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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Integration of frequency modulated constant envelope technique with ADO-OFDM to impede PAPR in VLC
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Integration of frequency modulated constant envelope technique with ADO-OFDM to impede PAPR in VLC

机译：频率调制恒定包络技术与ADO-OFDM在VLC中妨碍PAPR的集成

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摘要

A novel technique of combating the effects of high peak to average power ratio (PAPR) arising due to the nonlinearity of the LED in a typical optical-OFDM (O-OFDM) for visible light communication (VLC) systems used in optical wireless channel (OWC) is proposed in this research work. The concept of constant envelope (CE) using frequency modulation (FM) for a composite O-OFDM system formed by uniting Asymmetrically Clipped Optical OFDM (ACO-OFDM) and Direct Current biased Optical OFDM (DCO-OFDM) termed as ADO-OFDM is mathematically presented with its numerical simulation results. The proposed system FM-CE-ADO-OFDM shows improvement in the PAPR with narrowing down to the least possible 0 dB theoretically. The analysis is extended to be compared with the phase modulation (PM) technique of CE-OFDM. The magnitude of phase discontinuity in the two systems is evaluated in the form of metrics yielding favorable results for the proposed system. This system is as spectrally efficient as the DCO-OFDM and as power efficient as the ACO-OFDM with the added advantage of major reduction in the effects due to PAPR arising as a result of the nonlinearity of the LED. The so formed FM-CE-ADO-OFDM is fed to the LED biased in the linear most region of its operation for simulation purpose. We also evaluate the depth of modulation required to obtain least bit error rate (BER). The frequency modulation at 30% depth has been observed to give suitable performance. The entire system is evaluated for an OWC length of 2m resembling the indoor illumination scenario. The receiver sensitivity shows an improvement of 1.2 dB at the FEC threshold for the proposed system.
机译：打击高的峰均功率比（PAPR）的影响而产生由于LED的典型的光学-OFDM（O-OFDM）的非线性用于可见光通信的新技术在光学无线信道使用（VLC）系统（ OWC）在本研究工作中提出。使用用于通过单位不对称剪裁的光学OFDM（ACO-OFDM）和直流偏置光学OFDM（DCO-OFDM）而形成的复合O-OFDM系统的常规包络（FM）的概念，并且称为ADO-OFDM在数学上呈现了其数值模拟结果。所提出的系统FM-CE-ADO-OFDM显示PAPR的改进，在理论上，PAPR的缩小为最小0 dB。扩展分析与CE-OFDM的相位调制（PM）技术进行了比较。两种系统中的相位不连续性的大小以指标的形式评估，从而产生所提出的系统的有利结果。该系统与DCO-OFDM的光谱有效，并且作为ACO-OFDM的功率有效，并且由于LED的非线性而导致的PAPR由于PAPR引起的效果的主要减小。如此形成的FM-CE-ADO-OFDM被馈送到在其线性大多数区域的LED中偏置其操作的仿真目的。我们还评估获得最小误码率（BER）所需的调制深度。已经观察到30％深度的频率调节以提供适当的性能。整个系统被评估为类似于室内照明场景的2M的OWC长度。接收器灵敏度显示了所提出的系统的FEC阈值的1.2dB的改进。

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