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IEICE TRANSACTIONS on Fundamentals

Space Division Multiplexing Using High-Luminance Cell-Size Reduction Arrangement for Low-Luminance Smartphone Screen to Camera Uplink Communication

Alisa KAWADE, Wataru CHUJO, Kentaro KOBAYASHI

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Summary :

To simultaneously enhance data rate and physical layer security (PLS) for low-luminance smartphone screen to camera uplink communication, space division multiplexing using high-luminance cell-size reduction arrangement is numerically analyzed and experimentally verified. The uplink consists of a low-luminance smartphone screen and an indoor telephoto camera at a long distance of 3.5 meters. The high-luminance cell-size reduction arrangement avoids the influence of spatial inter-symbol interference (ISI) and ambient light to obtain a stable low-luminance screen. To reduce the screen luminance without decreasing the screen pixel value, the arrangement reduces only the high-luminance cell area while keeping the cell spacing. In this study, two technical issues related to high-luminance cell-size reduction arrangement are solved. First, a numerical analysis and experimental results show that the high-luminance cell-size reduction arrangement is more effective in reducing the spatial ISI at low luminance than the conventional low-luminance cell arrangement. Second, in view point of PLS enhancement at wide angles, symbol error rate should be low in front of the screen and high at wide angles. A numerical analysis and experimental results show that the high-luminance cell-size reduction arrangement is more suitable for enhancing PLS at wide angles than the conventional low-luminance cell arrangement.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E106-A No.5 pp.793-802
Publication Date
2023/05/01
Publicized
2022/11/01
Online ISSN
1745-1337
DOI
10.1587/transfun.2022WBP0004
Type of Manuscript
Special Section PAPER (Special Section on Intelligent Transport Systems and Wideband Systems)
Category

Authors

Alisa KAWADE
  Meijo University
Wataru CHUJO
  Meijo University
Kentaro KOBAYASHI
  Meijo University

Keyword