System and method for increasing data communication bandwidth in a light communication system
OwnerSelvan Maniam, Kean Kehinventors
Life of this patent
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Abstract
In one embodiment, color sensors allow multiple data transfer channels to occur between a light source and a light detector. Light of differing wavelengths can be detected simultaneously and the modulated data on each wavelength can be independently and simultaneously processed. If desired, data from a selected wavelength can be delivered to an end-user. In another embodiment, different colors can be used for different directions of communication thereby allowing for simultaneous bi-directional communication.
Claims27
A visual light communication system comprising:
- at least one light source, said light source having a plurality of wavelengths in the visual spectrum;
- at least one modulator for placing data independently onto each said wavelength;
- at least one demodulator at one or more visual light receiving devices for recovering said data for each said wavelength;
- and
- a plurality of color sensors for separating wavelengths coming to each said demodulator.
A method for visual light communication, said method comprising:
- modulating data independently onto each wavelength of a multi-wavelength visual light source, and
- demodulating said data for each said wavelength at one or more visual light receiving devices.
A communication system comprising:
- a visual display system for broadcast communicating information through the air to observers, said broadcast communication being light having wavelengths in the visual spectrum;
- a modulator for introducing data onto at least some of said wavelengths, said data on anyone wavelength being independent from data on any other wavelength;
- and
- a plurality of color sensors for separating wavelengths coming to said demodulator.
A sign comprising:
- a fixed structure comprising a plurality of different colored light sources, said light sources enabled to provide selectively controlled, visually discernable communal information;
- means from individually modulating selected colors of said colored light, said modulation placing data on said colored light;
- and
- means remote from said sign for demodulating received light so as to recover said modulated data from said light on a color of light basis.
Dependencies are inferred from the claim text.