Tunnel visible light communication system utilizing frequency domain pre-equalization technique

Abstract

Simultaneously improving the communication speed and equalizing the nonlinear frequency response are still challenging for tunnel visible light communication (TVLC) system. Here, we propose and numerically investigate a frequency domain pre-equalization scheme for discrete multitone (DMT) modulation TVLC system. The amplitude of each subscriber is appropriately pre-equalized by optimized nonlinear compensation parameters. Simulation results demonstrate that our proposed equalization technique can resist the channel attenuation of the signal high-frequency part and further flatten the nonlinear channel response. Without forward error correction technique, the bit error ratio (BER) performance can reach 7.66×10⁻⁶ in a 2.05 Gbit/s DMT-TVLC system.

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