Julian Cheng
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View article: Bioactive Peptides Derived from Tuna: Screening, Extraction, Bioactivity, and Mechanism of Action
Bioactive Peptides Derived from Tuna: Screening, Extraction, Bioactivity, and Mechanism of Action Open
Peptides play a crucial role in the development of pharmaceuticals and functional foods. Multiple studies have shown that natural bioactive peptides possess antioxidant, antihypertensive, anti-tumor, and anti-inflammatory activities. Marin…
View article: Channel characterization and analysis for indoor non-line-of-sight ultraviolet communications
Channel characterization and analysis for indoor non-line-of-sight ultraviolet communications Open
Current research on ultraviolet (UV) channel modeling has predominantly emphasized outdoor environments, whereas indoor scenarios remain comparatively underexplored. To address this research disparity, we conduct a systematic investigation…
View article: Doppler Lidar-Driven CFD Simulation for High-Density Urban Areas: Validation with Near-Ground Measurements in Singapore
Doppler Lidar-Driven CFD Simulation for High-Density Urban Areas: Validation with Near-Ground Measurements in Singapore Open
Assessing urban ventilation plays an increasingly important role in supporting urban planning/design, especially for high-density cities suffering from poor wind conditions and an intensive urban heat island effect. Many design and technic…
View article: Mitigation of inter-symbol interference in non-line-of-sight ultraviolet communication using a photon counting image sensor
Mitigation of inter-symbol interference in non-line-of-sight ultraviolet communication using a photon counting image sensor Open
Scattering-based ultraviolet (UV) transmission is a crucial method for realizing non-line-of-sight (NLOS) optical communications. However, the inherent multipath characteristics of scattering channels can induce inter-symbol interference (…
View article: BiLSTM-Attention-PFTBD: Robust Long-Baseline Acoustic Localization for Autonomous Underwater Vehicles in Adversarial Environments
BiLSTM-Attention-PFTBD: Robust Long-Baseline Acoustic Localization for Autonomous Underwater Vehicles in Adversarial Environments Open
The accurate and reliable localization and tracking of Autonomous Underwater Vehicles (AUVs) are essential for the success of various underwater missions, such as environmental monitoring, subsea resource exploration, and military operatio…
View article: Optimizing Smart Helper Placement for Enhanced Cache Efficiency in F-RANs
Optimizing Smart Helper Placement for Enhanced Cache Efficiency in F-RANs Open
Smart helpers (SHs) have been proposed to improve content delivery delays and alleviate high fronthaul loads in fog radio access networks (F-RANs). They offer an alternative to deploying additional enhanced remote radio heads (RRHs), which…
View article: Prediction of fragment impact energy release overpressure based on machine learning
Prediction of fragment impact energy release overpressure based on machine learning Open
The overpressure within a quasi-sealed chamber serves as a crucial metric for assessing the energy release behavior and impact potential of energetic fragments. Combining one-dimensional shock wave theory and material microparameters, diff…
View article: Path Loss Modeling for NLoS Ultraviolet Channels Incorporating Scattering and Reflection Effects
Path Loss Modeling for NLoS Ultraviolet Channels Incorporating Scattering and Reflection Effects Open
This paper tackles limitations in existing non-line-of-sight (NLoS) ultraviolet (UV) channel models, where conventional approaches assume obstacle-free propagation or uniform radiation intensity. In this paper, we develop a path loss model…
View article: Modeling of UV NLoS Communication Channels: From Atmospheric Scattering and Obstacle Reflection Perspectives
Modeling of UV NLoS Communication Channels: From Atmospheric Scattering and Obstacle Reflection Perspectives Open
As transceiver elevation angles increase from small to large, existing ultraviolet (UV) non-line-of-sight (NLoS) models encounter two challenges: i) cannot estimate the channel characteristics of UV NLoS communication scenarios when there …
View article: Channel Modeling for Ultraviolet Non-Line-of-Sight Communications Incorporating an Obstacle
Channel Modeling for Ultraviolet Non-Line-of-Sight Communications Incorporating an Obstacle Open
Existing studies on ultraviolet (UV) non-line-of-sight (NLoS) channel modeling primarily focus on scenarios without any obstacle, which makes them unsuitable for small transceiver elevation angles in most cases. To address this issue, a UV…
View article: Learned Trimmed-Ridge Regression for Channel Estimation in Millimeter-Wave Massive MIMO
Learned Trimmed-Ridge Regression for Channel Estimation in Millimeter-Wave Massive MIMO Open
Channel estimation poses significant challenges in millimeter-wave massive multiple-input multiple-output systems, especially when the base station has fewer radio-frequency chains than antennas. To address this challenge, one promising so…
View article: CubeSat-Enabled Free-Space Optics: Joint Data Communication and Fine Beam Tracking
CubeSat-Enabled Free-Space Optics: Joint Data Communication and Fine Beam Tracking Open
The integration of CubeSats with Free Space Optical (FSO) links accelerates a major advancement in high-throughput, low-Earth orbit communication systems. However, CubeSats face challenges such as size, weight, and power (SWaP) limitations…
View article: Hear You Say You: An Efficient Framework for Marine Mammal Sounds’ Classification
Hear You Say You: An Efficient Framework for Marine Mammal Sounds’ Classification Open
Marine mammals and their ecosystem face significant threats from, for example, military active sonar and marine transportation. To mitigate this harm, early detection and classification of marine mammals are essential. While recent efforts…
View article: Positioning Using Wireless Networks: Applications, Recent Progress and Future Challenges
Positioning Using Wireless Networks: Applications, Recent Progress and Future Challenges Open
Positioning has recently received considerable attention as a key enabler in emerging applications such as extended reality, unmanned aerial vehicles and smart environments. These applications require both data communication and high-preci…
View article: Non-line-of-sight ultraviolet transmission coverage in non-precipitating, foggy, and rainy weather
Non-line-of-sight ultraviolet transmission coverage in non-precipitating, foggy, and rainy weather Open
Sensitivity to weather conditions is the principal limitation of free-space optical communication. However, for the scattering based ultraviolet (UV) non-line-of-sight (NLOS) communication, the atmospheric scattering effect functions as an…
View article: Smart Helper-Aided F-RANs: Improving Delay and Reducing Fronthaul Load
Smart Helper-Aided F-RANs: Improving Delay and Reducing Fronthaul Load Open
In traditional Fog-Radio Access Networks (F-RANs), enhanced remote radio heads (eRRHs) are connected to a macro base station (MBS) through fronthaul links. Deploying a massive number of eRRHs is not always feasible due to site constraints …
View article: A Highly Efficient Marine Mammals Classifier Based on a Cross-Covariance Attended Compact Feed-Forward Sequential Memory Network (Student Abstract)
A Highly Efficient Marine Mammals Classifier Based on a Cross-Covariance Attended Compact Feed-Forward Sequential Memory Network (Student Abstract) Open
Military active sonar and marine transportation are detrimental to the livelihood of marine mammals and the ecosystem. Early detection and classification of marine mammals using machine learning can help humans to mitigate the harm to mari…
View article: Intelligent Reflecting Surface Assisted Multi-Cluster AirComp via Dynamic Beamforming
Intelligent Reflecting Surface Assisted Multi-Cluster AirComp via Dynamic Beamforming Open
This paper studies an multi-cluster over-the-air computation (AirComp) system, where an intelligent reflecting surface (IRS) assists the signal transmission from devices to an access point (AP). The clusters are activated to compute hetero…
View article: Secrecy-Capacity Bounds for Visible Light Communications With Signal-Dependent Noise
Secrecy-Capacity Bounds for Visible Light Communications With Signal-Dependent Noise Open
In physical-layer security, secrecy capacity is an important performance metric. This work aims to determine the secrecy capacity for an indoor visible light communication system consisting of a transmitter, a legitimate receiver and an ea…
View article: Performance of Wireless Powered Communication Systems Over Beaulieu-Xie Channels With Nonlinear Energy Harvesters
Performance of Wireless Powered Communication Systems Over Beaulieu-Xie Channels With Nonlinear Energy Harvesters Open
Performance of wireless powered wireless systems is analyzed. The wireless devices in such systems scavenge energy from sources in downlinks and use the energy to communicate in uplinks. We introduce two new models for these energy harvest…
View article: Joint Ultrasonic Index Modulation and Splitting Detection for Intra-Body Communications
Joint Ultrasonic Index Modulation and Splitting Detection for Intra-Body Communications Open
The reliability of ultrasonic intra-body communication (IBC) is crucial for medical monitoring, diagnosis, and treatment. Recently, ultrasonic splitting receivers that jointly use coherent detection (CD) and non-coherent energy detection (…
View article: Asynchronous Cell-Free Massive MIMO With Rate-Splitting
Asynchronous Cell-Free Massive MIMO With Rate-Splitting Open
In practical cell-free (CF) massive multiple-input multiple-output (MIMO) networks with distributed and low-cost access points, the asynchronous arrival of signals at the user equipments increases multi-user interference that degrades the …
View article: Physical-Layer Security for UAV-Assisted Air-to-Underwater Communication Systems with Fixed-Gain Amplify-and-Forward Relaying
Physical-Layer Security for UAV-Assisted Air-to-Underwater Communication Systems with Fixed-Gain Amplify-and-Forward Relaying Open
We analyze a secure unmanned aerial vehicle-assisted two-hop mixed radio frequency (RF) and underwater wireless optical communication (UWOC) system using a fixed-gain amplify-and-forward (AF) relay. The UWOC channel was modeled using a mix…
View article: Performance Analysis of Cell-Free Massive MIMO Systems with Asynchronous Reception
Performance Analysis of Cell-Free Massive MIMO Systems with Asynchronous Reception Open
Cell-free (CF) massive multiple-input multiple-output (MIMO) is considered as a promising technology for achieving the ultimate performance limit. However, due to its distributed architecture and low-cost access points (APs), the signals r…
View article: A Quantum Optimization Algorithm for Single Machine Total Weighted Tardiness Minimization
A Quantum Optimization Algorithm for Single Machine Total Weighted Tardiness Minimization Open
A single machine total weighted tardiness minimization (TWTM) problem in operational planning is considered. The problem is formulated as an NP-hard constrained combinatorial problem, which has no known deterministic polynomial complexity …
View article: Experimental demonstration of twin-single-sideband signal detection system based on a single photodetector and without optical bandpass filter
Experimental demonstration of twin-single-sideband signal detection system based on a single photodetector and without optical bandpass filter Open
A twin-single-sideband (twin-SSB) signal single-photodiode (PD) detection system without optical bandpass filter is experimentally demonstrated for the first time. After direct detection by a single-ended PD at the receiver side, we can di…
View article: Federated Deep Reinforcement Learning for RIS-Assisted Indoor Multi-Robot Communication Systems
Federated Deep Reinforcement Learning for RIS-Assisted Indoor Multi-Robot Communication Systems Open
Indoor multi-robot communications face two key challenges: one is the severe\nsignal strength degradation caused by blockages (e.g., walls) and the other is\nthe dynamic environment caused by robot mobility. To address these issues, we\nco…
View article: Ultrasonic Backscatter Communication for Implantable Medical Devices
Ultrasonic Backscatter Communication for Implantable Medical Devices Open
This paper proposes an ultrasonic backscatter communication (UsBC) system for passive implantable medical devices (IMDs) that can operate without batteries, enabling versatile revolutionary applications for future healthcare. The proposed …
View article: On the Ergodic Mutual Information of Keyhole MIMO Channels With Finite-Alphabet Inputs
On the Ergodic Mutual Information of Keyhole MIMO Channels With Finite-Alphabet Inputs Open
This letter studies the ergodic mutual information (EMI) of keyhole multiple-input multiple-output channels having finite-alphabet input signals. The EMI is first investigated for single-stream transmission considering both cases with and …
View article: Asymptotic Average Mutual Information Over Finite Input Mixture Gamma Distributed Channels
Asymptotic Average Mutual Information Over Finite Input Mixture Gamma Distributed Channels Open
This letter establishes a unified analytical framework to study the asymptotic average mutual information (AMI) of mixture gamma (MG) distributed fading channels driven by finite input signals in the high signal-to-noise ratio (SNR) regime…