A modified VPPM algorithm of VLC systems suitable for fast dimming environment
| Autor: | Seungwoo Lee, Youngil Park, Byung-gu Ahn, MinChul Ju |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Brightness business.industry Testbed ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Visible light communication 020206 networking & telecommunications 02 engineering and technology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 020210 optoelectronics & photonics Optics Transmission (telecommunications) Moving average Pulse-position modulation 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry business |
| Zdroj: | Optics Communications. 365:43-48 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2015.11.065 |
| Popis: | As LED applications with fast dimming appears, it is required that the variable pulse position modulation (VPPM)-based visible light communications (VLC) scheme works in this environment also. With the previous VPPM scheme, however, transmission was made possible only in different dimming levels, not in the transition period. In this work, we propose a novel VPPM scheme to operate even in rapid brightness fluctuation environment. For this purpose, we adopt a stepwise brightness change at the LED and moving average correlation masks to cope with the changing brightness. The implemented VLC testbed demonstrates that the proposed scheme is appropriate for fast dimming environment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect