Anti-Fall: A Non-intrusive and Real-time Fall Detector Leveraging CSI from Commodity WiFi Devices

TL;DR

Anti-Fall is a real-time, non-intrusive fall detection system using commodity WiFi CSI data, achieving higher accuracy and fewer false alarms than previous methods.

Contribution

It introduces the use of CSI phase difference as a key feature for fall detection, a novel approach in this context.

Findings

10% higher detection rate than WiFall

10% fewer false alarms on average

Effective in multiple indoor scenarios

Abstract

Fall is one of the major health threats and obstacles to independent living for elders, timely and reliable fall detection is crucial for mitigating the effects of falls. In this paper, leveraging the fine-grained Channel State Information (CSI) and multi-antenna setting in commodity WiFi devices, we design and implement a real-time, non-intrusive, and low-cost indoor fall detector, called Anti-Fall. For the first time, the CSI phase difference over two antennas is identified as the salient feature to reliably segment the fall and fall-like activities, both phase and amplitude information of CSI is then exploited to accurately separate the fall from other fall-like activities. Experimental results in two indoor scenarios demonstrate that Anti-Fall consistently outperforms the state-of-the-art approach WiFall, with 10% higher detection rate and 10% less false alarm rate on average.