RoMD: Robust device-free motion detection usin PHY layer information

With the proliferation of context-aware services and human-computer interaction scenarios, the novel techniques of motion detection have attracted growing interests. There are many products which use camera, infrared sensors, RF, etc. With more Wi-Fi devices in homes and the ability to measure the PHY layer infomation, Wi-Fi based motion detection has attracted more attention than before. In this poster, we present the design of RoMD, a robust motion detection system which uses existing Wi-Fi devices. Changing environment and human movement would cause significant pattern changes of the CSI amplitude over time. The basic idea of RoMD is to eliminate the “bad antennas” and interference of CSI measurements so that the features we extract would not be affected by changing environments. To achieve this goal, we implement an efficient data processing structure to accurately extract the feature and identify the human motion. Then, we simplely evaluate the scheme and demonstrate feasibility. And finally, we introduce the work in the future.