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In this paper, we will review our recent works on advanced signal processing for VLC, particularly the orthogonal circulant matrix transform (OCT) precoding that requires no channel state information. The benefits of OCT precoding in SISO-, MIMO-VLC, and the inherent reason of performance improvement, will be discussed. In addition, comparisons of the existing solutions to combat the limited modulation...
An orthogonal circulant matrix transform (OCT) precoding scheme is proposed for indoor visible light communications. We show the proposed scheme has much reduced complexity but exhibits comparable performance with adaptive bit and power loading.
In this paper, we propose a MIMO-OFDM indoor VLC system with orthogonal circulant matrix transform (OCT) precoding and angular receivers to significantly improve the achievable aggregate capacity of equivalent parallel channels. Compared with the conventional MIMO-OFDM based VLC systems, the data streams of LED transmitters in our proposed system are linearly pre-processed with the OCT precoding scheme...
In this letter, we propose an adaptive indoor multiple input and multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication (VLC) system using a receiver module with angular diversity. In order to improve the capacity of indoor MIMO-OFDM VLC systems, tilted receivers are utilized to increase channel diversity, thus reducing channel correlation. With the help...
Multiple input and multiple output (MIMO) technique offers advantage of high data rate parallel transmission for indoor visible light communication (VLC) systems. As multiple decentralized user terminals are generally employed in typical indoor environment, the main difficulty for multi-user MIMO indoor VLC systems lies in the separation of data for different user terminals. We have proposed a linear...
Visible light communication has aroused many research interests in recent years. Given the limited modulation bandwidth of LED, multiple input and multiple output (MIMO) technology appears attractive in VLC systems as multiple LED sources are typically employed in indoor environment to supply sufficient illuminance. For a practical indoor system, there generally exist multiple decentralized user terminals,...
Indoor visible light communication using MIMO-OFDM transmission is basically expected to be deployed along with the coming next generation solid-state lighting based on white light-emitting diodes. This paper first shows our recent proposed indoor MIMO-VLC system for multiuser application scenario. By utilizing a precoding scheme in the transmitter, an asymmetric system configuration can be setup...
Multiple input multiple output (MIMO) technology appears attractive for indoor visible light communication (VLC) systems as multiple light-emitting diodes (LED) sources are typically deployed for indoor environment. Most of current indoor MIMO VLC systems utilize single user terminal scenario to investigate the performance of the system. However, typical arrangement of a practical indoor environment...
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