Modified μ-law Companding For LED Nonlinearity Alleviation in DCO-OFDM VLC System

Chaowen Yan; Jianping Wang; Huimin Lu; Yinjia Shi

doi:10.1117/12.2262278

7 October 2016 Modified μ-law Companding For LED Nonlinearity Alleviation in DCO-OFDM VLC System

Chaowen Yan, Jianping Wang, Huimin Lu, Yinjia Shi

Proceedings Volume 9902, Fourth International Conference on Wireless and Optical Communications; 990206 (2016) https://doi.org/10.1117/12.2262278
Event: Fourth International Conference on Wireless and Optical Communications, 2016, Beijing, China

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.

Citation Download Citation

Chaowen Yan, Jianping Wang, Huimin Lu, and Yinjia Shi "Modified μ-law Companding For LED Nonlinearity Alleviation in DCO-OFDM VLC System", Proc. SPIE 9902, Fourth International Conference on Wireless and Optical Communications, 990206 (7 October 2016); https://doi.org/10.1117/12.2262278

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