Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission

Qi Wang, Chen Qian, Xuhan Guo, Zhaocheng Wang, David G. Cunningham, Ian H. White

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

Layered asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with high spectral efficiency is proposed in this paper for optical wireless transmission employing intensity modulation with direct detection. In contrast to the conventional ACOOFDM, which only utilizes odd subcarriers for modulation, leading to an obvious spectral efficiency loss, in layered ACO-OFDM, the subcarriers are divided into different layers and modulated by different kinds of ACO-OFDM, which are combined for simultaneous transmission. In this way, more subcarriers are used for data transmission and the spectral efficiency is improved. An iterative receiver is also proposed for layered ACO-OFDM, where the negative clipping distortion of each layer is subtracted once it is detected so that the signals from different layers can be recovered. Theoretical analysis shows that the proposed scheme can improve the spectral efficiency by up to 2 times compared with conventional ACO-OFDM approaches with the same modulation order. Meanwhile, simulation results confirm a considerable signal-to-noise ratio gain over ACO-OFDM at the same spectral efficiency.

Original languageEnglish
Pages (from-to)12382-12393
Number of pages12
JournalOptics Express
Volume23
Issue number9
Early online date1 May 2015
DOIs
Publication statusPublished - 4 May 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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