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Proceedings Paper

Robust free-space optical communication for indoor information environment
Author(s): Toyohisa Nakada; Hideo Itoh; Susumu Kunifuji; Hideyuki Nakashima
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Paper Abstract

The purpose of our study is to establish a robust communication, while keeping security and privacy, between a handheld communicator and the surrounding information environment. From the viewpoint of low power consumption, we have been developing a reflectivity modulating communication module composed of a liquid crystal light modulator and a corner-reflecting mirror sheet. We installed a corner-reflecting sheet instead of light scattering sheet in a handheld videogame machine with a display screen with a reflection-type liquid crystal. Infrared (IR) LED illuminator attached next to the IR camera of a base station illuminates all the room, and the terminal send their data to the base station by switching ON and OFF of the reflected IR beam. Intensity of reflected light differs with the position and the direction of the terminal, and sometimes the intensity of OFF signal at a certain condition is brighter than that of ON signal at another condition. To improve the communication quality, use of machine learning technique is a possibility of the solution. In this paper, we compare various machine learning techniques for the purpose of free space optical communication, and propose a new algorithm that improves the robustness of the data link. Evaluation using an actual free-space communication system is also described.

Paper Details

Date Published: 30 September 2003
PDF: 12 pages
Proc. SPIE 5264, Optomechatronic Systems IV, (30 September 2003); doi: 10.1117/12.515012
Show Author Affiliations
Toyohisa Nakada, Japan Advanced Institute of Science and Technology (Japan)
Hideo Itoh, Japan Advanced Institute of Science and Technology (Japan)
National Institute of Advanced Industrial Science and Technology (Japan)
CREST, Japan Science and Technology Corp. (Japan)
Susumu Kunifuji, Japan Advanced Institute of Science and Technology (Japan)
Hideyuki Nakashima, Japan Advanced Institute of Science and Technology (Japan)
National Institute of Advanced Industrial Science and Technology (Japan)
CREST, Japan Science and Technology Corp. (Japan)


Published in SPIE Proceedings Vol. 5264:
Optomechatronic Systems IV
George K. Knopf, Editor(s)

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