| Autor: |
Alisa Kawade, Wataru Chujo, Kentaro Kobayashi |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
IEEE Photonics Journal, Vol 16, Iss 3, Pp 1-12 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1943-0655 |
| DOI: |
10.1109/JPHOT.2024.3400877 |
| Popis: |
In uplink screen camera communication from a smartphone screen to an indoor telephoto camera at a distance of 3.5 meters, low-luminance space division multiplexing screen is used to increase bitrate and enhance physical layer security (PLS) at wide angles. Since the low-luminance pixels on the screen are affected by ambient light, it is difficult to determine each cell symbol correctly using pre-trained pixel value threshold. To make symbol decisions without threshold learning, symbol decisions based on correlation of spatial 4 pulse position modulation (4PPM) pattern are demonstrated with numerical models and experiments. To increase bitrate further, threshold-free symbol decision methods combining 4PPM and inverted 4PPM cells are demonstrated. In addition, to enhance PLS at wide angles while maintaining error-free transmission in the front direction, threshold-free symbol decision methods are analyzed and experimentally verified at wide angles. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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