A5102781968- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Technologies
- Cooperative Communication and Network Coding
- Energy Harvesting in Wireless Networks
- Antenna Design and Analysis
- Cognitive Radio Networks and Spectrum Sensing
- Wireless Communication Security Techniques
- Satellite Communication Systems
- Advanced Wireless Communication Techniques
- Distributed Sensor Networks and Detection Algorithms
- Wireless Communication Networks Research
- Full-Duplex Wireless Communications
- UAV Applications and Optimization
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Optical Wireless Communication Technologies
- Millimeter-Wave Propagation and Modeling
- IoT Networks and Protocols
- Energy Efficient Wireless Sensor Networks
- Interconnection Networks and Systems
- Wireless Body Area Networks
- Indoor and Outdoor Localization Technologies
- IoT and Edge/Fog Computing
- Advanced Wireless Network Optimization
- Radar Systems and Signal Processing
Korea University
2019-2025
Konkuk University
2024
ORCID
2021
Sejong University
2021
Yeungnam University
2013-2019
Electronics and Telecommunications Research Institute
1999-2017
Guangxi Science and Technology Department
2014
Korea Advanced Institute of Science and Technology
2008-2011
Next Generation Technology (United States)
2006
In this paper, emerging 5G mobile services are investigated and categorized from the perspective of not service providers, but end-users. The development is based on an intensive analysis global trends in services. Additionally, several indispensable requirements, essential for realizing scenarios presented, described. To illustrate changes societies daily life era, five megatrends, including explosion data traffic, rapid increase connected devices, everything cloud, hyper-realistic media...
Recently, the Internet of Things (IoT) concept has attracted a lot attention due to its capability translate our physical world into digital cyber with meaningful information. The IoT devices are smaller in size, sheer number, contain less memory, use energy, and have more computational capabilities. These scarce resources for powered by small operating systems (OSs) that specially designed support devices' diverse applications operational requirements. OSs responsible managing constrained...
To meet the diverse industrial and market demands, International Telecommunication Union (ITU) has classified fifth-generation (5G) into ultra-reliable low latency communications (URLLC), enhanced mobile broadband (eMBB), massive machine-type (mMTC). Researchers conducted studies to achieve implementation of mentioned distributions efficiently, within available spectrum. This paper aims highlight importance URLLC in accordance with approaching era technology industry requirements. While...
Speech emotion recognition (SER) plays a significant role in human–machine interaction. Emotion from speech and its precise classification is challenging task because machine unable to understand context. For an accurate classification, emotionally relevant features must be extracted the data. Traditionally, handcrafted were used for emotional signals; however, they are not efficient enough accurately depict states of speaker. In this study, benefits deep convolutional neural network (DCNN)...
This paper investigates the physical layer security and data transmission for underlay device-to-device (D2D) networks, considers a combination of reconfigurable intelligent surface (RIS) full-duplex (FD) jamming receiver robustness enhancements system. In demonstrated spectrum sharing setup, total power D2D networks is conceived to transmitter transmit private message emit artificial noise (AN) signals. To prevent information leakage, beamforming design presented multi-antenna FD in order...
Predictably, the upcoming six generation (6G) networks demand ultra-massive interconnectivity comprising densely congested sustainable small-to-tiny networks. The conventional radio access network (RAN) will be redesigned to provide necessary intelligence in all areas meet required flexibility, full coverage, and massive access. In this respect, paper focuses on intelligent RAN (mRAN) architecture key technologies fulfilling requirements. Particularly, we investigate potential artificial...
Millimeter-wave (mm-wave) and sub-terahertz (sub-THz) communications are expected to be one of the biggest beneficiaries emerging reconfigurable intelligent surface (RIS) technology. RISs can compensate for large path loss blockage inherent mm-wave sub-THz frequency bands yield enhanced communication performance in these bands. To achieve high beamforming gain realize RIS-assisted wireless communication, acquisition accurate channel state information (CSI) is critical. In this article, we...
Sixth-generation (6G) networks pose substantial security risks because confidential information is transmitted over wireless channels with a broadcast nature, and various attack vectors emerge. Physical layer (PLS) exploits the dynamic characteristics of environments to provide secure communications, while reconfigurable intelligent surfaces (RISs) can facilitate PLS by controlling transmissions. With RIS-aided PLS, lightweight solution be designed for low-end Internet Things (IoT) devices,...
As the 6th-Generation (6G) wireless communication networks evolve, privacy concerns are expected due to transmission of vast amounts security-sensitive private information. In this context, a Reconfigurable Intelligent Surface (RIS) emerges as promising technology capable enhancing efficiency and strengthening information security. This study demonstrates how RISs can play crucial role in making 6G more secure against eavesdropping attacks. We discuss fundamentals standardization aspects...
In this correspondence, the problem of interference alignment for <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> -user time-invariant multi-input multi-output channels is considered. The necessary and sufficient conditions are converted to a system linear equations that have dummy variables. Based on system, new algorithm beam design proposed by minimizing overall xmlns:xlink="http://www.w3.org/1999/xlink">interference misalignment</i> ....
In air-to-ground communications, the network lifetime depends on operation time of unmanned aerial vehicle-base stations (UAV-BSs) owing to restricted battery capacity. Therefore, maximization energy efficiency and minimization outage ground users are important metrics performance. To achieve these two objectives, location transmit power UAV-BSs in must be optimized. This optimization problem may not tractable conventional framework because multiple interact a complicated manner. Hence, we...
An unmanned aerial vehicle-mounted base station (UAV-BS) is a promising technology for the forthcoming sixth-generation wireless networks, owing to its flexibility and cost effectiveness. Besides, limited network operation time of UAV-BS networks can be overcome with concept tethered vehicles (TUAVs), which are powered from an energy source in ground. Along this trend, optimal deployment (i.e., trajectory control) TUAVs maximize throughput multicell environments has been studied. As problem...
Abstract Internet of Things (IoT) vision has astoundingly transcended environmental sensing with integrated computing systems and smart devices, providing seamless connectivity among humans, machines, their environment to cooperate for convenience economical benefits. Apart from all the tremendous benefits IoT, this paradigm still suffers challenges security privacy vulnerabilities demands a secure system effective utilization services in real-world IoT scenarios relying on which consumers...
With the rapid evolution of communication technologies, high-speed optical wireless applications under water surface as a replacement or complementary to conventional radio frequency (RF) and acoustic technologies are attracting significant attention from researchers. Since underwater turbulence (UWT) is an inevitable impediment for long distance (UOWC) link, mixed RF-UOWC being considered more feasible solution by research community. This article deals with secrecy performance variable gain...
This paper investigates the reconfigurable intelligent surface (RIS)-empowered dynamic power splitting designs for simultaneous wireless information and transfer (SWIPT) systems while adopting various practical hardware issues. Specifically, we adopt physical size of RIS placement plane to phase-align reflected signals towards desired direction. The analytical phase shift model reflecting elements is presented characterize an intertwined relationship between amplitude responses, which...
Reconfigurable intelligent surfaces (RISs) have been considered as a promising technology for the sixth-generation (6G) wireless networks that can control channels in desirable way and significantly enhance network performance. Simultaneous transmitting reflecting-RISs (STAR-RISs) overcome limitation of reflecting-only RISs by leveraging higher design flexibility full-space coverage. Despite benefits, modeling analysis STAR-RISs are complicated because various parameters both transmission...
Recently, megaconstellations with a massive number of low Earth orbit (LEO) satellites are being considered as possible solution for providing global coverage due to relatively latency and high throughput compared geosynchronous (GEO) satellites. However, the operators participating in LEO constellation increases, inter-satellite interference will become more severe, which may yield marginal improvement or even decrement network throughput. In this article, we introduce concept satellite...