Hermitian symmetry free direct current optical-universal filtered multicarrier with companding techniques for intensity modulation/direct detection systems

Vijaya Durga Chintala; Anuradha Sundru

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Hermitian symmetry free direct current optical-universal filtered multicarrier with companding techniques for intensity modulation/direct detection systems

机译：Hermitian symmetry free direct current optical-universal filtered multicarrier with companding techniques for intensity modulation/direct detection systems

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摘要

Hermitian symmetry (HS) is essential for attaining a real-valued signal for intensity modulation and direct detection of visible light communication (VLC). However, HS results in an increase of the peak-to-average power ratio (PAPR). We propose an HS free direct current optical-universal filtered multicarrier (HSF DCO-UFMC) system for VLC. In this technique, the conventional complex UFMC signal is transformed by juxtaposing the real and imaginary components to attain a real valued signal. Therefore, HSF DCO-UFMC offers a great reduction of the PAPR. We also address the nonlinear companding transforms for further reduction of the PAPR of the HSF DCO-UFMC signal. A new companding transform called two μ-law that reduces the PAPR and provides more design flexibility by employing two optimum companding levels and a threshold value is proposed for the HSF DCO-UFMC system. However, this scheme raises the average power level of the signal. So, to maintain a constant average power level, an enhanced two μ-law is proposed to reduce the PAPR effectively. Simulation outcomes exemplify that the proposed HSF DCO-UFMC provides better PAPR reduction. In addition, the proposed two μ-law and enhanced two μ-law can provide an improved PAPR reduction, suppressed side-lobe levels, and better bit error rate performance than the original HSF DCO-UFMC signal.

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来源
《Optical Engineering》 |2020年第9期|096104-1-096104-18|共18页
作者
Vijaya Durga Chintala; Anuradha Sundru;
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作者单位

National Institute of Technology, Electronics and Communication Engineering Department, Warangal, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
关键词
visible light communication; Hermitian symmetry free direct current optical-universal filtered multicarrier; peak-to-average power ratio; companding; solid-state power amplifier;

Hermitian symmetry free direct current optical-universal filtered multicarrier with companding techniques for intensity modulation/direct detection systems

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