Relay-Assisted OFDM Transmission for Indoor Visible Light Communication
Kizilirmak, Refik Caglar and Uysal, Murat
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Abstract
In this study, we investigate a relay-assisted visible light
communication (VEC) system where an intermediate light source cooperates
with the main light source. Specifically, we consider two light sources
in an office space; one is the information source employed on the
ceiling and the other one is a task light mounted on a desk. Our system
builds upon DC biased optical orthogonal frequency division multiplexing
(DCO-OFDM). The task light performs amplify-and-forward relaying to
assist the commmunication and operates in half-duplex mode. We
investigate the error rate performance of the proposed OFDM-based
relay-assisted VEC system. Furthermore, we present joint AC and DC
optimal power allocation in order to improve the performance. The DC
power allocation is controlled by sharing the number of LED chips
between the terminals and the AC power allocation decides the fraction
of the information signal energy to be consumed at the terminals.
Simulation results reveal that the VLC. system performance can be
improved via relay-assisted transmission and the performance gain as
much as 6 dB can be achieved.... Show more Show less