Abstract
In this article, we propose an all-optical bidirectional wireless communication system for off-body sensor communication. Optical technology uses infrared (IR) for uplinks and visible light communication (VLC) for downlinks. From numerical simulations, we discuss the impact of body sensor positions on IR and VLC channels. Our goal is to evaluate the possibilities of using optical technology to transmit sensor data for extreme positions such as the ankle, for which the presence of the body creates blockages. In addition, we also consider the variations in orientation of transceivers due to random mobility of body parts during normal movement. Based on a statistical approach, we evaluate performance in terms of outage probability using channel impulse response sets corresponding to the studied scenario, which is health monitoring. Considering a given quality of service, we address trade-offs related to emitting power and data rate. We discuss the results regarding sensor node position and body reflectivity specifically for ankle sensors, corresponding to an extreme but realistic position in the health-monitoring context.
Highlights
Optical wireless communications (OWCs) have been intensively explored in recent decades, in the visible domain [1,2,3,4,5,6]. is is related to the penetration of LEDs for lighting, the switching properties of which make it possible to use them for communication functions
We study the impact of polar and azimuthal angles representing changes of orientations of the transmitter related to the movements of the patient. e results are shown in Figure 7 for the two previous extreme positions, HT 0.2 m and HT 1.5 m. e cumulative density function (CDF) of the gain is plotted for random values of the angles as defined in Table 2 and for φ θ 0, corresponding to a fixed orientation towards the ceiling. e number of position is set to 10,000 in both cases since we have verified that the results converge with this number of samples
Considering the conclusions of the IR and visible light communication (VLC) channels study, the first discussion concerns the overall performance of the IR transmitter for different positions on the body. is analysis can be done for a fixed data rate Rb-IR Rb-VLC
Summary
Optical wireless communications (OWCs) have been intensively explored in recent decades, in the visible domain [1,2,3,4,5,6]. is is related to the penetration of LEDs for lighting, the switching properties of which make it possible to use them for communication functions. Is is related to the penetration of LEDs for lighting, the switching properties of which make it possible to use them for communication functions. Such smart lighting o ers many bene ts, including no license requirements, high bandwidth, and no electromagnetic interference. E use of classical radiofrequency (RF) technologies can be limited in some environments because of potential interference with sensitive devices. Infrared LED power is generally limited according to the laser safety standard [10]. This standard is very restrictive for most noncoherent light sources. This standard is very restrictive for most noncoherent light sources. us, standard for conventional lamps and LEDs [11] is classically used
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