Efficient MMSE-SQRD-Based MIMO Decoder for SEFDM-Based 2.4-Gb/s-Spectrum-Compressed WDM VLC System

Yiguang Wang; Yingjun Zhou; Tao Gui; Kangping Zhong; Xian Zhou; Liang Wang; Alan Pak Tao Lau; Chao Lu; Nan Chi

doi:10.1109/JPHOT.2016.2596241

IEEE Photonics Journal (Jan 2016)

Efficient MMSE-SQRD-Based MIMO Decoder for SEFDM-Based 2.4-Gb/s-Spectrum-Compressed WDM VLC System

Yiguang Wang,
Yingjun Zhou,
Tao Gui,
Kangping Zhong,
Xian Zhou,
Liang Wang,
Alan Pak Tao Lau,
Chao Lu,
Nan Chi

Affiliations

Yiguang Wang: ORCiD; Department of Communication Science and Engineering, and Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai, China
Yingjun Zhou: Department of Communication Science and Engineering, and Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai, China
Tao Gui: Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Kangping Zhong: Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Xian Zhou: Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Liang Wang: Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Alan Pak Tao Lau: Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Chao Lu: Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Nan Chi: Department of Communication Science and Engineering, and Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai, China

DOI: https://doi.org/10.1109/JPHOT.2016.2596241
Journal volume & issue: Vol. 8, no. 4
pp. 1 – 9

Abstract

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A spectrally efficient frequency division multiplexing (SEFDM) modulation has been proposed to improve system spectral efficiency, particularly for bandwidth-limited visible-light communication (VLC) systems. It employs non-orthogonal subcarriers to achieve bandwidth savings at the expense of serious intercarrier interference (ICI); thus, complicated detectors are required at the receiver to extract signals from the ICI. In this paper, we carry out an analysis of SEFDM modulation and establish a quasi-multiple-input multiple-output (MIMO) model for SEFDM-based systems. Based on this quasi-MIMO system model, for the first time, we propose to use an MMSE-sorted QR decomposition (MMSE-SQRD)-algorithm-based MIMO decoder to efficiently eliminate the ICI in a high-speed SEFDM-based wavelength-division multiplexing (WDM) VLC system. Using the MMSE-SQRD decoder, the WDM VLC system at an aggregate data rate of 2.4 Gb/s is experimentally demonstrated over a 2-m indoor free-space transmission, and up to 20% of bandwidth savings is achieved compared with that of the orthogonal frequency-division multiplexing (OFDM). The results clearly validate the effectiveness of the proposed MMSE-SQRD detector for SEFDM-based spectrum-compressed VLC system.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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