Abstract
Optical Wireless Communication (OWC) refers to transmission in unguided propagation media through the use of optical carriers, i.e., visible, Infrared (IR), and Ultraviolet (UV) bands. In this paper, we focus on indoor Visible Light Communication (VLC)-based Medical Body Sensor Networks (MBSNs) which allow the Light Emitting Diodes (LEDs) to communicate between on-body sensors/subdermal implants and on-body central hubs/monitoring devices while also serving as a luminaire. Since the Quality-of-Service (QoS) of the communication systems depends heavily on realistic channel modeling and characterization, this paper aims at presenting an up-to-date survey of works on channel modeling activities for MBSNs. The first part reviews existing IR-based MBSNs channel models based on which VLC channel models are derived. The second part of this review provides details on existing VLC-based MBSNs channel models according to the mobility of the MBSNs on the patient’s body. We also present a realistic channel modeling approach called site-specific ray tracing that considers the skin tissue for the MBSNs channel modeling for realistic hospital scenarios.
Highlights
O PTICAL Wireless Communication (OWC) has emerged as a promising technology for 6G and beyond communication networks
Only diffused rays are observed in the Channel Impulse Response (CIR) of Fig. 9l which is due to the fact that the LoS link between the the detector D3 on Medical Body Sensor Networks (MBSNs) node worn by the patient and the Visible Light Communication (VLC) source placed next to toilet is blocked by separating curtain
In this paper, we presented a comprehensive overview of the VLC-based medical body sensor networks channel modeling which enables researchers to design their systems in best possible QoS
Summary
O PTICAL Wireless Communication (OWC) has emerged as a promising technology for 6G and beyond communication networks. Earlier studies on VLC-based MBSNs [59]–[65] mostly focused on idealistic scenarios where fixed Lambertian reflectance is considered, and the photodetector carrying body and room equipment are neglected [59], [60]. The impact of shadowing on both links, and power optimization at required QoS were investigated in [65] Against this background, we present a comprehensive survey on optical wireless MBSNs channel modeling from past to present by reviewing the existing works and highlighting the key points and challenges. In [51], LoS with perfect alignment and misalignment, and diffuse IR wireless channels were modelled by recursive method for a mobile patient whose location was modelled in both 2D and 3D by uniform and Gaussian distributions inside a room with dimensions of 3 m × 4 m × 2.5 m.
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