Fig. 1. Indoor visible light communication system model based on one-way double-hop relay-and-forward MIMO-OFDM

Fig. 2. Diagram of relay-and-forward MIMO-OFDM visible light communication system structure based on PARATUCK2 model

Fig. 3. Transmitting signal pilot design in MIMO-OFDM visible light communication

Fig. 4. Simulated indoor visible light communication environment

Fig. 5. Comparison of NMSE estimated in each part of channel. (a) Complete channel estimation; (b) channel estimation between relay and receiver; (c) channel estimation between light source and inter-relay; (d) relay gain estimation

Fig. 6. Comparison of iterations