Abstract
Visible light communication (VLC) systems with a direct current-biased optical
orthogonal frequency division multiplexing (DCO-OFDM) architecture suffers from the
well-known problem of high peak-to-average power ratio (PAPR). A DCO-OFDM signal at the
input of the light emitting diode (LED) with high PAPR can experience clipping due to
its limited dynamic-range. This causes distortion and degradation of the signal quality,
forcing a large power back-off, and so leading to an inefficient use of the LEDs. In
order to resolve this problem, we propose to apply a power derating reduction technique
at the VLC transmitter based on a modification of the active constellation extension
(ACE) method with two important changes: a better predictor of the power derating than
the PAPR, the cubic metric (CM), and a more effective clipping stage. With the proposed
method, we achieve a significant CM reduction as large as 7.1 dB, which contributes to a
noticeable gain in the input power back-off of 2.5 dB or an important reduction of
signal distortion, and a greater illumination to communication efficiency (ICE), higher
than 30%.
© 2015 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription
Add to BibSonomy