VISIBLE-LIGHT COMMUNICATIONS SYSTEM AND METHOD

摘要

The present invention provides a visible-light communications system allowing high quality, high-speed communications. More specifically, the visible-light communications system comprises a transmission device which: has a plurality of light-emitting units for emitting light of different colours; makes transmission data correspond to chromaticity points on chromaticity coordinates; calculates the amount of light emitted from each of the light-emitting units in such a way that  coloured light of chromaticity points corresponding to the transmission data is sent out; generates a preamble signal used in a channel matrix estimation; and makes each of the light-emitting units emit light on the basis of the preamble signal and the calculated amount of emitted light. Additionally, the visible-light communications system also comprises a receiving device which: has a plurality of light-receiving units for receiving light signals of different colours; estimates the channel matrix on the basis of the light signals corresponding to the preamble signal, when such light signals are received by the various light-receiving units; uses radio waves to carry out compensation on the light signal corresponding to the chromaticity point on the basis of the estimated channel matrix; and demodulates the transmission data by detecting the chromaticity points on the chromaticity coordinates on the basis of the signal after the radio-wave compensation.