Method and apparatus for processing signals of photo-detector in visible light communication system

A method for processing incoming signals of a plurality of photo-detectors in a visible light communication system, the method comprising the steps of:

• dividing a symbol duration to achieve a divided duration, said division being done according to an equal time interval to set the divided duration to a plurality of sequential time slots, the symbol duration being a time required to transmit one of a symbol and a bit;
• receiving in a receiver a plurality of visible light signals through a photo-detector array comprising said plurality of photo-detectors;
• determining a gain value of each photodiode of said plurality of photo-detectors during a time slot of a symbol duration, in consideration of an area of each photo-detector on the photo-detector array during the time slot and the time slot position within the symbol duration;
• multiplying a gain value of each photo-detector of said plurality of photo-detectors by an output value of a corresponding photo-detector;
• and
• summing up output values of each of the photo-detectors by which the gain value has been multiplied and calculating a total of output values of the time slot.