PAM-SCFDE for Optical Wireless Communications

Multipath dispersion is a serious challenge in visible light communication (VLC) systems as these systems are used for indoor applications where there can be many reflections of the transmitted signal from the ceiling, walls, equipment, etc. These reflected signals cause intersymbol interference in...

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Bibliographic Details
Published in:Journal of lightwave technology 2015-07, Vol.33 (14), p.2938-2949
Main Authors: Nuwanpriya, Asanka, Siu-Wai Ho, Zhang, Jian Andrew, Grant, Alex J., Lin Luo
Format: Article
Language:English
Subjects:
Bit error rate
Light emitting diodes
Modulation
OFDM
Optical pulses
Optical receivers
Optical transmitters
Optical wireless
optical wireless communications
pulse amplitude modulation (PAM)
single carrier systems with frequency domain equalization (SCFDE)
visible light communications
Wireless communications
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Summary:Multipath dispersion is a serious challenge in visible light communication (VLC) systems as these systems are used for indoor applications where there can be many reflections of the transmitted signal from the ceiling, walls, equipment, etc. These reflected signals cause intersymbol interference in the receiver and can degrade the performance of the system considerably. Orthogonal frequency-division multiplexing (OFDM) for optical wireless communications was introduced to mitigate multipath dispersion and has been well investigated in the literature. Recently, single-carrier systems with frequency-domain equalization (SCFDE) have been proposed as alternatives to OFDM. In this paper, we present pulse amplitude modulated SCFDE (PAM-SCFDE) to mitigate multipath dispersion in VLC systems. We also compare the proposed PAM-SCFDE with existing OFDM and SCFDE techniques for optical wireless communications in terms of analytical and simulated bit-error-rate (BER) performance, power-spectral efficiency, peak-to-average power ratio (PAPR), and overall system complexity. The proposed PAM-SCFDE requires lower per bit signal-to-noise ratio to achieve a BER of 10 -4 or smaller for modulation sizes common in practice, both with and without considering the effects of light-emitting diode transmitters, such as nonlinearity, forward current restriction, and bandwidth limitation. Furthermore, it exhibits better power efficiency for data rates less than 3 bit/s/Hz, lower PAPR and system complexity compared to other systems.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2015.2424456