A Visible Light Communication system (VLC)
based on Pulse Amplitude Modulation (PAM-2) with
equalisation of low-complexity is presented. The VLC system
consists of a transmission chain with an off-the-shelf 520 nm
Laser Diode (LD), whose distance from the photodiode at the
receiver is 1.8m. A Minimum Mean Square Linear Equalisation
(MMSE-LE) with 16 taps enables communication to be
performed at a baud rate of 2 Gbaud/s with a measured Bit
Error Rate (BER) above the VLC Forward Error Correction
(FEC) threshold. Digital Signal Processing (DSP) was
performed in offline mode with MATLAB algorithm. Through
the study carried out, it is possible to verify how much linear
equalisation can compensate for the distortions of the
transmission channel through the measured eye diagrams as
well as the number of MMSE-LE taps to obtain optimised
MMSE-LE performances and increase the capacity of the VLC
channel with PAM-2.