The system of intellectual lighting data transmission via visible light is developed and manufactured. Spectral characteristics of a downlink which uses the red crystal of a RGBW light emitting diode for data transfer were studied. The DALI protocol-based radiation chromaticity control system which allows us to set different lighting scenarios with constant data transmission rate was developed. The radiation chromaticity range covers almost the entire colour gamut in the colour space. The system of high-frequency matching of system component impedances was developed and frequency characteristics of the suggested scheme were studied for development of the system. Optimal parameters of the signal for visual light communication such as carrier frequency, modulation type and band were determined. Observation of the constellation diagram which represents different values of the complex amplitude of the keyed signal in the form of a complex number on a quadrature plane (cosine and sine components of the carrying signal) and of fixation of the amplitude of the error vector magnitude (EVM) was selected as a method of study of the transmission channel quality. The value of EVM in the visible light transmission channel was significantly lower for signals with amplitude modulation than for phase-manipulated signals. When implementing different lighting change scenarios, radiation of other crystals of the light emitting diode crystals not used for transmission did not lead to increase of EVM by more than one percent.
(111) substrates. The details of the growth process were analyzed. The possibilities of the quasi-closed volume method for producing high quality homogeneous layers of solid solutions were evaluated. It is shown that this method is very effective for the production of films with x < 0.1 and may be implemented at condensation temperatures up to ~ 300 o C. Studies of electrical and photovoltaic properties showed high quality of Zn x Cd 1-x Te layers and structures in general. This is, in particular, evidenced by increasing photosensitivity in the region of absorption of the film material, and of the structure as a whole, increasing integral sensitivity with zinc doping, a significant reduction in nonideality factor in solid solution films as compared with CdTe films. We have established an increase of mechanical stability of the structure with increasing Zn content, expressed in maintaining the strength during repeated thermal cycling. As a result, the manufactured Si/Zn x Cd 1-x Te heterostructures can serve as a basis for fabrication of multijunction solar energy converters.
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