To meet illumination requirement, a static perceived color is required and the signals used to modulate the multi-color LEDs should follow color constraints . What is more, the multi-color resources can be utilized to improve the transmission rate via wavelength-division multiplexing (WDM) technology ,. Considering high rendering index and tunable correlated color temperature (CCT), multi-color LEDs (e.g., RGB LED and quadrichromatic LED (QLED)) show remarkable advantages over P-LEDs . VLC technology provides a new method of short-range wireless communication with new spectrum resources, which has been accepted as a key technique of 5G wireless communication networks .įor VLC system, there are two typical types of LED luminaries, which are respectively equipped with phosphor-based LEDs (P-LEDs) and multi-color LEDs . With the help of the light-emitting diodes (LEDs), communication and lighting can be combined via visible light communication (VLC) technology ,,. In order to analyze the performance of the JC design, conventional TDMA and non-orthogonal multiple access (NOMA) scheme are introduced as comparisons and the simulation results illustrate that JC owns a better performance than both of them. Afterwards, a method of constellation mapping for the system is provided. To make it easy to solve the non-convex optimization problem, we propose an iterative algorithm with the help of slack variable and Taylor expansion. Considering the signal constraints in both optical and electric domains, the JC design is formulated with the objective function of maximizing the minimum Euclidean distance (MED) between different receiving constellation points. Unlike traditional multiple-input–multiple-output (MIMO) researches in which the symbols of different transmitters are independently generated from the constellations, the transmitted symbols are jointly generated in our design which takes the advantage of both multi-color and spacial resources in VLC systems. To achieve a more efficient multi-user communication, we propose a multi-user joint constellation (JC) design for color-shift keying (CSK) by utilizing multiple LED luminaries equipped with multi-color LEDs. Consequently, multiple access technique, e.g., time division multiple address (TDMA), is required to enable multiple users to share the network without interfering each other. Under normal conditions, there is more than one user who needs to be connected to the VLC network. See also for a list of several various 3rd party "video joining" utilities.While creating a required illumination, LED luminaries can be used as wireless access points by visible light communication (VLC) technology. Overall, none of the ways VLC offers to combine streams appears to merge them with correct time signatures even when replayed in VLC (causing seeking errors), so a non VLC option might work better. To do any of this in "non interactive" mode, add -I dummy and also "vlc://quit" to the end of your list of inputs. > "%PROGRAMFILES%\VideoLAN\VLC\vlc.exe" go.ps.1 go.ps.2 go.ps.3 vlc://quit -no-sout-all -sout-file-append -sout=file/ps:go.ps Non Interactive Mode > "%PROGRAMFILES%\VideoLAN\VLC\vlc.exe" file1.ps file2.ps file3.ps -sout "# gather:std If you have more than one source files that need to be merged into a single output file, the general way is this (no transcoding is necessary if all streams match): #Allow multiple vlc how toThis page describes how to merge and transcode multiple videos with a script.
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