Abstract:
In spite of its spectral efficiency problem, asymmetrically
clipped optical orthogonal frequency division multiplexing
(ACO-OFDM) is one of widely accepted transmission scheme
for intensity modulation/direct detection (IM/DD) based
optical wireless communications. In this paper, we analyze the
potential of rate adaptive based ACO-OFDM scheme to
enhance spectral efficiency of indoor optical wireless
communication. Frequency selective based bit loading
strategy is used to transmit variable number of bits on
different sub carriers having different channel gains. The
result of our evaluations confirms that rate adaptive ACOOFDM
offers better spectral efficiency compared to fixed
modulation formats on all sub carriers.
