NDLI: Multiuser MIMO-OFDM for Visible Light Communications

Content Provider	IEEE Xplore Digital Library
Author	Qi Wang Zhaocheng Wang Linglong Dai
Copyright Year	2009
Abstract	Visible light communication (VLC) is emerging as a promising technique to provide ubiquitous wireless connection. In this paper, a multiuser VLC system utilizing multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) is investigated. Since the distances of the multiple transmitter-receiver links are different, their temporal delays are also different, resulting in complex channel gain and phase differences when transformed to the frequency domain. For each subcarrier in OFDM, the corresponding precoding matrix is calculated in the frequency domain to eliminate multiuser interference. Phase information in the frequency domain is first considered, where complex, instead of real, channel matrices are used for precoding, which reduces the channel correlation and achieves better performance. Moreover, minimum dc bias, unified dc bias, and asymmetrically clipped optical OFDM-based schemes are proposed to generate real-valued nonnegative signals for intensity modulation, and their performances are validated via simulations with zero forcing and minimum mean-squared error (MMSE) precoding techniques.
Starting Page	1
Ending Page	11
Page Count	11
File Size	746044
File Format	PDF
ISSN	19430655
Volume Number	7
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes OFDM Interference Receivers Frequency-domain analysis Visible light communication Optical transmitters precoding multiple-input multiple-output orthogonal frequency-division multiplexing multiuser Visible light communication (VLC) multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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