Ph.D. Student
Room 1119, Software Building No.1
Department of Computer Science and Engineering
Shanghai Jiao Tong University
No.800 Dongchuan Road, Minhang District
Shanghai, China
zhunzh"AT"shanghaitech.edu.cn

Low-power Backscatter Tag

Providing ubiquitous connectivity, backscatter systems have attracted a significant amount of research. Existing solutions for low-power 802.15.4 demodulator either choose to demodulate at the packet level, or offload the local oscillator to another device. We propose a new type of low-power demodulator that, for the first time, demodulates the downlink of commodity 802.15.4 devices at the symbol level without the help of external devices.

Device-Free Gesture Tracking

At present, speech recognition is the major interaction way of smart speakers. However, convenient gesture interaction can complement voice interaction in mandatory quiet scenarios and address privacy concerns. To this end, we implement a fine-grained multi-user device-free gesture tracking system on commercial smart speakers.

Published in IEEE MASS 2021.

Intelligent Sensor

In order to automatically control the screen off and on when calling, each phone must have a proximity sensor. Until now, Apple still adopts infrared proximity sensor. However, for a larger screen-to-body ratio, Xiaomi has abandoned the infrared proximity sensor. Instead, we transform the microphone and speaker into an ultrasonic proximity sensor.

National Scientific and Technological Progress Award Second Price.

Indoor Localization

Indoor localization is one of the most important and interesting topic in wireless and mobile systems. Both Apple and Xiaomi have launched their own UWB based indoor localization products. From this background, our team is researching an indoor localization system based on ultrasonic signals. The advantage of our scheme is that there is no need to add any additional chips and antennas, which can save several dollars for each device.