Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems

Ruqi Zhang; Jianfeng Li; Zhitong Huang; Yuefeng Ji

doi:10.3788/COL201513.072302

Journals >Chinese Optics Letters >Volume 13 >Issue 7 >Page 072302 > Article

Chinese Optics Letters
Vol. 13, Issue 7, 072302 (2015)

Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems

Ruqi Zhang, Jianfeng Li^*, Zhitong Huang, and Yuefeng Ji

Author Affiliations

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

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DOI: 10.3788/COL201513.072302 Cite this Article Set citation alerts

Ruqi Zhang, Jianfeng Li, Zhitong Huang, Yuefeng Ji. Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems[J]. Chinese Optics Letters, 2015, 13(7): 072302 Copy Citation Text

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Abstract

In visible light communication, orthogonal frequency division multiplexing (OFDM) is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode (LED) suppresses the transmission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlinearity. Therefore, a pre-equalization scheme which suppresses the low frequency part of the OFDM signal and enhances the high frequency part can decrease the impact of LED nonlinearity. The experimental results show that the bit-error rate performance is largely enhanced by the pre-compensation.