Joint rate-brightness control using variable rate mppm for led based visible light communication systems
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Date
2013
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Abstract
LED based lighting systems provide an opportunity
for data transmission in addition to their traditional use as source
of illumination. Brightness control is required to achieve either
desired level of illumination or to achieve energy conservation.
Conventionally, simultaneous data transmission as well as brightness
control is achieved using two different modulation schemes.
Either pulse width modulation or pulse amplitude modulation is
used for brightness control and some variants of pulse position
modulation are employed for data transmission. The need for two
different modulation schemes, to meet the dual objective, makes
the system design complex. In this paper we propose variable-rate
multi-pulse-position-modulation (VR-MPPM), for LED based
visible light communication system, to achieve joint brightness
control and data transmission. The proposed approach eradicates
the need for either pulse width modulation or pulse amplitude
modulation and still achieves the brightness control. Encoder
and decoder algorithms for VR-MPPM realization are developed
and are implemented on the hardware testbed. Experimental
results revealing the effect of brightness level variation on symbol
error rate are also provided. Existence of an underlying tradeoff
between achievable resolution for brightness control and the
corresponding successful data transmission rate is recognized. To
exploit this trade-off, an optimization problem is formulated.
Description
Keywords
Visible LighCommunication, Multi Pulse Position Modulation, Variable Rate MPPM, Brightness Control
Citation
Siddique, A., & Tahir, M. (2013). Joint Rate-Brightness Control using Variable Rate MPPM for LED Based Visible Light Communication Systems