1. In-Vehicle Breathing Rate Monitoring Based on WiFi Signals
- Author
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Florian Pfeiffer, Alper Akbilek, Bernd Napholz, and Manzar Hussain
- Subjects
Respiratory rate ,SIMPLE (military communications protocol) ,Computer science ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,020208 electrical & electronic engineering ,Phase (waves) ,020206 networking & telecommunications ,Data_CODINGANDINFORMATIONTHEORY ,02 engineering and technology ,Amplitude ,Network interface controller ,Channel state information ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,In vehicle ,Antenna (radio) ,Computer Science::Information Theory - Abstract
In this work, we propose in-vehicle breathing rate monitoring by exploiting channel state information (CSI) available in WiFi signals. The system uses CSI phase and amplitude extracted from a commercial-off-the-shelf (COTS) network interface card (NIC). We provide a simple two-path radio signal propagation model to explain the complementary relation between CSI phase and amplitude. Analyzing CSI phase and amplitude separately, we estimate the breathing rate of a person in a stationary vehicle. We conduct measurements using different antenna positions and with single and multiple antennas at the receiver. Verifying the measurement results with real-time counting of the breathing rate, we show that using multiple antennas significantly improve the performance of the system.
- Published
- 2021
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