Optical-Wireless VN-CSK Communication-Based Indoor Positioning System
2019 年 23 巻 4 号 p. 167-171
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2019 年 23 巻 4 号 p. 167-171
Indoor visible-light communications using lighting devices is attracting attention. Using a communication function, a lighting function and a positioning function simultaneously is expected to upgrade the previous optical wireless system. We previously proposed the variable N-parallel code shift keying (VN-CSK) system with a positioning function. Triangulation location scheme using pseudonoise (PN) codes was proposed for the VN-CSK system. In this paper, a VN-CSK communication-based optical fingerprint scheme is proposed. The most suitable placement pattern of LEDs in the optical fingerprint scheme differs from that in the triangulation location scheme in that the optical fingerprint uses the signals received from all LEDs. The positioning accuracy of the optical fingerprint scheme is the same as that of the triangulation location scheme.
