Patent ID: 9054799
Filing Date: 2015-06-09
Classification: H04B

Abstract:
1. A wireless light communication method using a plurality of light transmitting units driven by a same alternating current (AC) power, and a light receiving unit for receiving optical signals transmitted by the plurality of light transmitting units, the wireless light communication method comprising: determining a plurality of light transmitting units have optical signals with an overlapping area; setting a channel for each of the plurality of light transmitting units such that light transmitting units having the overlapping area that is reachable by the optical signals use different channels; detecting zero crossing of the AC power; synchronizing channels by using the detected zero crossing, and transmitting an optical signal through the set channel by using the plurality of light transmitting units; and receiving the optical signal transmitted by each of the plurality of light transmitting units by using the light receiving unit, and analyzing information included in the received optical signal, wherein the channel is in a time domain, and different time slots are assigned to each channel.