A New Channel Selection Strategy for WiFi-Based Vital Sign Sensing Using Respiratory Quality Index

Wifi-based breathing monitoring has attracted much attention in recent years. However, the proper channel and subcarrier selection are not well studied. This paper proposes a new channel fusion strategy based on the respiratory quality index (RQI). The average detection error in a 5-meter experiment is 0.54 BPM, lower than the state-of-the-art channel selection methods.