Search Results - "Chujo, Wataru"

Threshold-Free Symbol Decision Based on Spatial 4PPM Correlation for Uplink Screen Camera Communication Using Low-Luminance SDM Screen by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…In uplink screen camera communication from a smartphone screen to an indoor telephoto camera at a distance of 3.5 meters, low-luminance space division…”
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A study on modulation and diversity methods based on uniform color space for digital signage and image sensor-based VLC by Shimei, Kazuya, Kobayashi, Kentaro, Chujo, Wataru

“…We consider a visible light communication (VLC) system using a digital signage and an image sensor. In order not to impair the visual quality of the background…”
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Rolling-Shutter-Based QPSK by Spatial Luminance Distribution for Optical Camera Communication by Chujo, Wataru, Kinoshita, Masahiro

“…Multilevel phase and amplitude modulation by spatial luminance distribution of an LED lighting is proposed and experimentally investigated to increase number…”
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Spatial 4PPM Correlation with Successive Interference Cancellation for Low-Luminance WDM/SDM Screen to Camera Uplink by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…In previous study for uplink optical wireless communication from a smartphone screen to an indoor telephoto camera, low-luminance space division multiplexing…”
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Line-of-sight distance extension of rolling-shutter OCC using dual-camera spatial luminance distribution by Noma, Yamato, Chujo, Wataru

“…Rolling-shutter (RS) optical camera communication (OCC) increases the symbol rate much faster than the frame rate of the image sensor. However, transmission…”
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A study on predictive information transfer for CSMA/CA-based autonomous decentralized control by Kimura, Ryota, Kobayashi, Kentaro, Chujo, Wataru

“…This paper deals with autonomous decentralized control of mobile robots in CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)-based wireless…”
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Compensating Image Overlay QPSK Modulation by Dual Camera for Rolling Shutter-Based Screen Camera Communication by Ohtani, Hayate, Chujo, Wataru, Kobayashi, Kentaro

“…Rolling shutter (RS)-based screen camera communication (SCC) has been studied to increase data rates. Among modulation schemes for RS-based SCC, phase shit…”
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A study on indoor positioning of an open-source drone using AR markers by Okaya, Tomoki, Kobayashi, Kentaro, Chujo, Wataru

“…When drones fly autonomously, GPS is basically used to establish navigation and safety functions. However, the above functions cannot be used in non-GPS…”
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A Study on Data Signal Detection and Demodulation based on Object Detection DNN for Image Sensor-Based Visible Light Communication by Miki, Yuya, Kobayashi, Kentaro, Chujo, Wataru

“…This study focuses on a visible light communication system using a digital signage as a transmitter and an image sensor as a receiver. The transmitter…”
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A study on indoor drone positioning using Wi-Fi RTT ranging by Sugiyama, Yuichiro, Kobayashi, Kentaro, Chujo, Wataru

“…As an alternative to GPS, we focus on indoor positioning using Wi-Fi RTT, which measures the distance to a Wi-Fi access point based on the time required to…”
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Smartphone screen to camera uplink communication with enhanced physical layer security by low-luminance space division multiplexing by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…To achieve secure uplink communication from smartphones' screen to a telephoto camera at a long distance of 3.5 meters, we demonstrate that low-luminance space…”
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Low-Luminance Space Division Multiplexing With Spatial 4-PPM Correlation for Smartphone Screen to Camera Uplink Communication by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…Low-Iuminance spatial division multiplexing (SDM) with spatial 4-pulse position modulation (4-PPM) correlation is demonstrated to realize indoor uplink screen…”
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1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4 OCDM x 40 WDM x 40 Gb/s) transmission experiment using optical hard thresholding by Sotobayashi, H., Chujo, W., Kitayama, K.

“…A record of 1.6 b/s/Hz spectrum efficiency is achieved in an optical code-division-multiplexing (OCDM)/wavelength-division-multiplexing (WDM) link by…”
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Tracking an LED Transmitter by a Photodiode Receiver Using Object Detection with a Rolling Shutter Camera by Araki, Shota, Imagawa, Yudai, Uchida, Hiroto, Chujo, Wataru, Kobayashi, Kentaro

“…To realize high-throughput optical wireless communication (OWC) indoors using a photodiode (PD) receiver, the receiver that mechanically tracks an LED…”
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Enhancing Wide-Angle Physical Layer Security for Smartphone's Low-Luminance WDM/SDM Screen to Camera Uplink Communication by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…To realize indoor long-distance uplink visible light communication from a smartphone screen to a telephoto camera, wide-angle physical layer security of…”
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Increasing data rate and security by blue-pixel-value adaptive thresholding for smartphone-screen-based blue-light optical camera communication by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…To simultaneously increase data rate and security for smartphone-screen-based, space-division-multiplexing optical camera communication, blue-pixel-value…”
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Incoherent, spatial power synthesis of two continuous microwave signals generated by two different optical beats by Chujo, Wataru

“…Two continuous microwave signals generated by two different optical beats were incoherently synthesized for the enhancement of the microwave power. The…”
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Highly spectral-efficient optical code-division multiplexing transmission system by Sotobayashi, H., Chujo, W., Kitayama, K.

“…A highly spectral-efficient transmission system based on optical code-division multiplexing (OCDM) technique is investigated. To meet the rapid increase in the…”
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Smartphone-Screen-Based, Low-Luminance Uplink Optical Camera Communication by Blue-Color Adaptive Thresholding by Kawade, Alisa, Chujo, Wataru, Kobayashi, Kentaro

“…To increase data rate and security of smartphone-screen-based uplink optical camera communication, blue-color adaptive thresholding is employed for space…”
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Symbol synchronization method of image-sensor visible light communication using rolling shutter by Zinda, Takuya, Chujo, Wataru

“…High-speed, image-sensor visible light communication using rolling shutter has been studied. Symbol synchronization method by sequential estimation is applied…”
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