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Method and apparatus for communication using pulse-width-modulated visible light

  • US 20070024571A1
  • Filed: 08/01/2005
  • Published: 02/01/2007
  • Est. Priority Date: 08/01/2005
  • Status: Active Grant
First Claim
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1. A visible light communications transmitter comprising:

  • a data input providing data to the visible light communications transmitter a buffer storing data;

    a pulse generator generating a pulse;

    a signal generator providing a carrier signal;

    a modulator coupled to the pulse generator, the buffer, and the signal generator and reading data from the buffer during the pulse and modulating the carrier signal according to the data read from the buffer to produce a modulated carrier signal;

    an adder adding the modulated carrier signal to the pulse to produce a modulated pulse; and

    a pulse-width-modulated (“

    PWM”

    ) light-emitting diode (“

    LED”

    ) light source operated according to the modulated pulse so as to produce a modulated optical signal suitable for use in a visible optical communications system.

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