Open AccessExperimental demonstration of a two-path parallel scheme for m-QAM-OFDM transmission through a turbulent-air-water channel in optical wireless communications
Author(s) -
Lu Zhang,
Han Wang,
Xu Zhao,
Fang Lu,
Xiaoming Zhao,
Xiaopeng Shao
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.006672
Subject(s) - orthogonal frequency division multiplexing , bit error rate , computer science , transmission (telecommunications) , optical wireless , quadrature amplitude modulation , optical wireless communications , electronic engineering , channel (broadcasting) , qam , visible light communication , free space optical communication , path loss , interference (communication) , telecommunications , wireless , optical communication , optics , physics , engineering , light emitting diode
In this paper, a two-path parallel scheme for m-QAM-OFDM transmission in optical wireless communications was proposed, and its principle was theoretically derived. This scheme transmitted two-path parallel OFDM signals, which carried m-QAM mapped data symbols and their conjugated data symbols respectively. Simple superimposition at the receiver was performed to mitigate the inter-carrier interference (ICI). The feasibility of the scheme was experimentally demonstrated over a turbulent-air-water channel. The results show that the proposed scheme was not sensitive to time delay between the two paths, and it brought significant improvement of bit error rates (BER) performance compared to conventional single-path m-QAM-OFDM transmission scheme even in the turbulent-air-water channel. The proposed scheme has great potential in free space optical (FSO) communications, visible light communications (VLC) and underwater optical wireless communications (UOWC).