Visible light transmitter, visible light receiver, visible light communication system, and visible light communication method

摘要

A visible light communication system having a transmission apparatus for modulating a transmission signal to a multiple-value number and a reception apparatus for demodulating a multiple-value modulated transmission signal is provided. The transmission apparatus includes a plurality of light emitters for emitting light in different colors, a chromaticity coordinates calculator for mapping a digital value to a chromaticity coordinates value, and a light intensity controller for controlling a light intensity of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value. The reception apparatus includes a plurality of light receivers having different spectral characteristics, a chromaticity coordinates calculator for calculating a chromaticity coordinates value according to a received light intensity detected by each of the light receivers, and a demodulator for demodulating the digital value from the chromaticity coordinates value.

主权项

1. A visible light communication system, the system comprising:
a transmission apparatus configured to transmit a visible light communication, the transmission apparatus comprising:
a plurality of light emitters configured to emit light in different colors;a first controller configured to determine a chromaticity coordinates value corresponding to a digital value of transmission data based on a predetermined multiplicity map defining the chromaticity coordinates value versus the digital value of the transmission data; to determine a light intensity ratio of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value of the transmission data; and to control a light intensity of each of the light emitters based on the determined light intensity ratio; and a reception apparatus configured to receive the visible light communication, the reception apparatus comprising:
a plurality of light receivers having different spectral characteristics;a second controller configured to calculate a chromaticity coordinates value according to a ratio of received light intensity detected by each of the light receivers; and to demodulate the digital value of the transmission data based on the predetermined multiplicity map.