, which exploits the properties of the physical layer for developing effective secure communication schemes. In this project, we aim to develop key techniques for physical-layer secure wireless communications.


Multihop Relay Digital Fountain MIMO Communication for Next-Generation Wireless Networks
Laboratory project

MIMO communication for maximizing spectral efficiency, cooperative diversity formed by user cooperation, and multihop relaying for enhancements of network coverage and throughput have drawn considerable attention as vital technologies for next-generation high data-rate wireless communications. In this project, we aim to maximize network efficiency for a successful design of multihop relay MIMO cooperative networks, where we optimize key building-block technologies and exploit recently proposed digital fountain channel coding in addition to powerful phyical-layer error control. Digital fountain coding allows to maximize network resource efficiency by correcting erasures occurred in a number of potential receiving paths.