Abstract
In this work, we propose a novel visible light communication (VLC) scheme utilizing multiple different red green and blue triplets each with a different emission spectrum of red, green and blue for mitigating the effect of interference due to different colors using spatial multiplexing. On-off keying modulation is considered and its effect on light emission in terms of flickering, dimming and color rendering is discussed so as to demonstrate how metameric properties have been considered. At the receiver, multiple photodiodes with color filter-tuned on each transmit light emitting diode (LED) are employed. Three different detection mechanisms of color zero forcing, minimum mean square error estimation and minimum mean square error equalization are then proposed. The system performance of the proposed scheme is evaluated both with computer simulations and tests with an Arduino board implementation.
Highlights
Introduction and goalsDue to the proliferation of personal mobile devices connected to the Internet, the need of exchanging a large amount of data at very high speed has considerably increased during the last years, and this trend will continue in the future
In this work, we propose a novel visible light communication (VLC) scheme utilizing multiple different red green and blue triplets each with a different emission spectrum of red, green and blue for mitigating the effect of interference due to different colors using spatial multiplexing
In order to avoid ambiguity, we name the emission in the signalling time of a single pulse as on-off keying (OOK) symbol, while we indicate the triplet of OOK symbols emitted during Tp with RGB-OOK symbol and we call the 3Nt -ple of OOK symbols emitted by all the available light emitting diode (LED) in the signaling interval Tp as MIMO-RGB-OOK symbol
Summary
Due to the proliferation of personal mobile devices connected to the Internet, the need of exchanging a large amount of data at very high speed has considerably increased during the last years, and this trend will continue in the future. It appears that multiple-input-multiple-output (MIMO) schemes including the use of multiple colors (more than the simple single red, green and blue configuration) as a viable road for improving spectral efficiency with the goal of obtaining white light as illumination service has not been tackled both from theoretical and experimental point of view. In this context, we propose and demonstrate the possibility of using multiple RGB-LEDs (multiple triplets) for spatial multiplexing. The implementation on a Arduino board is described and tests reported in Sect. while in Sect. we draw conclusion
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