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Proceedings Paper

Modified μ-law Companding For LED Nonlinearity Alleviation in DCO-OFDM VLC System
Author(s): Chaowen Yan; Jianping Wang; Huimin Lu; Yinjia Shi
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Paper Abstract

In this paper, the direct current (DC)-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) system using modified μ-law companding is modeled and investigated. The simulation results reveal that the high peak to average power ratio (PAPR) induced by multi-carrier modulation (MCM) and DC bias, can aggravate signal distortion that is caused by the nonlinear characteristic of light emitting diode (LED). Thus, a pre-distortion method based on modification of μ-law companding is proposed for DCO-OFDM VLC system to resolve this problem. With the proposed method, the system can achieve a good performance of PAPR reduction and bit error rate (BER), compared to the original DCO-OFDM VLC system. It is demonstrated that the modified μ-law companding is appropriate to alleviate LED nonlinearity without degradation of the signal quality in DCO-OFDM VLC system.

Paper Details

Date Published: 7 October 2016
PDF: 6 pages
Proc. SPIE 9902, Fourth International Conference on Wireless and Optical Communications, 990206 (7 October 2016); doi: 10.1117/12.2262278
Show Author Affiliations
Chaowen Yan, Univ. of Science and Technology Beijing (China)
Jianping Wang, Univ. of Science and Technology Beijing (China)
Huimin Lu, Univ. of Science and Technology Beijing (China)
Yinjia Shi, Univ. of Science and Technology Beijing (China)


Published in SPIE Proceedings Vol. 9902:
Fourth International Conference on Wireless and Optical Communications
Maode Ma, Editor(s)

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