LiNEV: Visible Light Networking for Connected Vehicles

DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) has been introduced to visible light networking framework for connected vehicles (LiNEV) systems as a modulation and scheme. This is overcome the light-emitting diode (LED) bandwidth limitation, well reduce inter-symbol interference caused by multipath road fading. Due implementation of inverse fast Fourier transform, DC-OFDM suffers from its large peak-to-average power ratio (PAPR), which degrades performance in LiNEV systems, LEDs used vehicles’ headlights have limited power-current linear range. To tackle this issue, discrete transform spread-optical pulse amplitude (DFTS-OPAM) proposed an alternative scheme instead DCO-OFDM. In paper, we investigate system both schemes considering dynamic range LED 3 dB limitations. The simulation results indicate that DCO-OFDM 9 higher PAPR value compared with DFTS-OPAM. Additionally, it demonstrated requires twice one required DFTS-OPAM same high quadrature (QAM) order. Furthermore, findings illustrate when signal significantly exceeds bandwidth, outperforms DFTS-OPAM, lower signal-to-noise at QAM