Decision-directed iterative methods for PAPR reduction in optical wireless OFDM systems

OPTICS COMMUNICATIONS

卷:389

Article

Azim, Ali W.¹  Le Guennec, Yannis¹  Maury, Ghislaine¹ 

[1] Univ Grenoble Alpes, IMEP LAHC, 3 Parvis Louis Neel,CS 50257, F-38016 Grenoble, France

关键词: Intensity modulation-direct detection;    Optical-orthogonal frequency division;    multiplexing;    Peak-to-average power ratio;    Iterative decoding;    Clipping distortion;   

DOI  :  10.1016/j.optcom.2016.12.026

来源: Elsevier

【 摘 要 】

In this paper, we propose two iterative decision-directed methods for peak-to-average power ratio (PAPR) reduction in optical-orthogonal frequency division multiplexing (O-OFDM) systems. The proposed methods are applicable to state-of-the-art intensity modulation-direct detection (IM-DD) O-OFDM techniques for optical wireless communication (OWC) systems, including both direct-current (DC) biased O-OFDM (DCO-OFDM), and asymmetrically clipped O-OFDM (ACO-OFDM). Conventional O-OFDM suffers from high power consumption due to high PAPR. The high PAPR of the O-OFDM signal can be counteracted by clipping the signal to a predefined threshold. However, because of clipping an inevitable distortion occurs due to the loss of useful information, thus, clipping mitigation methods are required. The proposed iterative decision-directed methods operate at the receiver, and recover the lost information by mitigating the clipping distortion. Simulation results acknowledge that the high PAPR of O-OFDM can be significantly reduced using clipping, and the proposed methods can successfully circumvent the clipping distortions. Furthermore, the proposed PAPR reduction

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