Free-space chaos communication using LEDs

Abstract

The synchronization of chaotic circuit is used to perform secured communication in free space through optical channel for an analogy circuit. The result shows the optimization of a security and the signal recovering ability and exams the signal restoration after going through optical channel, which composed by LED and photodiode, by using the drive and response circuit. The conditions of unsynchronization by changing parameters of the response circuit are tested. The degree of sound masking by the chaos attractor, which has a broadband of frequency, is demonstrated by looking at the RMS of the voltage, which corresponding to the sensitivity(dB/mW), of the signal and the generated chaos. Devices of the synchronization including transmitter, receiver, and equalizer are fabricated on PCB. The longest distance and angle of the optical channel of the synchronization is stated for two 2W LED.