The movement-rotation (MR) correlation function and coherence distance of VLC channels

Chen, Jiaxuan and Tavakkolnia, Iman and Chen, Cheng and Wang, Zhaocheng and Haas, Harald (2020) The movement-rotation (MR) correlation function and coherence distance of VLC channels. Journal of Lightwave Technology, 38 (24). pp. 6759-6770. 9174785. ISSN 1558-2213 (

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Adaptive transmission based on instantaneous channel state information is an important methodology to improve data rates of mobile users, which requires the periodic update of channel variations. Different from radio frequency (RF) channels, whose variations are governed by Doppler and multi-path effects, visible light communication (VLC) channel variations are mainly related to receiver movements and rotations. In this article, a movement-rotation (MR) correlation function is proposed to measure VLC channel variations with the changes in receiver location and orientation. The correlation function of VLC channel gain in the time domain can then be approximated by the MR correlation function, which is an important criterion for the design of data transmission frames. It is verified that the approximation by MR correlation function can approach the actual simulation and experiment results of VLC channel gain correlation function in the time domain. In addition, experiment and simulation results are presented to investigate variation characteristics of VLC channels in different scenarios. It is shown that a receiver movement of several decimeters or a change of 10-20 degrees in the inclined angle of the receiver is required in a typical scenario in order to observe a distinguishable change of VLC channel gain.