Research Interest

  • Embedded Networked Systems
  • Wireless and Mobile Systems
  • Sensor Networks
  • Cyber-Physical Systems

Complex Engineered Systems Lab (Tsinghua)

Advised by Lin Zhang

RohmViz


With various sensors deployed in the structure of Rohm Building, we are exploring the possibility of extracting meaningful events and visually showing the end users.

  • Created 3D Model with support of interaction by Google SketchUp and Unity.
  • Adopted Node.js with Socket.IO as back-end server, and HTML5 for the front-end real-time display.

Microsoft Research Asia

Advised by Xiaofan Fred Jiang, in Mobile and Sensing Systems

LiveSynergy


LiveSynergy is a novel magnetic-based wireless proximity detection platform, with accuracy and consistency better than existing solutions such as BLE, WiFi, ZigBee, and long-range RFID. Building on top of this platform, we provide cloud-based APIs that enable real-time and rich interactions between humans and their physical environment. LiveSynergy enables a range of indoor applications such as location-based targeted advertising and presence detection.

Key technologies: MI, 6LoWPAN, SoC programming, JSON, RESTful, Windows Phone App

  • Embedded hardware system design and debugging; improved the system reliability and MCU transient immunity; manufactured 60+ boards for deployment.
  • Design and development of Windows Phone 7.5 native application to enable bi-directional interaction.
  • Conducted experiments to measure the reliability and consistency for zone proximity sensing of current technologies (BLE, RFID, ZigBee); post-processed the raw data and compared the results with our magnetic-based platform.
  • Presented several demos for UbiComp Open House Demo and MSR Technical Review Board.

SEPTIMU


SEPTIMU aims to design a novel hardware system to provide human with continuous in-situ human wellness monitoring and feedback using sensors embedded in earphones. We now have the embedded sensor board (1x1cm^2) and integrates 3-axis accelerometer, gyroscope, thermometer, and microphone. Our evaluation has demonstrated the effectiveness using the microphone to detect human's heartbeat while the IMU can assist posture recognition.

  • Designed the prototype with microphone and IMU, perfectly embedded in normal earphones.
  • A windows phone app and matlab code for the communication using audio jack.

PhoneWeb


The PhoneWeb project seeks to enable – through the use of new technologies such as Low-Energy Bluetooth, GPS, Low-Power Wi-Fi, Wi-Fi direct, and etc – handheld devices to continuously and accurately discover all the people around it and to create and maintain a local neighborhood map. We also seek to implement new types of local/social applications based on the PhoneWeb infrastructure.

  • Implemented a GUI frontend for PhoneWeb - SubwayRendezVous client
  • A brief video to promote this project within MSRA.
  • Bluetooth low energy technology characteristic testing.

Tsinghua National Laboratory for Information
Science and Technology

Advised by Prof. Kewu Peng

  • Analyzed the iterative corporation between the demapper and the decoder in BICM-ID system based on EXIT char tool.
  • Proposed a simplified criterion -- Hamming Euclidean Distance Spectra -- to evaluate the equivalence of labelings andobtain the classification of unique mappings;submitted a patent to suggest a constellation mapping and de-mapping scheme by applying this criterion on DVB-S2 coded modulation systems.
  • Conducted experiments for the evaluation of set-top box over different multi-path channels for building a model of Single Frequency Network.