Abstract

The orthogonal frequency division multiplexing (OFDM) transmission is a promising candidate for visible light communication (VLC) applications. However, the nonlinearity in the optical power emitted by the high-power light-emitting diode (HPLED) as a function of current and temperature implies drastic OFDM-VLC performance degradation. The first part of this work experimentally confirms and models this degradation due to temperature in a white HPLED. The higher attenuation at high frequencies, which is inherent to the HPLED and which is accentuated by the effect of the intrinsic capacitance of the photodiode, is another factor of degradation due to the reduction in the signal-to-noise ratio (SNR) at the receiver for such frequencies. For the mitigation of these combined effects, we propose a predistortion and a digital pre-equalization scheme using a luminous feedback signal at the transmitter side. The VLC system is modeled so that the operating points are mathematically deduced and evaluated by simulations and by an experimental setup. By allowing the linearization of the transmitted light signal and the maintenance of a uniform SNR among all OFDM subcarriers, the performance improvement is confirmed in comparison with other schemes, such as a VLC system without predistortion, predistortion with fixed parameters, as well as a simple post-equalization.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Hybrid time-frequency domain equalization for LED nonlinearity mitigation in OFDM-based VLC systems

Jianfeng Li, Zhitong Huang, Xiaoshuang Liu, and Yuefeng Ji
Opt. Express 23(1) 611-619 (2015)

Low complexity OFDM VLC system enabled by spatial summing modulation

Yanbing Yang, Chen Chen, Pengfei Du, Xiong Deng, Jun Luo, Wen-De Zhong, and Liangyin Chen
Opt. Express 27(21) 30788-30795 (2019)

On the study of the relation between linear/nonlinear PAPR reduction and transmission performance for OFDM-based VLC systems

Huimin Lu, Yang Hong, Lian-Kuan Chen, and Jianping Wang
Opt. Express 26(11) 13891-13901 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (14)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (5)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (23)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription