Adaptive wireless optical transmission scheme for health monitoring system

This paper presents an indoor optical wireless communications using adaptive wireless optical transmission scheme for health monitoring system. Since radio frequency (RF) networks can present electromagnetic disturbances with medical devices, an alternative system based on infrared (IR) technology is studied. In this scheme, optical wireless communication is proposed to transmit the obtained measurements from sensors to a central node and a medical center using intensity modulation-direct detection (IM/DD) with on-off-keying (OOK) modulation. An image sensor is utilized as a receiver, and the signal to noise ratio (SNR) at the image sensor is analyzed with consideration of the half power angle of the optical source, the transmitted power, data rate, and the patient´s location. The analytical results indicate that by employing the adaptive transmission scheme, the required SNR of 13.6 dB is achieved.