  The achievable data rate in indoor wireless systems that employ visible light
communication (VLC) can be limited by multipath propagation. Here, we use
computer generated holograms (CGHs) in VLC system design to improve the
achievable system data rate. The CGHs are utilized to produce a fixed broad
beam from the light source, selecting the light source that offers the best
performance. The CGHs direct this beam to a specific zone on the room's
communication floor where the receiver is located. This reduces the effect of
diffuse reflections. Consequently, decreasing the intersymbol interference
(ISI) and enabling the VLC indoor channel to support higher data rates. We
consider two settings to examine our propose VLC system and consider lighting
constraints. We evaluate the performance in idealistic and realistic room
setting in a diffuse environment with up to second order reflections and also
under mobility. The results show that using the CGHs enhances the 3dB bandwidth
of the VLC channel and improves the received optical power.
