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Phase modulation is used in DCO-OFDM for visible light communications, whereby around 10 dB PAPR reduction is achieved. Considering the nonlinearity of LED emitters, our proposed method achieves better BER performance than that of conventional DCO-OFDM.
We demonstrate that DCTs-OFDM has the similar BER performance with traditional OFDM in VLC, while effectively improves the transmission distance by 20% due to less PAPR and SNR-BER performance about 1dB in multipath interference environment.
We consider the visible light communication in extremely weak illumination environment. The system consists of an LED transmitter and a photomultiplier tube (PMT) receiver. We also show the bit-error rate (BER) of the signal detection.
In this paper, a novel undersampled pulse amplitude modulation with subcarrier modulation (UPAMSM) is proposed to supporting high efficiency non-flickering visible light camera communication (CamCom). A post-compensation technique is employed to reduce nonlinear effects caused by camera gamma correction. In order to eliminate phase uncertainty between transmitter and camera, and obtain the built-in...
We propose a power-efficient high-dimensional constellation design scheme leveraging color and frequency diversities for intensity modulation and direct detection optical wireless systems. Simulation results are provided where notable power gains are obtained because of compact sphere-packing.
We propose a non-imaging MIMO-OFDM based VLC, and analyzed its bit-error-rate (BER) performance for different LED arrangements. Rectangular LED arrangement offers improved BER compared to the linear arrangement for a range of higher-order modulation schemes.
This invited paper focuses on a high-speed image sensor as a visible light communication (VLC) reception device to develop the intelligent transport systems (ITS) application using VLC technique. We refer to the VLC using a high-speed image sensor as image-sensor-based VLC. A major advantage of the image sensor is the ability to spatially separate multiple sources. Based on this ability, we proposed...
This paper provides an overview of state-of-art photonic technologies for Analog-to-Digital converters (ADCs). Technologies discussed include: silicon electro-optic modulator, monolithic construction of photonics/electronics processing devices used in analog-to-digital conversion, and applications of it to ADCs.
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