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Open AccessArticle

Multiuser Transmit Precoding Design for Dimming Compatible Visible Light Communications

by Baolong Li 1,2, Xiaomei Xue 1, Qiong Wu 1,2,3, Yang Liu 1, Guilu Wu 1 and Zhengquan Li 1,*
1
Jiangsu Provincial Engineerinig Laboratory of Pattern Recognition and Computational Intelligence, Jiangnan University, Wuxi 214122, China
2
National Mobile Communication Research Laboratory, Southeast University, Nanjing 210096, China
3
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(6), 1147; https://doi.org/10.3390/app9061147
Received: 24 January 2019 / Revised: 27 February 2019 / Accepted: 12 March 2019 / Published: 18 March 2019
(This article belongs to the Special Issue Smart Lighting)
In multiuser visible light communication (VLC) systems, many transmit precoding (TPC) techniques have been investigated to suppress multiuser interference. However, these conventional works restrict their modulation to the special case of zero mean, which inherently limits their application to some popular modulations associated with the non-zero mean in VLC, such as pulse position modulation (PPM). Since the modulation with non-zero mean leads to more intricate optical power constraints and design objective functions than the case of zero mean, the TPC design that can support a general modulation is still an open problem. In the paper, we conceive of a general solution of the TPC scheme combined with dimming control for multiuser VLC systems, which is capable of mitigating multiuser interference, while at the same time, achieving the desired dimming level. The proposed scheme is applicable to a wide range of modulations in VLC, such as pulse amplitude modulation (PAM), PPM, and so on. Simulation results demonstrate that the proposed scheme outperforms the traditional pseudo-inverse-based zero-forcing TPC in terms of bit error rate (BER). View Full-Text
Keywords: light-emitting diode (LED); visible light communication (VLC); multiuser interference; transmit precoding light-emitting diode (LED); visible light communication (VLC); multiuser interference; transmit precoding
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Li, B.; Xue, X.; Wu, Q.; Liu, Y.; Wu, G.; Li, Z. Multiuser Transmit Precoding Design for Dimming Compatible Visible Light Communications. Appl. Sci. 2019, 9, 1147.

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