Fig. 1. Indoor VLC AP layout and user projection example on horizontal plane

Fig. 2. Undirected graphs in different situations correspond to network in Fig. 1. (a) Undirected graph of network shown in Fig. 1, where the vertexes denote any two UEs share the same AP with each other; (b) colored graph after applying the Dsatur algorithm^[9]; (c) reallocation result when pilots are insufficient; (d) reallocation result when pilots are sufficient

Fig. 3. Number of admitted users versus number of pilots τ

Fig. 4. Number of admitted users versus m

Fig. 5. Number of admitted users versus pilot emission power

Fig. 6. MSE versus number of APs

Table 1. Simulation parameters