A5022820503- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Techniques
- Wireless Communication Networks Research
- Cooperative Communication and Network Coding
- Advanced Wireless Network Optimization
- Satellite Communication Systems
- Antenna Design and Analysis
- PAPR reduction in OFDM
- Telecommunications and Broadcasting Technologies
- Underwater Vehicles and Communication Systems
- Error Correcting Code Techniques
- Vehicular Ad Hoc Networks (VANETs)
- Energy Harvesting in Wireless Networks
- Antenna Design and Optimization
- Digital Filter Design and Implementation
- UAV Applications and Optimization
- Power Line Communications and Noise
- Advanced Wireless Communication Technologies
- Advanced Adaptive Filtering Techniques
- Speech and Audio Processing
- IoT Networks and Protocols
- Video Surveillance and Tracking Methods
- Full-Duplex Wireless Communications
- Traffic control and management
- Robotic Path Planning Algorithms
Inha University
2016-2025
Marvell (United States)
2025
Michigan State University
2010
Electronics and Telecommunications Research Institute
1994-2008
Texas A&M University
1992-2007
Yonsei University
2007
A loss of subchannel orthogonality due to time-variant multipath channels in orthogonal frequency division multiplexing (OFDM) systems leads interchannel interference (ICI) which increases the error floor proportion Doppler frequency. simple frequency-domain equalization technique can compensate for effect ICI a fading channel is proposed. In this technique, received OFDM signal achieved by using assumption that impulse response (CIR) varies linear fashion during block period and...
The development of drones has captured the attention hobbyists and investors alike; now have greater commercial military applications owing to their relatively small size ability fly without an on-board pilot. However, certain drone may pose serious threats public safety. most important problem be addressed is recognition in security-sensitive areas. This paper presents approach recognize through sounds emitted by propellers using Mel frequency cepstral coefficients (MFCCs) technique for...
The use of the unmanned aerial vehicle (UAV) has been regarded as a promising technique in both military and civilian applications. However, due to lack relevant laws regulations, misuse illegal drones poses serious threat social security. In this paper, we develop trajectory planner based on particle swarm optimization proposed surveillance area importance updating mechanism aimed at deriving three-dimensional (3D) optimal trajectories for multiple monitoring drones. We also propose...
Collision-free distributed path planning for the swarm of unmanned aerial vehicles (UAVs) in a stochastic and dynamic environment is an emerging challenging subject research field communication system. Monitoring methods approaches multi-UAVs with full area surveillance needed both military civilian applications, order to protect human beings infrastructure, as well their social security. To perform multiple vehicles, we propose trajectory planner based on Particle Swarm Optimization (PSO)...
Interest in the study of next-generation underwater sensor networks for ocean investigations has increased owing to developing concerns over their utilization areas such as oceanography, commercial operations maritime areas, and military surveillance. Underwater acoustic communications (UAC) network channels are fast-varying (spatially temporally) according environmental conditions. It is tempting use adaptive modulation coding (AMC) UAC improve system efficiency by matching transmission...
In recent years, improving intersection traffic safety has become a major focus for researchers. However, it remains significant concern due to the increasing number of vehicles and introduction autonomous cooperative driving systems. Advancements in artificial intelligence (AI) vehicle-to-everything (V2X) technologies offer promising solutions reduce collisions between vehicles. As V2X are slowly being integrated into systems, questions arise about their impact on effectiveness. This...
In this paper, an adaptive data predistortion technique which can compensate for the nonlinear effect of a TWT high-power amplifier (HPA) in orthogonal frequency-division multiplexing (OFDM) systems is proposed. It shown that convergence time and MSE predistorter be significantly reduced by using broadcasting designing appropriate training signals.
Lane detection is a significant technology for autonomous driving. In recent years, number of lane methods have been proposed. However, the performance fast and slim not satisfactory in sophisticated scenarios some robust are enough. Consequently, we proposed method by combining semantic segmentation network an optical flow estimation network. Specifically, whole research was divided into three parts: segmentation, discrimination, mapping. terms to segment key frames used track non-key...
Non-terrestrial network (NTN) systems can offer wide area coverage for applications requiring high mobility, which is expected in the sixth generation (6G) of telecommunication systems. This paper proposes a high-mobility support system based on 5G-NR physical layer components NTN connectivity. In this paper, we propose optimization numerologies and impact various modulation coding schemes (MCS), 3GPP NR-NTN channel models, MIMO/beamforming with link-level simulation under pilot-aided-based...
A frontier challenge in implementing femtosecond electron microscopy is to gain precise optical control of intense beams mitigate collective space charge effects for significantly improving the throughput. Here, we explore flexible uses an RF cavity as a longitudinal lens high-intensity beam column condensing both temporally and spectrally, relevant design ultrafast microscopy. Through introduction novel atomic grating approach characterization bunch phase optics, elucidate principles...
Abstract This paper addresses issues with monitoring systems that identify and track illegal drones. The development of drone technologies promotes the widespread commercial application However, ability a to carry explosives other destructive materials may pose serious threats public safety. In order reduce these threats, we propose an acoustic-based scheme for positioning tracking Our proposed has three main focal points. First, scan sky switched beamforming find sound sources record sounds...
In the Republic of Korea, a Long Term Evolution (LTE)-based public safety (PS)-LTE network is being built using 718~728 MHz for uplink and 773~783 downlink. However, same bands are also assigned to LTE-based high-speed railway (LTE-R) network, so great concerns practical researches on co-channel interference (CCI) management schemes urgently required. this paper, performance analyzed evaluated by considering cases non-RAN (radio access network) sharing LTE-R RAN PS-LTE user equipments (UE)....
In the rapidly evolving landscape of 5G-NR-V2X communication systems, demand for efficient and adaptive power control mechanisms is paramount to address challenges posed by high-density vehicular environments. This paper introduces sidelink open loop (AS-OLPC) algorithm as a pioneering solution. The primary objective enhance vehicle-to-vehicle (V2V) reliability through real-time signal-to-interference-plus-noise ratio (SINR) estimation, interference level measurements, dynamic adjustments....
Direct sequence (DS) code-division multiple-access (CDMA) is a modulation and multiple access technique currently being implemented in digital cellular mobile radio communication systems. The conventional quasisynchronous (QS) DS-CDMA system generalized, the problem of optimal spreading pseudonoise (PN) design for new QS systems formulated. classes PN sequences which have good pseudo-randomness very small cross-correlation values some range offsets are designed by using matrix-based...
In terrestrial wireless communications, high data-rate transmission can be readily achieved by installing base stations on the ground. However, same system may not adapted to maritime communication due geographically restricted nature of sea, and therefore, MF/HF modems, capable long-distance transmission, with low are frequently employed in communication. Maritime satellite through Inmarsat is conventionally used compensate for but its cost still remains as a main drawback. order enhance...
Cellular-based vehicle-to-everything (C-V2X) is one of the emerging and promising techniques to support vehicular communications by enabling both safety-critical non-safety services. C-V2X a core solution manage advance future traffic safety mobility. In this paper, we design cellular-based vehicle-to-infrastructure (V2I) model for Manhattan dense urban environment that has many roads deployed in cell edge region, which results severe co-channel interference (CCI). Thus, aim utilize two...
Cooperative relaying permits one or more relay to transmit a signal from source destination, thereby increasing network coverage and spectral efficiency. The performance of cooperative is often measured as outage probability. However, appropriate measure for the channel quality capacity. Although probability protocol has been analyzed before, very little research addressed This paper first its kind in which we derive closed-form analytical solution capacity using fixed decode forward amplify...
In this paper, we analyze the performance of encoding and modulation processes in downlink uplink EPCglobal Gen2 system through analysis simulation. Furthermore, synchronization issues on time frequency domain preamble architecture are evaluated. Through simulation uplink, find that detection probability FM0 Miller coding approaches 1 at 13 dB E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> /N...
In a 3rd Generation Partnership Project Long Term Evolution-Advanced (3GPP LTE-A) uplink, user equipment (UE) has maximum transmission power limit defined by the UE class. Generally, cell edge higher probability to be constrained level owing compensation of large pathloss. When is level, allocating number physical resource blocks (PRBs) than capability can afford will reduce allocated per PRB, resulting in inefficient use resources. To avoid this inefficiency, uplink controlled according...
In recent years, the development of drone technologies has promoted widespread commercial application drones.However, ability to carry explosives and other destructive materials may bring serious threats public safety.In order reduce these from illegal drones, acoustic feature extraction classification are introduced for sound identification.In this paper, we introduce vector method harmonic line association (HLA), subband power based on wavelet packet transform (WPT).We propose a combined...
Block diagonalization (BD) is an attractive technique that transforms the multi-user multiple-input multiple-output (MU-MIMO) channel into parallel single-user MIMO (SU-MIMO) channels with zero inter-user interference (IUI). In this paper, we combine BD two deterministic vector perturbation (VP) algorithms reduce transmit power in MU-MIMO systems linear precoding. These techniques are fixed-complexity sphere encoder (FSE) and QR-decomposition M-algorithm (QRDM-E). contrast to conventional VP...
For the purpose of providing high data rate real-time services, radio transmission technologies for ship ad-hoc network are designed in this paper. Based on Recommendation ITU-R 1842–1, physical layer parameters SANET contrived to meet requirements that specification. Furthermore, multi-hop frame structure is proposed and link-level system performances evaluated based parameters. Under measured maritime channel environment, simulation results show not only BER comparisons, but also optimal...