On the Nonlinear Distortion Characterization in Photovoltaic Modules for Visible Light Communication

TL;DR

This paper investigates the nonlinear distortion effects in photovoltaic modules used for visible light communication, revealing the impact of illumination levels and proposing methods to mitigate distortion for improved data transmission.

Contribution

It characterizes PV module nonlinearities under typical indoor lighting and introduces two effective distortion mitigation techniques for VLC systems.

Findings

Nonlinear distortion increases under typical indoor illumination.

An optimal illuminance exists for minimal bit-error rate.

Proposed mitigation methods significantly reduce BER.

Abstract

Photovoltaic (PV) modules have been employed in visible light communication (VLC) for simultaneous energy harvesting and data reception. A PV-based receiver features easy optical alignment and self-powered operation. It is commonly assumed that PV modules in VLC have a linear optical-electrical response, which is generally true under high illumination levels. This paper will illustrate the exacerbated PV's nonlinear distortion when under typical indoor illumination. The nonlinearity of a PV module for different numbers of PV cells is also characterized. We investigated the transmission performance of a 1-Mbit/s PAM4 signal under different illuminance. Experimental results show that the bit-error rate (BER) first decreases and then increases with the increasing illuminance. Thus, an optimal illuminance to minimize BER exists. In addition, we demonstrated two distortion mitigation methods, namely localized distortion compensation lighting and post-distortion compensation. BER reduction from 3.2x10-1 to 2.6x10-3 and 2.8x10-2 to 1.5x10-2 are achieved with the two respective schemes.