A5089347799- Millimeter-Wave Propagation and Modeling
- Advanced MIMO Systems Optimization
- Electromagnetic Compatibility and Measurements
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Antenna Design and Optimization
- Power Line Communications and Noise
- Energy Harvesting in Wireless Networks
- Electromagnetic Compatibility and Noise Suppression
- Energy Efficient Wireless Sensor Networks
- Telecommunications and Broadcasting Technologies
- Microwave and Dielectric Measurement Techniques
- Indoor and Outdoor Localization Technologies
- Advanced Antenna and Metasurface Technologies
- UAV Applications and Optimization
- Radio Frequency Integrated Circuit Design
- Opportunistic and Delay-Tolerant Networks
- Mobile Ad Hoc Networks
- Radio Wave Propagation Studies
- Advanced Wireless Communication Technologies
- Underwater Vehicles and Communication Systems
- Direction-of-Arrival Estimation Techniques
- Advanced Wireless Communication Techniques
- Electrostatic Discharge in Electronics
- Microwave Imaging and Scattering Analysis
Southeast University
2023-2025
Purple Mountain Laboratories
2025
Xian Yang Central Hospital
2025
University of Oulu
2023-2024
Aalborg University
2015-2024
Shanghai Electric (China)
2024
State Grid Nanjing Power Supply Company (China)
2024
China Academy of Engineering Physics
2016-2024
Zhongnan Hospital of Wuhan University
2024
Wuhan University
2024
With the rapid development and broad applications of unmanned aerial vehicle (UAV) based wireless stations in sky, fundamental understanding characterization realistic air-to-ground (A2G) communication link properties are crucial. In this paper, a UAV-aided channel sounder with real-time processing hardware system is developed for highly dynamic non-stationary A2G measurements. system, global positioning (GPS) -based triggering signal designed, equivalent antenna pattern affected by UAV...
Massive multiple-input, multiple-output (MIMO) is seen as an enabling technology to fulfill dramatic improvements in spectral efficiency for fifth-generation (5G) deployment 2020. For massive MIMO systems, the learning loop from early-stage prototype design final-stage performance validation expected be slow and ineffective. There a strong need evaluate base station (BS) with over-the-air (OTA) methods. Until now, such OTA solutions have not been discussed BS systems.
This paper discusses over-the-air (OTA) testing for multiple-input multiple-output (MIMO) capable terminals with emphasis on channel spatial characteristics emulation. A novel technique to obtain optimum power weights the OTA probes based convex optimization is proposed. The proposed emulates correlation as well introduces constraints maximum deviation between target azimuth spectrum (PAS) and emulated PAS in terms of mean angle arrival (AoA) spread (AS). Simulation results show that...
Accurate characterization of spatial multipath channels at millimeter wave bands has gained significant interest both in industry and academia. A channel measurement was conducted three different frequency bands, i.e., 2−4, 14−16, 28−30 GHz a line-of-sight (LOS) an obstructed-LOS (O-LOS) scenarios empty room environment. vector network analyzer connected to virtual uniform circular array rotational directional horn antenna used the measurements, respectively. Angle-of-arrivals...
Unmanned aerial vehicle (UAV) millimeter wave (mmWave) technologies can provide flexible link and high data rate for future communication networks. By considering the new features of three-dimensional (3-D) scattering space, 3-D velocity, antenna array, especially rotations, a machine learning (ML)-integrated UAV-to-Vehicle (U2V) mmWave channel model is proposed. Meanwhile, an ML-based network parameter calculation generation developed. The deterministic parameters are calculated based on...
Existing deraining methods focus mainly on a single input image. However, with just image, it is extremely difficult to accurately detect and remove rain streaks, in order restore rain-free In contrast, light field image (LFI) embeds abundant 3D structure texture information of the target scene by recording direction position each incident ray via plenoptic camera. LFIs are becoming popular computer vision graphics communities. making full use available from LFIs, such as 2D array sub-views...
Terahertz (THz) communication is considered to be a key enabling technology for 6G due its abundant available spectrum resources. One pre-requisite implementing THz systems understand and model the radio channel in deployment scenarios. However, new characteristics bands (e.g., sparsity, near-field propagation, large-scale antenna configuration) have brought opportunities challenges modeling terms of complexity accuracy. In this work, we aim address these with deterministic ray tracing (RT)...
With the severe spectrum congestion of sub-6 GHz cellular systems, large-scale antenna systems in millimeter-wave (mmWave) bands can potentially meet high data rate envisioned for fifth generation communications. Performance evaluation is an essential step product design and development stage. However, conventional cable conducted test methods are not applicable mmWave devices. There a strong need over-the-air (OTA) radiated methods, where device performance be evaluated reliable,...
Radiated testing of massive multiple-input-multiple-output devices in fading radio-channel conditions is expected to be essential the development fifth-generation (5G) base stations and user equipment (TIE) operating at or close millimeter-wave (mm-wave) frequencies. In this paper, we present a setup upgrading multiprobe anechoic chamber-based system designed originally for 4G TIE. We describe methods mapping models onto probe configuration discuss differences former case. also propose...
Baffles loaded by split-ring resonator (SRR) are proposed to reduce the mutual coupling for ±45° dual-polarized multiple-input-multiple-output (MIMO) antenna. Each baffle consists of two rectangular SRR printed on one side a 1 mm FR4 substrate. The final decoupling structure contains four baffles forming barrier wall that reduces over 5G band 3.4-3.8 GHz. Dual-polarized cross-dipole array with loading is simulated and measured demonstrate their effectiveness in reduction. results show can be...
In this contribution, a recently conducted measurement campaign for indoor millimeter-wave (mm-wave) propagation channels is introduced. A vector network analyzer (VNA)-based channel sounder was exploited to record the characteristics at frequency band from 28-30 GHz. virtual uniform circular array (UCA) with radius of 0.25 m formed using rotator 360 steps. Moreover, by taking advantage fiber-optic technique applied in sounder, measurements 50 positions were performed an hall corridor along...
Recently, intelligent reflecting surface (IRS) has become a research focus for its capability of controlling the radio propagation environments. Compared to conventional terrestrial IRS, aerial IRS (AIRS) exploiting unmanned vehicle (UAV)/high-altitude platform (HAP) can provide better deployment flexibility. To this end, three-dimensional (3D) one-cylinder model is first developed AIRS-assisted multiple-input multiple-output (MIMO) narrowband channels. In order change wireless channel with...
Sub-terahertz (sub-THz) (i.e., 100–300 GHz) communication is envisaged as one of the key building blocks for future systems due to its vast unexploited bandwidth. Knowledge radio channel characteristics design and development new air interfaces. Reliable sounding essential build accurate realistic models. The virtual antenna array (VAA) has been a popular strategy obtain directional characterization low-cost simple system implementation. However, this concept not yet realized sub-THz bands...
Virtual antenna arrays are versatile and cost-effective tools for millimeter-wave channel characterization. Massive sampling of the in space with virtual enables high spatial resolution sounding. In this paper, a uniform cubic array is used vector network analyzer to characterize an indoor propagation channel. The power angle delay profile under line-of-sight (LOS) obstructed-LOS (OLOS) scenarios then extracted from measurement data. analysis extended multi-user scenario using rectangular...
The development of base stations (BSs) with large aperture antenna arrays, enabled partially by the utilization cmWave and mmWave frequency bands, will require radiated testing in fading conditions. In this paper, objective is to investigate suitable measurement distances physical dimensions over-the-air setups for performance evaluation massive multiple-input multiple-output (MIMO) BSs anechoic chambers multiple probes. Setup dimension major cost factor test systems thus key issue be...
This paper discusses virtual drive testing (VDT) for multiple-input multiple-output (MIMO) capable terminals in multi-probe anechoic chamber (MPAC) setups.We propose to perform VDT, via reproducing ray tracing (RT) simulated channels with the field synthesis technique.Simulation results demonstrate that, realistic RT can be accurately reproduced within test zone a limited number of probes MPAC setups.The feasibility performing VDT is supported by measurement practical 3D setup.The amplitude...
Millimeter wave (mm-wave) communication with large-scale antenna array configuration is seen as the key enabler of next generation systems. Accurate knowledge mm-wave propagation channels fundamental and essential. In this contribution, a novel complexity-efficient high resolution parameter estimation (HRPE) algorithm proposed for channel uniform circular (UCA) applied. The able to obtain high-resolution results spherical parameters. prior information in delay domain, i.e., trajectories...
Accurate knowledge of initial complex excitation coefficients for phased-array elements is essential to ensure accurate array performance. In the literature, many calibration algorithms have been proposed this purpose, which generally requires customized phase setting individual shifters connected elements. article, a new method phased operating in beam-steering mode only, that is, shifts are only simultaneously set according directions, and therefore, there no need dedicated element tuning....
Prolonged beam alignment is the main source of overhead in mobile wireless communications at millimeter-wave (mm-wave) frequencies due to narrow beams following requirement high antenna gains. Out-of-band spatial information may be used initial search when lower frequency band radios are operating conjunction with mm-wave radios. The feasibility using low-band channel for coarse estimation high-band directions strongly depends on congruence between two bands. In this work, we try answer...
Reconfigurable intelligent surfaces (RISs) have demonstrated their potential to manipulate properties of radio waves for many applications. Over-the-air (OTA) diagnosis RISs is essential ensure proper radiation characteristics. In this work, we propose a novel OTA method 1- bit RIS based on amplitude-only measurements. The proposed algorithm also experimentally validated with single-probe setup in an anechoic chamber, where all faulty elements can be correctly detected phaseless highly...
Ultra-massive multiple-input and multiple-output (MIMO) systems have been seen as the key radio technology for advancement of wireless communication systems, due to its capability better utilize spatial dimension propagation channels. Channel sounding is essential developing accurate realistic channel models massive MIMO systems. However, with large-scale antenna has faced significant challenges in practice. The real array based (RAA) sounder suffers from high complexity cost, while virtual...