A Study of Shadowing on Indoor Visible-Light Wireless Communication Utilizing Plural White LED Lightings

Authors:
Toshihiko Komine;Shinichiro Haruyama;Masao Nakagawa
Affiliations:
Department of Information and Computer Science, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, Japan 223-8522;Department of Information and Computer Science, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, Japan 223-8522;Department of Information and Computer Science, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, Japan 223-8522
Venue:
Wireless Personal Communications: An International Journal
Year:
2005

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Abstract

White LED is considered as a strong candidate for the future lighting technology. We have proposed an optical wireless communication system that employs white LEDs for indoor wireless networks. In this system, LED is used not only as a lighting device, but also as a communication device. The transmitter has large optical power and large emission characteristics to function as lighting device. And the system has specific wireless channel impulse response differing from infrared wireless communication. In this paper, we discuss about shadowing effect on the system utilizing plural LED lightings including the performance of ISI based on the impulse response. We consider the downlink transmission based on TDMA and evaluate the shadowing effect caused by pedestrians with computer simulation. When the shadowing often occurs at 800 Mb/s, the performance of outage call duration rate and blocking rate are improved by using 3 LED lightings compared with 1 or 2 LED lightings. And, we show that the system with the optimal number of the LED lighting is robust against shadowing and can accommodate more calls.