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Title: Efficient MMSE-SQRD-based MIMO decoder for SEFDM-based 2.4-Gb/s-spectrum-compressed WDM VLC system
Authors: Wang, Y
Zhou, Y
Gui, T
Zhong, K
Zhou, X
Wang, L
Lau, APT 
Lu, C 
Chi, N
Keywords: MMES-OSIC
Spectrally efficient frequency division multiplexing (SEFDM)
Visible-light communication (VLC)
Issue Date: 2016
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE photonics journal, 2016, v. 8, no. 4, 7524735 How to cite?
Journal: IEEE photonics journal 
Abstract: 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.
EISSN: 1943-0655
DOI: 10.1109/JPHOT.2016.2596241
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