DFT-spread combined with clipping method to reduce the PAPR in VLC-OFDM system

Orthogonal frequency division multiplexing（OFDM） is an attractive technique to realize high data rate in light emitting diodes（LEDs）-based visible light communication（VLC）. However, high peak-to-average power ratio（PAPR） of OFDM makes VLC-OFDM very sensitive to the nonlinearity of LEDs. In this pape...

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Bibliographic Details
Published in:Optoelectronics letters 2017-05, Vol.13 (3), p.229-232
Main Author: 李阳 邓锐 何晶 何松华 陈林
Format: Article
Language:English
Subjects:
Bit error rate
Fourier transforms
Lasers
Light emitting diodes
Optical communication
Optical Devices
Optics
Organic light emitting diodes
Orthogonal Frequency Division Multiplexing
Photonics
Physics
Physics and Astronomy
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Summary:Orthogonal frequency division multiplexing（OFDM） is an attractive technique to realize high data rate in light emitting diodes（LEDs）-based visible light communication（VLC）. However, high peak-to-average power ratio（PAPR） of OFDM makes VLC-OFDM very sensitive to the nonlinearity of LEDs. In this paper, the discrete Fourier transform-spread（DFT-spread） combined with clipping method is proposed to reduce the PAPR of OFDM signal in VLC system. Combining simulation with experiment, a performance comparison is made among conventional OFDM, DFT-spread-OFDM, and clipped DFT-spread-OFDM with different clipping ratios（CRs） in a single LED-based VLC system. The experimental results show that the proposed clipped DFT-spread-OFDM method can effectively improve the system performance compared with the other two methods. At the optimum signal peak-to-peak（PTP） value, by using the clipped DFT-spread-OFDM scheme with CR at 8 dB, the bit error rate（BER） of the system can be reduced from 0.003 7 to 0.000 287.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-017-7057-y