Koji Kamakura

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—In image sensor based VLC, transmitter acquisition and tracking are critical issue. However, the fluctuation of the VLC transmitter in the image plane caused by vehicle movement, complicates correct data reception. Therefore, in this paper, we present results of channel fluctuation measurements for infrastructure-to-vehicle VLC (I2V-VLC),(More)
This paper indicates a desired scheduler buffer size which minimizes the overall packet blocking probability of optical burst switching (OBS) networks based on forward resource reservation (FRR). A packet is blocked either if it arrives at the edge buffer that is full or if the control packet (CP) corresponding to the burst including the packet arrives to(More)
—Visible light communication (VLC) using light-emitting diodes (LEDs) is drawing much attention. There are two types of VLC reception devices, a pho-todiode and an image sensor. VLC using image sensor is called image sensor based VLC. As the receiver only uses the image sensor pixels that sense LED transmission sources and discards other pixels, including(More)
The use of two-level intensity signal for interleaved polling with adaptive cycle time (IPACT) in passive optical networks (PONs) is presented. In the scheme, two different optical powers are used by two-grouped optical network units (ONUs) for their OOK modulation formats, and combined through the passive optical coupler on the way to the optical line(More)
We focus on the road-to-vehicle visible light communication (VLC) that system is composed of a LED matrix as a transmitter and a high-speed camera as a receiver. In this VLC system, intensity of each LED cannot be determined from received image directly in case that the receiver is distant from the transmitter. In previous research, a method to estimate(More)