Patent ID: 8565607

Claim:
A visible light multiplex communication system that performs communication between a server, a plurality of tag clients and a plurality of data clients by using visible light signals, the system comprising: an access point (AP) connected to the server via a network, transmitting visible light signals to each of the tag and data clients and receiving and detecting visible light signals from each of the tag and data clients, wherein the AP comprises: an AP transmitting unit transmitting visible light signals to the tag clients and the data clients, wherein the AP transmitting unit comprises: a plurality of AP modulators modulating ID information for the tag clients and data information for the data clients such that at least one of the AP modulators modulating electrical signals that correspond to ID information for the tag clients, and at least another one of the AP modulators modulating electrical signals that correspond to data information for the data clients; an AP multiplexer converting the modulated ID information and data information into integrated signals; and an AP light-emitting unit converting the integrated signals from the AP multiplexer into visible light signals; and an AP receiving unit receiving visible light signals from the tag clients and the data clients, wherein the AP receiving unit comprises: an AP light-receiving unit detecting and converting visible light signals transmitted from the tag clients and the data clients into electrical signals; an AP demultiplexer splitting electrical signals that respectively correspond to the tag and data clients; a plurality of AP demodulators demodulating split electrical signals such that at least one of the AP demodulators demodulating split electrical signals into ID information for the tag clients, and at least another one of the AP demodulators demodulating split electrical signals into data information for the data clients; the tag clients transmitting and receiving their own identification (ID) information to and from the AP by using visible light signals; and the data clients transmitting and receiving data information comprising at least one among a voice, an image, and a text to and from the AP by using visible light signals wherein each data client comprises: a data receiving unit comprising: a data light-receiving unit detecting and converting visible light signals transmitted from the AP into electrical signals, a data demultiplexer extracting electrical signals that correspond to each respective data client, and a data demodulator demodulating electrical signals from the data demultiplexer; and a data transmitting unit comprising: a data modulator modulating data information for each respective data client, and a data light-emitting unit converting and transmitting the modulated data information into visible light signals to the server.