Abstract
This paper analyzes the performances of indoor optical wireless data transmissions based on
unipolar orthogonal frequency division multiplexing (OFDM). In particular, it is shown that using
frequency-domain pre-equalization can provide benefits in terms of the reduction in the required
optical transmit power for a given desired bit error rate (BER) from uncoded transmissions. Known
for its power efficiency, asymmetrically clipped optical OFDM (ACO-OFDM) is considered as a
unipolar modulation scheme for intensity modulation with direct detection (IM/DD). In addition,
flip-OFDM is also considered as an alternative unipolar modulation scheme which is known to be as
power efficient as ACO-OFDM. For both ACO-OFDM and flip-OFDM, analytical and simulation results
show that using pre-equalization can save up to
${\bf 2}$
dB of transmit optical power for a typical indoor optical wireless transmission
scenario with the bit rate of
${\bf 10}$
Mbps and the BER target of
${\bf 10^{-5}}$
.
© 2013 IEEE
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