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A cooperative system for visible light positioning (VLP) and visible light communication (VLC) is proposed based on the spread-spectrum plugin of optical identification (OPID). By keeping the existing VLC frame structure untouched, two different implementation schemes were designed by adding the location information field into the communication information field for VLP applications. It is deemed...
Inter-symbol interference (ISI) in visible light communication (VLC) systems has been considered as a major problem which seriously deteriorates system performance. Constant modulus algorithm (CMA) is a widely adopted blind equalization scheme to eliminate ISI in practice due to its computational simplicity and effectiveness. This paper proposed an initialization scheme for CMA based on received signal...
We experimentally demonstrated a non-orthogonal multiple access (NOMA) scheme in combination with single carrier frequency division multiplexing (SCFDM) for visible light communications (VLC), which in principle could provide high spectral efficiency, high tolerance against multi-path and a lower peak-to-average ratio (PAPR). Compared with orthogonal frequency division multiplexing (OFDM) based NOMA,...
We propose an experimental demonstration of visible light communication (VLC) based on interleave division multiple access (IDMA), which offers low peak to average power ratio, low complexity, high robustness against multiple access interference and burst error.
The Visible Light Communication (VLC) has been shown great potential for future Intelligent Transport System (ITS) application scenario, and the infra-to-vehicle scheme is one of the most important issues in ITS applications. This paper proposes a VLC based infra-to-vehicle demo system. Based on the theoretical analysis of typical scenario, a demo system is designed and implemented.
In conventional visible light communication (VLC) dimming control systems utilizing pulse width modulation (PWM), reducing the duty cycle will push up the receiver sensitivity requirement if the transmission rate is kept constant. In this paper, we investigate a dimming control mechanism in indoor VLC to satisfy the receiver sensitivity requirement, which can achieve efficient data transmission while...
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...
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...
This paper investigates the performance of our recently proposed precoding multiuser (MU) MIMO system in indoor visible light communications (VLC). The transmitted data of decentralized users are transmitted by light-emitting-diode (LED) arrays after precoding in a transmitter, by which the MU interference is eliminated. Thus, the complexity of user terminals could be reduced, which results in the...
The arrangement with 4 LEDs positioned in the corners and 12 LEDs spread evenly on a circle makes the fluctuation of received SNR reduce to 0.85dB. The BER performance does not suffer severely from ISI, where ZF equalization only provides 0.28dB power reduction to achieve BER of 10−3 when the receiver locates in the corner.
Photovoltaic application of LED lighting has been a hot trend in residential illumination, for it integrates the advantages of both the PV systems and LED lights. However, it has a series of problems, such as high thermal loss, poor reliability, and a short life span. To address these problems, this paper presents a deep research on the whole system from a low-cost, high-efficiency and long-life point...
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