• International Journal of Computer Science & Network Security
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• v.24 no.10
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• pp.53-62
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• 2024

Communication systems where chaotic signals are used as carrier signals are called Direct Chaotic Communication (DCC). DCC systems have the disadvantage of low bit-error rate (BER) and signal to noise ratio (SNR) performance. The main reason for this disadvantage is that the DCC receiver circuits are constant in the decision block with the threshold voltage values. In this study, a new receiver circuit has been designed to increase BER / SNR performance in digital based DCC systems. According to this, the noise obtained in the receiver circuits of the communication systems is accepted as the dirac delta function. Then a decision block with two inputs is performed using the dirac delta function and the ramp function is obtained. The numerical and the experimental results of the study reveal that proposed model shows much better performance between %70 and %96.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.12
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• pp.1698-1704
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• 2018

This paper presents a implementation of a chaotic Lorenz system for data secure communication applications. Here we have used PIC18F family-based microcontroller to generate the chaotic signal, and simulated waveform patterns confirm that the chaotic behavior of the microcontroller based discrete time chaotic Lorenz system. There are three R-2R ladder type A/D converters have been implemented for conversion of direct microcontroller digital output into analog waveform, utilizing this specific microcontroller relevant to this experiment work, microcontroller ports B, C and D have been utilized for its time waveform outputs X, Y and Z respectively. XC8 compiler used for the compilation of the program. MATLAB and PROTEUS software platforms are used for simulation. Finally, chaotic time wave forms, 2D chaotic attractors were obtained and secure communication analog waveforms were also verified by experimental measurement.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.482-482
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• 2006