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We have proposed a novel hybrid software and hardware equalization scheme based on digital zero-padding pre-equalization and differential reception. We have experimental demonstrated a red LED based visible light communication system over 1-meter free space transmission with the measured BER below 7% FEC threshold. The signal is QAM-DMT modulated and the modulation level is varying from 32QAM to 128QAM...
This paper investigates the performance of underwater visible light communications (UVLC) systems employing multiple transmitters and/or multiple receivers to exploit the advantage of spatial diversity. Experimental results are further provided to evaluate the error performance of single input multiple outputs (SIMO), multiple inputs single output (MISO) and multiple inputs multiple outputs (MIMO)...
We propose a power efficient multiple access scheme for visible light communications (VLC) based on the block interleaved frequency division multiple access (B-IFDMA), which provides large frequency-diversity, flexible bandwidth allocation, low complexity of channel equalization and user separation. The impact of the number of subcarrier per block on the transmission performance under wireless optical...
We researched the performance of the aspheric lens as the receiving antenna of the indoor Visible Light Communication and got the different results with the lens placed in different situations. We use channel gain curves to describe the relationship between the Field-of-View and the optical gain of the receiving antenna. The experiment shows that the aspheric lens can provide a 15dB optical gain and...
We experimentally demonstrate an indoor visible light positioning system based on optical camera communications, in which the transmitted coordinate data are spatially separated and demodulated by a camera. The receiver's position is calculated based on the coordinates of light-emitting diodes in the real word and in the image.
We investigate and analyze the asymmetrically clipped and direct-current-biased optical orthogonal frequency division multiplexing (ADO-OFDM) in visible light communication (VLC) system. Then we propose two modified channel equalization algorithms of ADO-OFDM in VLC systems. It is shown that the algorithm combined with channel estimation for interference cancellation to recover ADO-OFDM signal is...
Visible light communication has drawn much attention due to the extensive use of light emitting diodes (LED). For ultra-dense small cell deployment, visible light communication has to define the position of users for providing services and switch policies, and deal with the superposition of the light. In this paper, we propose an indoor intelligent visible light system based on Triple-Domain-Cooperation...
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,...
The Visible Light Communication (VLC) is a good candidate technology for the application of Intelligent Transportation System (ITS). This paper focuses on typical application scenario between the traffic lights and lorry fleet. Based on the theoretical analysis and numerical calculation, we get the relationship between the speed of the lorry fleet and the conversion time of the traffic lights. The...
In this paper, we present a novel channel model for indoor visible light communication (VLC) system with specular reflection. In contrast to the previous indoor visible light communication simulation models, our model is not restricted to diffuse reflection, with specular reflection considered. The simulation environment is set up in MATLAB and our model is capable of obtaining several channel characteristics...
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