Publications (100)
Localization in Power-Constrained Terahertz-Operating Software-Defined Metamaterials
Filip Lemic, Sergi Abadal, Chong Han +3
Software-Defined Metamaterials (SDMs) show a strong potential for advancing the engineered control of electromagnetic waves. As such, they are envisioned to enable a variety of exc…
Deep Reinforcement Learning Based Cross-Layer Design in Terahertz Mesh Backhaul Networks
Zhifeng Hu, Chong Han, Xudong Wang
Supporting ultra-high data rates and flexible reconfigurability, Terahertz (THz) mesh networks are attractive for next-generation wireless backhaul systems that empower the integra…
Graph Neural Network Aided Deep Reinforcement Learning for Resource Allocation in Dynamic Terahertz UAV Networks
Zhifeng Hu, Chong Han
Terahertz (THz) unmanned aerial vehicle (UAV) networks with flexible topologies and ultra-high data rates are expected to empower numerous applications in security surveillance, di…
A Unified 3D Beam Training and Tracking Procedure for Terahertz Communication
Boyu Ning, Zhi Chen, Zhongbao Tian +2
Terahertz (THz) communication is considered as an attractive way to overcome the bandwidth bottleneck and satisfy the ever-increasing capacity demand in the future. Due to the high…
Centimeter-level Geometry Reconstruction and Material Identification in 300 GHz Monostatic Sensing
Zitong Fang, Ziming Yu, Chong Han
Terahertz (THz) integrated sensing and communication (ISAC) technology is envisioned to achieve high communication performance alongside advanced sensing abilities. For various app…
THz ISAC: A Physical-Layer Perspective of Terahertz Integrated Sensing and Communication
Chong Han, Yongzhi Wu, Zhi Chen +2
The Terahertz (0.1-10 THz) band holds enormous potential for supporting unprecedented data rates and millimeter-level accurate sensing thanks to its ultra-broad bandwidth. Terahert…
Channel Measurement, Characterization and Modeling for Terahertz Indoor Communications Above 200 GHz
Yi Chen, Chong Han, Ziming Yu +1
Terahertz (THz) communications are envisioned as a promising technology for sixth-generation (6G) and beyond systems, owing to its unprecedented multi-gigahertz (GHz) bandwidth. In…
Multi-Connectivity for Indoor Terahertz Communication with Self and Dynamic Blockage
Akram Shafie, Nan Yang, Chong Han
We derive new expressions for the connection probability and the average ergodic capacity to evaluate the performance achieved by multi-connectivity (MC) in an indoor ultra-wideban…
Dual-Functional FMCW Waveform for Terahertz Space Debris Detection and Inter-Satellite Communications
Zhepu Yin, Weijun Gao, Chong Han
Terahertz (THz) band communication, ranging from 0.1 THz to 10 THz, is envisioned as a key enabling technology for next-generation networks and future applications such as inter-sa…
Beamforming Technologies for Ultra-Massive MIMO in Terahertz Communications
Boyu Ning, Zhongbao Tian, Weidong Mei +5
Terahertz (THz) communications with a frequency band THz are envisioned as a promising solution to future high-speed wireless communication. Although with tens of gigahert…
Hybrid Spherical- and Planar-Wave Channel Modeling and Estimation for Terahertz Integrated UM-MIMO and IRS Systems
Yuhang Chen, Renwang Li, Chong Han +2
Integrated ultra-massive multiple-input multiple-output (UM-MIMO) and intelligent reflecting surface (IRS) systems are promising for 6G and beyond Terahertz (0.1-10 THz) communicat…
Physics-Informed Spatial-Temporal Transformer for Terahertz Near-Field Beam Tracking
Zhi Zeng, Chong Han, Emil Björnson
Terahertz (THz) ultra-massive multiple-input multiple-output (UM-MIMO) promises ultra-high throughput, while its highly directional beams demand rapid and accurate beam tracking dr…
Environment-Aware Channel Measurement and Modeling for Terahertz Monostatic Sensing
Yejian Lyu, Zhiqiang Yuan, Henk Wymeersch +1
Integrated sensing and communication (ISAC) at terahertz (THz) frequencies holds significant promise for unifying ultra-high-speed wireless connectivity with fine-grained environme…
Hybrid Channel Modeling and Environment Reconstruction for Terahertz Monostatic Sensing
Yejian Lyu, Zeyu Huang, Stefan Schwarz +1
THz ISAC aims to integrate novel functionalities, such as positioning and environmental sensing, into communication systems. Accurate channel modeling is crucial for the design and…
Transfer Learning Enabled Transformer based Generative Adversarial Networks (TT-GAN) for Terahertz Channel Modeling and Generating
Zhengdong Hu, Yuanbo Li, Chong Han
Terahertz (THz) communications, ranging from 100 GHz to 10 THz, are envisioned as a promising technology for 6G and beyond wireless systems. As foundation of designing THz communic…
Learning-based Prediction, Rendering and Transmission for Interactive Virtual Reality in RIS-Assisted Terahertz Networks
Xiaonan Liu, Yansha Deng, Chong Han +1
The quality of experience (QoE) requirements of wireless Virtual Reality (VR) can only be satisfied with high data rate, high reliability, and low VR interaction latency. This high…
Frequency-Position-Fluid Antenna Array for Ultra-dense Connectivity in Terahertz Beamforming Systems
Heyin Shen, Chong Han, Hao Liu +1
The position-fluid antenna (PFA) architecture has become one of the appealing technologies to support ubiquitous connectivity demand in next-generation wireless systems. Specifical…
When AI Meets Terahertz: A Survey on the Symbiosis of Artificial Intelligence and Terahertz Networks
Chong Han, Jingting Jiang, Zhengdong Hu +2
The Terahertz (THz) band (0.1-10 THz) has emerged as a critical frontier for future communication systems, offering ultra-wide bandwidths that enable Terabits-per-second (Tbps) wir…
Tera-SpaceCom: GNN-based Deep Reinforcement Learning for Joint Resource Allocation and Task Offloading in TeraHertz Band Space Networks
Zhifeng Hu, Chong Han, Wolfgang Gerstacker +1
Terahertz (THz) space communications (Tera-SpaceCom) is envisioned as a promising technology to enable various space science and communication applications. Mainly, the realm of Te…
Spectrum Allocation with Adaptive Sub-band Bandwidth for Terahertz Communication Systems
Akram Shafie, Nan Yang, Sheeraz Alvi +3
We study spectrum allocation for terahertz (THz) band communication (THzCom) systems, while considering the frequency and distance-dependent nature of THz channels. Different from…
Combating the Distance Problem in the Millimeter Wave and Terahertz Frequency Bands
Ian F. Akyildiz, Chong Han, Shuai Nie
In the millimeter wave (30-300 GHz) and Terahertz (0.1-10 THz) frequency bands, high spreading loss and molecular absorption often limit the signal transmission distance and covera…
PAFedFV: Personalized and Asynchronous Federated Learning for Finger Vein Recognition
Hengyu Mu, Jian Guo, Chong Han +1
With the increasing emphasis on user privacy protection, biometric recognition based on federated learning have become the latest research hotspot. However, traditional federated l…
Hybrid Spherical- and Planar-Wave Channel Modeling and DCNN-powered Estimation for Terahertz Ultra-massive MIMO Systems
Yuhang Chen, Longfei Yan, Chong Han
The Terahertz band is envisioned to meet the demanding 100 Gbps data rates for 6G wireless communications. Aiming at combating the distance limitation problem with low hardware-cos…
A Geography-Inspired and Self-Adaptive Clustering Algorithm: A Study in Channel Measurement
Yiqin Wang, Chong Han
The phenomenon that multi-path components (MPCs) arrive in clusters has been verified by channel measurements, and is widely adopted by cluster-based channel models. As a crucial i…
Frequency-Position-Fluid Antenna Array and Beamforming for Ultra-dense Connectivity in Terahertz Wireless Systems
Heyin Shen, Chong Han, Jinhong Yuan
To support ultra-dense connectivity in terahertz (THz) communications, this paper proposes a dynamic frequency-position-fluid antenna (D-FPFA) architecture. Frequency-tunable local…
DTECM: Digital Twin Enabled Channel Measurement and Modeling in Terahertz Urban Macrocell
Yuanbo Li, Ziming Yu, Chong Han
In this work, in the THz UMa, extensive channel measurements are conducted and an accurate channel model is developed by combining ray-tracing, computer vision (CV), and statistica…
Beam Manipulation for Terahertz Communications: A New Quality Productive Force
Mingxiang Li, Josep M. Jornet, Daniel M. Mittleman +1
The terahertz frequency band, ranging from 0.1 to 10 THz, offers extensive spectral resources for next-generation wireless communication systems. To compensate for the limited tran…
Empirical Study on Near-Field and Spatial Non-Stationarity Modeling for THz XL-MIMO Channel in Indoor Scenario
Huixin Xu, Jianhua Zhang, Pan Tang +5
Terahertz (THz) extremely large-scale MIMO (XL-MIMO) is considered a key enabling technology for 6G and beyond due to its advantages such as wide bandwidth and high beam gain. As t…
DiffPace: Diffusion-based Plug-and-play Augmented Channel Estimation in mmWave and Terahertz Ultra-Massive MIMO Systems
Zhengdong Hu, Chong Han, Wolfgang Gerstacker +1
Millimeter-wave (mmWave) and Terahertz (THz)-band communications hold great promise in meeting the growing data-rate demands of next-generation wireless networks, offering abundant…
Cross Far- and Near-Field Channel Measurement and Modeling in Extremely Large-scale Antenna Array (ELAA) Systems
Yiqin Wang, Chong Han, Shu Sun +1
Technologies like ultra-massive multiple-input-multiple-output (UM-MIMO) and reconfigurable intelligent surfaces (RISs) are of special interest to meet the key performance indicato…
Electromagnetic Nanonetworks Beyond 6G: From Wearable and Implantable Networks to On-chip and Quantum Communication
Sergi Abadal, Chong Han, Vitaly Petrov +3
Emerging from the symbiotic combination of nanotechnology and communications, the field of nanonetworking has come a long way since its inception more than fifteen years ago. Signi…
Terahertz Channel Measurement and Analysis on a University Campus Street
Yiqin Wang, Yuanbo Li, Yi Chen +2
Owning abundant bandwidth resource, the Terahertz (0.1-10 THz) band is a promising spectrum to support sixth-generation (6G) and beyond communications. As the foundation of channel…
PRINCE: A Pruned AMP Integrated Deep CNN Method for Efficient Channel Estimation of Millimeter-wave and Terahertz Ultra-Massive MIMO Systems
Zhengdong Hu, Yuhang Chen, Chong Han
Millimeter-wave (mmWave) and Terahertz (THz)-band communications exploit the abundant bandwidth to fulfill the increasing data rate demands of 6G wireless communications. To compen…
Ergodic Achievable Rate Analysis and Optimization of RIS-assisted Millimeter-Wave MIMO Communication Systems
Renwang Li, Shu Sun, Yuhang Chen +2
Reconfigurable intelligent surfaces (RISs) have emerged as a prospective technology for next-generation wireless networks due to their potential in coverage and capacity enhancemen…
Transfer Generative Adversarial Networks (T-GAN)-based Terahertz Channel Modeling
Zhengdong Hu, Yuanbo Li, Chong Han
Terahertz (THz) communications are envisioned as a promising technology for 6G and beyond wireless systems, providing ultra-broad bandwidth and thus Terabit-per-second (Tbps) data…
On Multiple-Antenna Techniques for Physical-Layer Range Security in the Terahertz Band
Weijun Gao, Xuyang Lu, Chong Han +1
Terahertz (THz) communications have naturally promising physical layer security (PLS) performance in the angular domain due to the high directivity feature brought by the ultra-mas…
Joint Inter-path and Intra-path Multiplexing for Terahertz Widely-spaced Multi-subarray Hybrid Beamforming Systems
Longfei Yan, Yuhang Chen, Chong Han +1
Terahertz (THz) communications with multi-GHz bandwidth are envisioned as a key technology for 6G systems. Ultra-massive (UM) MIMO with hybrid beamforming architectures are widely…
Hybrid Beamforming with Widely-spaced-array for Multi-user Cross-Near-and-Far-Field Communications
Heyin Shen, Yuhang Chen, Chong Han +1
With multi-GHz bandwidth, Terahertz (THz) beamforming has drawn increasing attention in the sixth generation (6G) and beyond communications. Existing beamforming designs mainly foc…
Topology-Aware Two-Stage Federated Learning via Proxy Models for Sub-THz Heterogeneous LEO Communications
Jinhao Yi, Weijun Gao, Chong Han +2
Federated learning (FL) has emerged as a promising distributed training paradigm for Low Earth Orbit (LEO) networks by significantly reducing communication overhead. However, its d…
Movable Antennas: Channel Measurement, Modeling, and Performance Evaluation
Yiqin Wang, Heyin Shen, Chong Han +1
Since decades ago, multi-antenna has become a key enabling technology in the evolution of wireless communication systems. In contrast to conventional multi-antenna systems that con…
Finger Multimodal Feature Fusion and Recognition Based on Channel Spatial Attention
Jian Guo, Jiaxiang Tu, Hengyi Ren +2
Due to the instability and limitations of unimodal biometric systems, multimodal systems have attracted more and more attention from researchers. However, how to exploit the indepe…
Hybrid Beamforming for Terahertz Wireless Communications: Challenges, Architectures, and Open Problems
Chong Han, Longfei Yan, Jinhong Yuan
Terahertz (THz) communications are regarded as a pillar technology for the sixth generation (6G) wireless systems, by offering multi-ten-GHz bandwidth. To overcome the short transm…
Airy Beam Engineering in Near-field Communications: A Tractable Closed-Form Analysis in the Terahertz Band
Wenqi Zhao, Chong Han, Emil Björnson
Terahertz (THz) communication can offer terabit-per-second rates in future wireless systems, thanks to the ultra-wide bandwidths, but require large antenna arrays. As antenna apert…
Correlation-based Dual-band THz Channel Measurements and Characterization in a Laboratory
Yuanbo Li, Yiqin Wang, Yi Chen +2
The Terahertz band, spanning from 0.1~THz to 10~THz, is envisioned as a key technology to realize ultra-high data rates in the 6G and beyond mobile communication systems, due to it…
Intelligent Reflecting Surface Assisted Terahertz Communications toward 6G
Zhi Chen, Boyu Ning, Chong Han +2
Terahertz (THz) communications have emerged as a promising candidate to support the heavy data traffic and exploding network capacity in the future 6G wireless networks. However, T…
Time-Frequency-Space Transmit Design and Receiver Processing with Dynamic Subarray for Terahertz Integrated Sensing and Communication
Yongzhi Wu, Chong Han, Meixia Tao
Terahertz (THz) integrated sensing and communication (ISAC) enables simultaneous data transmission with Terabit-per-second (Tbps) rate and millimeter-level accurate sensing. To rea…
Environment Reconstruction in Terahertz Monostatic Sensing: Joint Millimeter-level Geometry Mapping and Material Identification
Zitong Fang, Yejian Lyu, Ziming Yu +1
Terahertz (THz) integrated sensing and communication (ISAC) offers high-speed communication alongside precise environmental sensing. This paper presents a computationally efficient…
Sensing Integrated DFT-Spread OFDM Waveform and Deep Learning-powered Receiver Design for Terahertz Integrated Sensing and Communication Systems
Yongzhi Wu, Filip Lemic, Chong Han +1
Terahertz (THz) communications are envisioned as a key technology of next-generation wireless systems due to its ultra-broad bandwidth. One step forward, THz integrated sensing and…
Terahertz Wireless Data Center: Gaussian Beam or Airy Beam?
Wenqi Zhao, Sergi Abadal, Guochao Song +2
Terahertz (THz) communication is emerging as a pivotal enabler for 6G and beyond wireless systems owing to its multi-GHz bandwidth. One of its novel applications is in wireless dat…
220 GHz Urban Microcell Channel Measurement and Characterization on a University Campus
Yuanbo Li, Yiqin Wang, Yejian Lyu +2
Owning abundant bandwidth resources, the Terahertz (THz) band (0.1-10~THz) is envisioned as a key technology to realize ultra-high-speed communications in 6G and beyond wireless ne…
Channel Measurement and Coverage Analysis for NIRS-Aided THz Communications in Indoor Environments
Yuanbo Li, Yiqin Wang, Yi Chen +2
Due to large reflection and diffraction losses in the THz band, it is arguable to achieve reliable links in the none-line-of-sight (NLoS) cases. Intelligent reflecting surfaces, al…
Terahertz Communications (TeraCom): Challenges and Impact on 6G Wireless Systems
Chong Han, Yongzhi Wu, Zhi Chen +1
Terahertz communications are envisioned as a key technology for 6G, which requires 100+ Gbps data rates, 1-millisecond latency, among other performance metrics. As a fundamental wi…
DFT-Spread Orthogonal Time Frequency Space System with Superimposed Pilots for Terahertz Integrated Sensing and Communication
Yongzhi Wu, Chong Han, Zhi Chen
Terahertz (THz) integrated sensing and communication (ISAC) is a promising interdisciplinary technology that realizes simultaneously transmitting Terabit-per-second (Tbps) and mill…
When Wires Can't Keep Up: Reconfigurable AI Data Centers Empowered by Terahertz Wireless Communications
Chong Han, Mingjie Zhu, Wenqi Zhao +5
The explosive growth of artificial intelligence (AI) workloads in modern data centers demands a radical transformation of interconnect architectures. Traditional copper and optical…
Terahertz Communications for 6G and Beyond Wireless Networks: Challenges, Key Advancements, and Opportunities
Akram Shafie, Nan Yang, Chong Han +3
The unprecedented increase in wireless data traffic, predicted to occur within the next decade, is motivating academia and industries to look beyond contemporary wireless standards…
Can Far-field Beam Training Be Deployed for Cross-field Beam Alignment in Terahertz UM-MIMO Communications?
Yuhang Chen, Chong Han, Emil Björnson
Ultra-massive multiple-input multiple-output (UM-MIMO) is the enabler of Terahertz (THz) communications in next-generation wireless networks. In THz UM-MIMO systems, a new paradigm…
Can Multimodal Large Language Models Understand Pathologic Movements? A Pilot Study on Seizure Semiology
Lina Zhang, Tonmoy Monsoor, Mehmet Efe Lorasdagi +8
Multimodal Large Language Models (MLLMs) have demonstrated robust capabilities in recognizing everyday human activities, yet their potential for analyzing clinically significant in…
Dynamic-subarray with Fixed Phase Shifters for Energy-efficient Terahertz Hybrid Beamforming under Partial CSI
Longfei Yan, Chong Han, Nan Yang +1
Terahertz (THz) communications are regarded as a pillar technology for the 6G systems, by offering multi-ten-GHz bandwidth. To overcome the huge propagation loss while reducing the…
Energy-Efficient Target-Aware Hybrid Beamforming for THz Near-Field ISAC with Sparse Connectivity
Nusaibah A. Alshorman, Chong Han, Huseyin Arslan
Integrated sensing and communication (ISAC) at terahertz (THz) frequencies enables ultra-high-resolution perception while facing a key limitation: highly directional THz beams cann…
Hybrid Beamforming with Orthogonal delay-Doppler Division Multiplexing Modulation for Terahertz Sensing and Communication
Meilin Li, Chong Han, Shi Jin
The Terahertz band holds a promise to enable both super-accurate sensing and ultra-fast communication. However, challenges arise that severe Doppler effects call for a waveform wit…
Far- and Near-Field Channel Measurements and Characterization in the Terahertz Band Using a Virtual Antenna Array
Yiqin Wang, Shu Sun, Chong Han
Extremely large-scale antenna array (ELAA) technologies consisting of ultra-massive multiple-input-multiple-output (UM-MIMO) or reconfigurable intelligent surfaces (RISs), are emer…
Joint Hardware Design and Capacity Analysis for Intelligent Reflecting Surface Enabled Terahertz MIMO Communications
Xinying Ma, Zhi Chen, Longfei Yan +2
Terahertz (THz) communications have been envisioned as a promising enabler to provide ultra-high data transmission for sixth generation (6G) wireless networks. To tackle the blocka…
Half Spatially Coupled Turbo-Like Codes
Xiaowei Wu, Lei Yang, Min Qiu +2
This paper presents a new class of spatially coupled turbo-like codes (SC-TCs), namely half spatially coupled braided convolutional codes (HSC-BCCs) and half spatially coupled para…
A Measurement-Calibrated AI-Assisted Digital Twin for Terahertz Wireless Data Centers
Mingjie Zhu, Yejian Lyu, Ziming Yu +1
Terahertz (THz) wireless communication has emerged as a promising solution for future data center interconnects; however, accurate channel characterization and system-level perform…
Diffusion-Driven Terahertz Air-Ground Communications under Dynamic Atmospheric Turbulence
Jinhao Yi, Weijun Gao, Chong Han
The ever-increasing demand for ultra-high data rates in space-air-ground integrated networks (SAGINs) has rendered terahertz THz communications a promising technology owing to its…
300 GHz Wideband Channel Measurement and Analysis in a Lobby
Yiqin Wang, Yuanbo Li, Yi Chen +2
The Terahertz (0.1-10 THz) band has been envisioned as one of the promising spectrum bands to support ultra-broadband sixth-generation (6G) and beyond communications. In this paper…
How to Differentiate between Near Field and Far Field: Revisiting the Rayleigh Distance
Shu Sun, Renwang Li, Chong Han +3
Future wireless systems are likely to adopt extremely large aperture arrays to achieve higher throughput, wider coverage, and higher spatial resolution. Conventional wireless syste…
Enabling Large-Scale Channel Sounding for 6G: A Framework for Sparse Sampling and Multipath Component Extraction
Yi Chen, Ming Li, Chong Han
Realizing the 6G vision of artificial intelligence (AI) and integrated sensing and communication (ISAC) critically requires large-scale real-world channel datasets for channel mode…
Channel Measurement and Path-Loss Characterization for Low-Terahertz Indoor Scenarios
Jia He, Yi Chen, Yiqin Wang +2
TeraHertz (THz) communications are envisioned as a promising technology, owing to its unprecedented multi-GHz bandwidth. In this paper, wideband channel measurement campaigns at 14…
Terahertz Wireless Channels: A Holistic Survey on Measurement, Modeling, and Analysis
Chong Han, Yiqin Wang, Yuanbo Li +4
Terahertz (0.1-10 THz) communications are envisioned as a key technology for sixth generation (6G) wireless systems. The study of underlying THz wireless propagation channels provi…
Still Waters Run Deep: Extend THz Coverage with Non-Intelligent Reflecting Surface
Chong Han, Yuanbo Li, Yinqin Wang
Large reflection and diffraction losses in the Terahertz (THz) band give rise to degraded coverage abilities in non-line-of-sight (NLoS) areas. To overcome this, a non-intelligent…
Joint Communication and Radar Sensing for Terahertz Space-Air-Ground Integrated Networks (SAGIN)
Chong Han, Weijun Gao, Zhepu Yin +3
The transition from isolated systems to integrated solutions has driven the development of space-air-ground integrated networks (SAGIN) as well as the integration of communication…
Cross Far- and Near-Field Beam Management Technologies in Millimeter-Wave and Terahertz MIMO Systems
Yuhang Chen, Heyin Shen, Chong Han
The evolution of wireless communication toward next-generation networks introduces unprecedented demands on data rates, latency, and connectivity. To meet these requirements, two k…
Transformer-based GAN for Terahertz Spatial-Temporal Channel Modeling and Generating
Zhengdong Hu, Yuanbo Li, Chong Han
Terahertz (THz) communications are envisioned as a promising technology for 6G and beyond wireless systems, providing ultra-broad continuous bandwidth and thus Terabit-per-second (…
Novel Spectrum Allocation Among Multiple Transmission Windows for Terahertz Communication Systems
Akram Shafie, Nan Yang, Chong Han +1
This paper presents a novel spectrum allocation strategy for multiuser terahertz (THz) band communication systems when the to-be-allocated spectrum is composed of multiple transmis…
Coverage Analysis for 3D Terahertz Communication Systems
Akram Shafie, Nan Yang, Salman Durrani +3
We conduct novel coverage probability analysis of downlink transmission in a three-dimensional (3D) terahertz (THz) communication (THzCom) system. In this system, we address the un…
Energy-efficient Dynamic-subarray with Fixed True-time-delay Design for Terahertz Wideband Hybrid Beamforming
Longfei Yan, Chong Han, Jinhong Yuan
Hybrid beamforming for Terahertz (THz) ultra-massive multiple-input multiple-output (UM-MIMO) systems is a promising technology for 6G space-air-ground integrated networks, which c…
Attenuation and Loss of Spatial Coherence Modeling for Atmospheric Turbulence in Terahertz UAV MIMO Channels
Weijun Gao, Chong Han, Zhi Chen
Terahertz (THz) wireless communications have the potential to realize ultra-high-speed and secure data transfer with miniaturized devices for unmanned aerial vehicle (UAV) communic…
A Framework of Mahalanobis-Distance Metric with Supervised Learning for Clustering Multipath Components in MIMO Channel Analysis
Yi Chen, Chong Han, Jia He +1
As multipath components (MPCs) are experimentally observed to appear in clusters, cluster-based channel models have been focused in the wireless channel study. However, most of the…
TeraHertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade
Ian F. Akyildiz, Chong Han, Zhifeng Hu +2
Terahertz (THz) band communications are envisioned as a key technology for 6G and Beyond. As a fundamental wireless infrastructure, THz communication can boost abundant promising a…
Cross Far- and Near-field Wireless Communications in Terahertz Ultra-large Antenna Array Systems
Chong Han, Yuhang Chen, Longfei Yan +2
Terahertz (THz) band owning the abundant multi-ten-GHz bandwidth is capable to support Terabit-per-second wireless communications, which is a pillar technology for 6G and beyond sy…
300 GHz Dual-Band Channel Measurement, Analysis and Modeling in an L-shaped Hallway
Yiqin Wang, Yuanbo Li, Chong Han +2
The Terahertz (THz) band (0.1-10 THz) has been envisioned as one of the promising spectrum bands for sixth-generation (6G) and beyond communications. In this paper, a dual-band ang…
Efficient Airy Beam Training for Quasi-LoS Terahertz Near-Field Communications
Wenqi Zhao, Chong Han
With the enlargement of antenna apertures in 6G Terahertz (THz) communications, the Rayleigh distance expands significantly, rendering near-field propagation a dominant scenario in…
Scintillation and Attenuation Modelling of Atmospheric Turbulence for Terahertz UAV Channels
Weijun Gao, Chong Han, Zhi Chen
Terahertz (THz) wireless communications have the potential to realize ultra-high-speed and secure data transfer with miniaturized devices for unmanned aerial vehicle (UAV) communic…
Channel Measurement and Ray-Tracing-Statistical Hybrid Modeling for Low-Terahertz Indoor Communications
Yi Chen, Yuanbo Li, Chong Han +2
TeraHertz (THz) communications are envisioned as a promising technology, owing to its unprecedented multi-GHz bandwidth. One fundamental challenge when moving to new spectrum is to…
Generative AI-Empowered Semantic Twin Channel Model for ISAC
Yi Chen, Yatao Hu, Ming Li +1
Integrated sensing and communication (ISAC) increasingly exposes a gap in today's channel modeling. Efficient statistical models focus on coarse communication-centric metrics, and…
Hybrid Beamforming for Terahertz Multi-Carrier Systems over Frequency Selective Fading
Hang Yuan, Nan Yang, Kai Yang +2
We propose novel hybrid beamforming schemes for the terahertz (THz) wireless system where a multi-antenna base station (BS) communicates with a multi-antenna user over frequency se…
DNN based Two-stage Compensation Algorithm for THz Hybrid Beamforming with imperfect Hardware
Wenqi Zhao, Chong Han, Ho-Jin Song +1
Terahertz (THz) communication is envisioned as a key technology for 6G and beyond wireless systems owing to its multi-GHz bandwidth. To maintain the same aperture area and the same…
DSS-o-SAGE: Direction-Scan Sounding-Oriented SAGE Algorithm for Channel Parameter Estimation in mmWave and THz Bands
Yuanbo Li, Chong Han, Yi Chen +2
Investigation of millimeter (mmWave) and Terahertz (THz) channels relies on channel measurements and estimation of multi-path component (MPC) parameters. As a common measurement te…
Spectrum Sensing in Cooperative Cognitive Radio Networks with Partial CSI
Chong Han, Ido Nevat, Jinhong Yuan
We develop an efficient algorithm for cooperative spectrum sensing in a relay based cognitive radio network. We consider a stochastic model where data is sent from the Base Station…
Terahertz Aerospace Communications: Enabling Technologies and Future Directions
Weijun Gao, Chong Han, Zhi Chen +3
To achieve ubiquitous connectivity in next-generation networks through aerospace communications while maintaining high data rates, Terahertz (THz) band communications (0.1-10 THz)…
Modeling and Analysis of Terahertz Wave Propagation in Charged Dust Using Extended Mie Scattering Theory
Weijun Gao, Chong Han
Terahertz (THz) band (0.1-10 THz) possesses multi-gigahertz continuous bandwidth resources, making it a promising frequency band for high-speed wireless communications and environm…
CDiT: Conditional Diffusion Transformer for Geometry-Aware Terahertz Cross Far- and Near-Field Channel Generation
Zhengdong Hu, Chong Han
Accurate channel modeling is fundamental to design and evaluation of Terahertz (THz) ultra-massive multiple-input multiple-output (UM-MIMO) systems. However, existing model-based a…
Digital Twin Empowered In-Vehicular Channel Modeling and Wireless Planning in the Terahertz Band
Mingjie Zhu, Yejian Lyu, Chong Han
Vehicle-to-everything (V2X) technology has emerged as a key enabler of intelligent transportation systems, while the Terahertz (THz) band offers abundant spectrum resources to supp…
A Universal Attenuation Model of Terahertz Wave in Space-Air-Ground Channel Medium
Zhirong Yang, Weijun Gao, Chong Han
Providing continuous bandwidth over several tens of GHz, the Terahertz (THz) band (0.1-10 THz) supports space-air-ground integrated network (SAGIN) in 6G and beyond wireless networ…
Waveform Design for Joint Sensing and Communications in Millimeter-Wave and Low Terahertz Bands
Tianqi Mao, Jiaxuan Chen, Qi Wang +3
The convergence of sensing and communication in the millimeter-wave (mmWave) and low terahertz (THz) bands has been envisioned as a promising technology, since it incorporates high…
300 GHz Channel Measurement and Characterization in the Atrium of a Building
Yuanbo Li, Yiqin Wang, Yi Chen +2
With abundant bandwidth resource, the Terahertz band (0.1~THz to 10~THz) is envisioned as a key technology to realize ultra-high data rates in the 6G and beyond mobile communicatio…
Molecular Absorption Effect: A Double-edged Sword of Terahertz Communications
Chong Han, Weijun Gao, Nan Yang +1
Communications in the terahertz band (THz) (0.1--10~THz) have been regarded as a promising technology for future 6G and beyond wireless systems, to overcome the challenges of everg…
Artificial-Intelligence-Assisted Multi-Modal Terahertz Sensing and Environment Reconstruction
Yejian Lyu, Zitong Fang, Zhiqiang Yuan +2
Multi-modal sensing is an important enabler for future environment-aware wireless systems, since a single sensing modality is generally insufficient to provide accurate metric geom…
Seizure-Semiology-Suite (S3): A Clinically Multimodal Dataset, Benchmark, and Models for Seizure Semiology Understanding
Lina Zhang, Tonmoy Monsoor, Peizheng Li +23
While Multimodal Large Language Models (MLLMs) have demonstrated remarkable proficiency in general video understanding, their capacity to interpret involuntary, and spatio-temporal…