  One of the main aims of indoor visible light communication (VLC) systems is
to deliver a high data rate service in single user and in multiuser scenarios.
A key obstacle is the ability of the indoor VLC channel to support high data
rates in the scenarios of interest. Here, we assess the potential of a
multi-branch transmitter (MBT) and its use to achieve higher data rates in
single user and multiuser indoor VLC systems. For the single user VLC system,
the performance of the MBT is examined with a wide field of view (W-FOV)
receiver and an angle diversity receiver (ADR) while for the multiuser VLC
system we evaluate the performance of the MBT with a non-imaging angle
diversity receiver (NI-ADR). In addition, for the multiuser VLC system, we
propose subcarrier multiplexing (SCM) tones to allocate an optimum transmitter
to each user. Furthermore, wavelength division multiplexing (WDM) is examined
to support higher data rates for each user while using on-off-keying (OOK)
modulation. In addition, the impact of the user's mobility on the multi-user
VLC system performance is studied. The effect of diffuse reflections, mobility
and lighting constraints are taken into account. In addition, the effect of
co-channel interference (CCI) is considered in the multiuser VLC system.
