Cooperative transmission scheme to address random orientation and blockage events in VLC systems

Abstract

Visible light communication (VLC) is a promising communication technology that paves the way to the Internet of Things. The forthcoming Industry 4.0 requires reliable high-speed communication links, which can be easily fulfilled with the massive adoption of the VLC technology. However, in VLC indoor communication environments, line-of-sight link blockages and strong misalignment losses between the lightemitting diode (LED) transmitters and the photodiode (PD) receivers are usual problems that must be tackled. This paper proposes a coordinated multi-point (CoMP) transmission technique to deal with both issues, and carries out a detailed evaluation of the VLC system performance as function of the PD receiver orientation and the density of obstacles in different scenarios. The proposed cooperative transmission scheme demonstrates an improvement in the average cell data rate and outage probability performance and, as a consequence, justifies the use of CoMP techniques to provide reliable VLC services in ultra-dense small cell scenarios indoors.

Effects of LED Non-linear Response and Waveform Settings on Multi-Cell VLC System Deployments

“…In spite of the changes in m, and the nonlinear current versus voltage model that is underlying for the LED, the mean power P DC,AC remains approximately constant. It allows us to infer that a multi-cell VLC deployment [9] can adjust the value m to optimize coverage area, without varying the light intensity in the room [10]. Note that P DC,AC is a variable that stands for the measured electrical power that is dissipated in the LED.…”

CoMP-JT Scheme for D2D Communication in Industrial LiFi Networks

“…Thus, the coverage boundary of the D2D communication range forms a cluster of bias-based ROI points in (24). These points help to calculate the parameters in an industrial LiFi network.…”

Lights and Shadows: A Comprehensive Survey on Cooperative and Precoding Schemes to Overcome LOS Blockage and Interference in Indoor VLC

“…A potential limitation of this technique is notable in ultra-dense VLC networks, where users located at the cell-center areas also suffer from a high inter-cell interference level coming from adjacent lamps [ 111 ]. That is, managing the transmission resources, e.g., allocating frequency sub-bands in an O-OFDM scheme, is more complex and less efficient as the network becomes more dense.…”

“…One of the presented pre-defined JT-CoMP schemes is thoroughly studied in [ 111 ] for a scenario where the orientation of the receiver, i.e., the PD, and the density of obstacles vary. This work shows the robustness and reliability of pre-defined JT-CoMP schemes by reducing the outage probability and increasing average cell data rate considerably.…”