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Long-term exposure to radio frequency waves can have adverse effects on human health. It may cause bad effects especially to elderly people, children, and patients with weak immune systems. On the other hand, visible light communication technologies that use a light-emitting diode (LED) light source and a photodetector to transmit and receive data through visible light have a severe demerit that the...
This paper presents the time hopping (TH) visible light communication (VLC) system for an electromagnetic wave free indoor healthcare. VLC technology has emerged as an alternative wireless communication due to various advantages such as ubiquity, low energy consumption, no radio frequency (RF) radiation, and security against undesired network access. Significant bio-medical signal including the electrocardiography...
Received signal strength indicator (RSSI) is not suitable for fine-grained indoor applications because of imprecise and unreliable readings caused by multipath fading. This paper presents a simple and robust mechanism to improve RSSI by mitigating multipath fading effects in an indoor environment. Signal analysis is provided to explain the rationale of this method. The proposed method provides instantaneous...
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