Space division multiplexing using high-luminance cell-size reduction arrangement for low- luminance smartphone screen to camera uplink communication

摘要

To simultaneously enhance data rate and physical layersecurity (PLS) for low-luminance smartphone screen to camera uplinkcommunication, space division multiplexing using high-luminance cellsizereduction arrangement is numerically analyzed and experimentallyverified. The uplink consists of a low-luminance smartphone screen and anindoor telephoto camera at a long distance of 3.5 meters. The highluminancecell-size reduction arrangement avoids the influence of spatialinter-symbol interference (ISI) and ambient light to obtain a stable lowluminancescreen. To reduce the screen luminance without decreasing thescreen pixel value, the arrangement reduces only the high-luminance cellarea while keeping the cell spacing. In this study, two technical issuesrelated to high-luminance cell-size reduction arrangement are solved. First,a numerical analysis and experimental results show that the high-luminancecell-size reduction arrangement is more effective in reducing the spatial ISIat low luminance than the conventional low-luminance cell arrangement.Second, in view point of PLS enhancement at wide angles, symbol errorrate should be low in front of the screen and high at wide angles. Anumerical analysis and experimental results show that the high-luminancecell-size reduction arrangement is more suitable for enhancing PLS at wideangles than the conventional low-luminance cell arrangement.