| Summary: | Low power consumption and high bit rate are the most important features of
visible light communication (vlc) systems. These features are always the main target
of any communication system. This study focuses on enhancing data rates and
optimizing power consumption in vlc systems. To improve the data rate, multipleinput
multiple-output (mimo) has been employed and this technique has an inherited
property of combining the data streams and multiplying the data rate. The system was
upgraded from a 2×2 to a 4×4 mimo-vlc configuration. To optimize power
consumption, two power allocation schemes, gain ratio power allocation (grpa) and
normalized gain difference power allocation (ngdpa), were applied to the 4×4
mimo-vlc system. Additionally, a novel modified-ngdpa (m-ngdpa) scheme
was proposed, extending the coverage area from 3.14 m² to 4.52 m² and enhancing the
sum rate at the coverage boundaries. The mathematical model of the proposed system
was presented. The simulation result shows that the 4×4 mimo-vlc system achieves
a sum rate of 268 mbps over a 10 mhz bandwidth within a circular coverage area of 1
m radius (3.14 m²). Simulation results indicate that while ngdpa provides a higher
sum rate, grpa demonstrates better overall energy efficiency.
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