603 citations · 811 across the 12 of their papers we have counts for
13 papers
Seirios: Leveraging Multiple Channels for LoRaWAN Indoor and Outdoor Localization
Jun Liu, Jiayao Gao, Sanjay Jha +1
Localization is important for a large number of Internet of Things (IoT) endpoint devices connected by LoRaWAN. Due to the bandwidth limitations of LoRaWAN, existing localization m…
Deep Learning for Radio-based Human Sensing: Recent Advances and Future Directions
Isura Nirmal, Abdelwahed Khamis, Mahbub Hassan +2
While decade-long research has clearly demonstrated the vast potential of radio frequency (RF) for many human sensing tasks, scaling this technology to large scenarios remained pro…
Simultaneous Energy Harvesting and Gait Recognition using Piezoelectric Energy Harvester
Dong Ma, Guohao Lan, Weitao Xu +2
Piezoelectric energy harvester, which generates electricity from stress or vibrations, is gaining increasing attention as a viable solution to extend battery life in wearables. Rec…
Nephalai: Towards LPWAN C-RAN with Physical Layer Compression
Jun Liu, Weitao Xu, Sanjay Jha +1
We propose Nephalai, a Compressive Sensing-based Cloud Radio Access Network (C-RAN), to reduce the uplink bit rate of the physical layer (PHY) between the gateways and the cloud se…
A Novel Emergency Light Based Smart Building Solution: Design, Implementation and Use Cases
Weitao Xu, Jin Zhang, Jun Young Kim +5
Deployment of Internet of Things (IoT) in smart buildings has received considerable interest from both the academic community and commercial sectors. Unfortunately, widespread adop…
A Survey of COVID-19 Contact Tracing Apps
Nadeem Ahmed, Regio A. Michelin, Wanli Xue +7
The recent outbreak of COVID-19 has taken the world by surprise, forcing lockdowns and straining public health care systems. COVID-19 is known to be a highly infectious virus, and…
Skin-MIMO: Vibration-based MIMO Communication over Human Skin
Dong Ma, Yuezhong Wu, Ming Ding +2
We explore the feasibility of Multiple-Input-Multiple-Output (MIMO) communication through vibrations over human skin. Using off-the-shelf motors and piezo transducers as vibration…
Measurement, Characterization and Modeling of LoRa Technology in Multi-floor Buildings
Weitao Xu, Jun Young Kim, Walter Huang +3
In recent years, we have witnessed the rapid development of LoRa technology, together with extensive studies trying to understand its performance in various application settings. I…
H2B: Heartbeat-based Secret Key Generation Using Piezo Vibration Sensors
Qi Lin, Weitao Xu, Jun Liu +4
We present Heartbeats-2-Bits (H2B), which is a system for securely pairing wearable devices by generating a shared secret key from the skin vibrations caused by heartbeat. This wor…
SolarGest: Ubiquitous and Battery-free Gesture Recognition using Solar Cells
Dong Ma, Guohao Lan, Mahbub Hassan +4
We design a system, SolarGest, which can recognize hand gestures near a solar-powered device by analyzing the patterns of the photocurrent. SolarGest is based on the observation th…
EnTrans:Leveraging Kinetic Energy Harvesting Signal for Transportation Mode Detection
Guohao Lan, Weitao Xu, Dong Ma +3
Monitoring the daily transportation modes of an individual provides useful information in many application domains, such as urban design, real-time journey recommendation, as well…
Capacitor Based Activity Sensing for Kinetic Powered Wearable IoTs
Guohao Lan, Dong Ma, Weitao Xu +2
We propose a novel use of the conventional energy storage component, i.e., capacitor, in kinetic-powered wearable IoTs as a sensor to detect human activities. Since different activ…
Sparsity based Efficient Cross-Correlation Techniques in Sensor Networks
Prasant Misra, Wen Hu, Mingrui Yang +2
Cross-correlation is a popular signal processing technique used in numerous location tracking systems for obtaining reliable range information. However, its efficient design and pr…