Title :
Indoor broadcasting via white LEDs and OFDM
Author :
Elgala, Hany ; Mesleh, Raed ; Haas, Harald
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Jacobs Univ. Bremen, Bremen, Germany
fDate :
8/1/2009 12:00:00 AM
Abstract :
Recently, visible light communication (VLC) technology has been gaining attention in both academia and industry. This is driven by the progress of white light emitting diode (LED) technology for solid-state lighting (SSL) and the potential of simultaneously using such LEDs for illumination and indoor wireless data transmission. This paper provides an overview about the technology and describes the physical layer implementation of a VLC system based on a modified version of the classical orthogonal frequency division multiplexing (OFDM) modulation technique. Besides, the paper presents a hardware prototype for short-range broadcasting using a white LED lamp. The OFDM system runs on DSP development boards. Off-the-shelf 9 LEDs and a single photodiode (PD) are utilized to build the analog frontends. The prototype allows investigating the influence of the electrical signal-to-noise ratio (SNR), constellation order, and channel coding on the bit-error performance. Theoretical and experimental results on optical path loss show close match. In this context, the influence of the LED beam angle on the horizontal coverage is highlighted.
Keywords :
OFDM modulation; digital signal processing chips; indoor radio; light emitting diodes; photodiodes; DSP development board; OFDM; bit-error performance; channel coding; electrical signal-to-noise ratio; indoor broadcasting; indoor wireless data transmission; optical path loss; optical wireless technology; orthogonal frequency division multiplexing modulation technique; photodiode; physical layer implementation; solid-state lighting; visible light communication technology; white LED; white light emitting diode; Broadcasting; Communication industry; Communications technology; Data communication; Hardware; Light emitting diodes; OFDM modulation; Physical layer; Prototypes; Solid state lighting; Visible light communication; light emitting diodes; orthogonal frequency division multiplexing; photodiodes;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2009.5277966