Abstract
In this article, we study an optical wireless ECG monitoring system for an elderly person, using an infrared link between a transmitter placed on the wrist and receivers on the ceiling of a room. It is assumed that the person walks across the room so that the transmission channel varies, which impacts the quality of the transmission and the ECG signal. Signal quality indices (SQIs) are a common measure used to assess ECG signal quality, regardless of acquisition and transmission conditions. Our main contribution is to evaluate the evolution of the SQIs, focusing on the spectral characteristics of ECG, as a function of the reliability of the optical transmission channel evaluated using low layer metrics such as the signal to noise ratio (SNR) and outage probability. For this purpose, we develop a transmission chain in simulation in order to evaluate the two metrics during the walking of the person using a channel model including mobility. The results show that it is possible to ensure satisfactory ECG quality even if the received optical signal is strongly affected by channel variation due to mobility.
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