23 February 2017 Polarity separating optical orthogonal frequency division multiplexing for free-space visible light communications
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Abstract
A modulation format, polarity separating optical orthogonal frequency division multiplexing (PSO-OFDM), is proposed to mitigate the light-emitting diode (LED) nonlinearity for visible light communication systems. A polarity separator is used to divide the OFDM signal in time domain x ( t ) into two parts: x + ( t ) and x ( t ) , which will be transmitted parallelly from the different LEDs and overlap linearly in free space to realize PSO-OFDM. The experimental results demonstrate that PSO-OFDM has high spectral efficiency and suffers less nonlinear distortions than other methods. Employing PSO-OFDM, the modulation index and bit error rate performance can be significantly enhanced.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jianfeng Li, Jianfeng Li, Zhitong Huang, Zhitong Huang, Jianke Li, Jianke Li, Xiaoshuang Liu, Xiaoshuang Liu, } "Polarity separating optical orthogonal frequency division multiplexing for free-space visible light communications," Optical Engineering 56(2), 026118 (23 February 2017). https://doi.org/10.1117/1.OE.56.2.026118 . Submission: Received: 10 September 2016; Accepted: 6 February 2017
Received: 10 September 2016; Accepted: 6 February 2017; Published: 23 February 2017
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