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Multiuser MIMO-OFDM for visible light communications

Multiuser MIMO-OFDM for visible light communications
Multiuser MIMO-OFDM for visible light communications
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.
1943-0655
1-11
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d

Wang, Qi, Wang, Zhaocheng and Dai, Linglong (2015) Multiuser MIMO-OFDM for visible light communications. IEEE Photonics Journal, 7 (6), 1-11. (doi:10.1109/JPHOT.2015.2497224).

Record type: Article

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.

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Accepted/In Press date: 29 October 2015
e-pub ahead of print date: 2 November 2015
Published date: 1 December 2015
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 400615
URI: https://eprints.soton.ac.uk/id/eprint/400615
ISSN: 1943-0655
PURE UUID: fc6ae3b7-3375-48e1-98b0-4b527da34df5

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Date deposited: 19 Sep 2016 15:47
Last modified: 17 Jul 2017 18:11

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