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Abstract
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Wireless body area networks (WBANs) can be utilized for remote observation of
patients and old individuals at home as medical applications. Visible light communication (VLC)
has been proposed as an efficient technology for medical WBANs. By considering the key
feature of VLC systems, VLC can be used in extra-WBAN links from node (patients) to access
point. Since symbol error rates (SERs) is critical metric in medical WBANs, we propose joint
power and subcarrier allocation scheme in VLC systems to minimize SERs subject to transmit
power limitation, and required minimum rate for each user. Here, the improved channel model is
utilized for VLC link between different numbers of patients and access point which is considered
received signal power dependence noise (RSN). In addition, the effect of tilting assisted receiver
on resource allocation is evaluated. Moreover, to address real-world challenges like patient
movement and obstructions, we propose incorporating wall-mounted mirrors to reflect light
signals and thus maintain reliable communication, considering both line-of-sight (LoS) and
non-line-of-sight (NLoS) transmission. The numerical results indicate that RSN and receiver
tilting have a significant impact on the allocation of resources. Furthermore, it is shown that
outage probability can approach zero using the NLoS link of proposed wall-mounted mirrors.
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