Method and device for visible light communication
First Claim
1. A method for visible light communication, the method comprising:
- measuring a frequency spectrum (Fspec) comprising light intensity frequencies in surrounding light;
generating a set of candidate light intensity frequencies by selecting light intensity frequencies which are unequal to frequencies, or unequal to multiples of frequencies, of the frequency spectrum, wherein each selected frequency defines a candidate light intensity frequency;
selecting from the set of candidate light intensity frequencies a first sequence of light intensity frequencies to represent a first symbol for embedding data, and selecting from the set of candidate light intensity frequencies a second sequence, different from the first, of light intensity frequencies, to represent a second symbol for embedding data; and
transmitting a light signal comprising a first time period in which a light intensity of the light signal is sequentially controlled according to the first sequence of frequencies, and comprising a second time period in which the light intensity of the light signal is sequentially controlled according to the second sequence of frequencies, thereby generating a frequency hopping light signal.
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Accused Products
Abstract
A method and device for visible light communication is disclosed. The method comprises selecting a first sequence and a second sequence of light intensity frequencies to represent a first symbol and a second symbol, respectively, for embedding data. The method comprises further transmitting a light signal. The light signal comprises time periods in which a light intensity of the light signal is sequentially controlled according to the selected sequence of light intensity frequencies. Thereby, a frequency hopping light signal is generated, in which data may be embedded. The light signal may be generated and transmitted by the device comprising a light emitter.
36 Citations
17 Claims
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1. A method for visible light communication, the method comprising:
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measuring a frequency spectrum (Fspec) comprising light intensity frequencies in surrounding light; generating a set of candidate light intensity frequencies by selecting light intensity frequencies which are unequal to frequencies, or unequal to multiples of frequencies, of the frequency spectrum, wherein each selected frequency defines a candidate light intensity frequency; selecting from the set of candidate light intensity frequencies a first sequence of light intensity frequencies to represent a first symbol for embedding data, and selecting from the set of candidate light intensity frequencies a second sequence, different from the first, of light intensity frequencies, to represent a second symbol for embedding data; and transmitting a light signal comprising a first time period in which a light intensity of the light signal is sequentially controlled according to the first sequence of frequencies, and comprising a second time period in which the light intensity of the light signal is sequentially controlled according to the second sequence of frequencies, thereby generating a frequency hopping light signal. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 13, 16, 17)
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7-10. -10. (canceled)
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14. A light transmitter device for visible light communication, the device comprising:
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a sensor for measuring a frequency spectrum comprising light intensity frequencies in surrounding light; a candidate light intensity frequency generator for generating a set of candidate light intensity frequencies by selecting light intensity frequencies which are unequal to frequencies, or unequal to multiples of frequencies, of the frequency spectrum, wherein each selected frequency defines a candidate light intensity frequency; a frequency sequence selector for selecting from the set of candidate light intensity frequencies a first sequence of light intensity frequencies to represent a first symbol for embedding data, and for selecting from the set of candidate light intensity frequencies a second sequence, different from the first, of light intensity frequencies, to represent a second symbol for embedding data; and a light emitter arranged for emitting a light signal comprising a first time period in which a light intensity of the light signal is sequentially controlled according to the first sequence of frequencies, and comprising a second time period in which the light intensity of the light signal is sequentially controlled according to the second sequence of frequencies, thereby generating a frequency hopping light signal. - View Dependent Claims (15)
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Specification