  Visible light communication (VLC) is an emerging technology that enables
broadband data rates using the visible spectrum. In this paper, considering
slow beam steering where VLC beam directions are assumed to be fixed during a
transmission frame, we find the steering angles that simultaneously serve
multiple users within the frame duration and maximize the data rates. This is
achieved by solving a non-convex optimization problem using a grid-based search
and majorization-minimization (MM) procedure. Subsequently, we consider
multiple steerable beams with a larger number of users in the network and
propose an algorithm to cluster users and serve each cluster with a separate
beam. We optimize the transmit power of each beam to maximize the data rates.
Finally, we propose a non-orthogonal multiple access (NOMA) scheme for the beam
steering and user clustering scenario, to further increase the data rates of
the users. The simulation results show that the proposed beam steering method
can efficiently serve a high number of users, and with power optimization, a
data rate gain up to ten times is possible. The simulation results for NOMA
suggests an additional 10 Mbps sum rate gain for each NOMA user pair.
