Patent ID: 8433203

Claim:
A visible light communication system comprising: a transmission device; and a reception device, wherein the transmission device comprises: multiple light emitting units to emit different colors of light, a luminescence controller to modulate transmission of data with a combination of each color emitted from each of the multiple light emitting units and to calculate a luminescence amount of each of the multiple light emitting units, to radiate a combined color corresponding to the combination of a corresponding colors, a preamble signal generator to generate a preamble signal using an estimation of a channel matrix, and a light emission controller to control the luminescence amount of each of the multiple light emitting units based on the generated preamble signal and to simultaneously emit signal from each of the light emitting units according to the luminescence amount calculated by the luminescence controller, and wherein the reception device comprises: multiple light receiving units to receive optical signals of different colors, a channel estimation unit to estimate the channel matrix based on a corresponding optical signal when an optical signal corresponding to the preamble signal is received by each of the light receiving units, a propagation path compensation unit to compensate the corresponding optical signal for a propagation path based on the estimated channel matrix when an optical signal corresponding to the combination of colors is received by the light receiving units, and a data demodulator to detect the combination of the colors and to demodulate the transmission data based on a signal output from the propagation path compensation unit.