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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 |
Issue Date: | Aug-2016 | Source: | IEEE photonics journal, Aug. 2016, v. 8, no. 4, 7905709 | 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. | Keywords: | MMES-OSIC Spectrally efficient frequency division multiplexing (SEFDM) Visible-light communication (VLC) |
Publisher: | Institute of Electrical and Electronics Engineers | Journal: | IEEE photonics journal | EISSN: | 1943-0655 | DOI: | 10.1109/JPHOT.2016.2596241 | Rights: | © 2016 IEEE. IEEE Photonics Journal is open access. Articles accepted before 12 June 2019 were published under a CC BY 3.0 or the IEEE Open Access Publishing Agreement license. The following publication Y. Wang et al., "Efficient MMSE-SQRD-Based MIMO Decoder for SEFDM-Based 2.4-Gb/s-Spectrum-Compressed WDM VLC System," in IEEE Photonics Journal, vol. 8, no. 4, pp. 1-9, Aug. 2016, Art no. 7905709 is available at https://doi.org/10.1109/JPHOT.2016.2596241. |
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