Hermitian symmetry free optical-single-carrier frequency division multiple access for visible light communication

OPTICS COMMUNICATIONS

卷:415

Article

Azim, Ali W.¹  Le Guennec, Yannis²  Maury, Ghislaine¹ 

[1] Univ Grenoble Alpes, CNRS, Inst Engn, Grenoble INP,IMEP LAHC, F-38000 Grenoble, France

[2] Univ Grenoble Alpes, CNRS, Inst Engn, Grenoble INP,GIPSA LAB, F-38000 Grenoble, France

关键词: Intensity modulation-direct detection;    Optical-orthogonal frequency division multiplexing;    Peak-to-average power ratio;    Optical-single-carrier frequency domain multiple access;   

DOI  :  10.1016/j.optcom.2018.01.036

来源: Elsevier

【 摘 要 】

Optical-orthogonal frequency division multiplexing (O-OFDM) is an effective scheme for visible light communications (VLC), offering a candid extension to multiple access (MA) scenarios, i.e., O-OFDMA. However, O-OFDMA exhibits high peak-to-average power ratio (PAPR), which exacerbates the non-linear distortions from the light emitting diode (LED). To overcome high PAPR while sustaining MA, optical-single-carrier frequency-division multiple access (O-SCFDMA) is used. For both O-OFDMA and O-SCFDMA, Hermitian symmetry (HS) constraint is imposed in frequency-domain (FD) to obtain a real-valued time-domain (TD) signal for intensity modulationdirect detection (IM-DD) implementation of VLC. Howbeit, HS results in an increase of PAPR for O-SCFDMA. In this regard, we propose HS free (HSF) O-SCFDMA (HSFO-SCFDMA). We compare HSFO-SCFDMA with several approaches in key parameters, such as, bit error rate (BER), optical power penalty, PAPR, quantization, electrical power efficiency and system complexity. BER performance and optical power penalty is evaluated considering multipath VLC channel and taking into account the bandwidth limitation of LED in combination with its optimized driver. It is illustrated that HSFO-SCFDMA outperforms other alternatives. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free