Abstract
Recently, visible light communication (VLC) based on LEDs has attracted much attention. In order to realize multiusers indoor VLC systems, a reasonable channel model considering random shadowing, which is first proposed to the best of our knowledge, is significant. Taking the nonquantitative obstructions with random movement into account, by introducing the Poisson process and the probability density function, we propose a weighting function and set up a channel model. The expressions of the received optical power, the horizontal illuminance and the impulse responses are given. The verification of the model's feasibility is presented through simulation. Moreover, based on the proposed channel model, the simulation analysis of the effect of random shadowing on communication performance is conducted, and the corresponding simulation optimization is also made.
Highlights
Visible light communication (VLC) utilizing white LEDs has drawn considerable attention because of its multiple advantages such as less power consumption, high transmission rate, unlicensed spectrum, enhanced security, anti-electromagnetic interference and so on [1], [2]
With comparison to the results presented by the conventional channel model for an empty room, the effect of random shadowing on communication performance is analyzed
In this paper, considering the effect of the random shadowing induced by the non-quantitative and randomly mobile obstructions, we study the channel characteristics of indoor visible light communication (VLC) systems
Summary
Visible light communication (VLC) utilizing white LEDs has drawn considerable attention because of its multiple advantages such as less power consumption, high transmission rate, unlicensed spectrum, enhanced security, anti-electromagnetic interference and so on [1], [2]. For indoor VLC systems, full-duplex mode, multipath interference, multi-users access interference and networking schemes are research hotspots To solve these problems, the reasonable channel model is significant for obtaining channel characteristics. In [9], the shadowing effect caused by the human body is considered for VLC channel characteristics This builds on some simplifying assumptions such as ideal Lambertian source and purely diffuse reflections. The proposed channel model turns out to be feasible, which can obtain channel impulse responses (CIRs) and RMS delay spread at any point in indoor VLC scenario. With comparison to the results presented by the conventional channel model for an empty room, the effect of random shadowing on communication performance is analyzed.
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