Simulation and Implementation of Amplitude-Shift Keying Modulation in Digital Communication Systems: A Practical Approach

Abstract

Advancements in wireless communication systems have positioned digital communication as a fundamental technology. Among the array of digital modulation methods, Amplitude Shift Keying (ASK) holds a significant position. This study centrally involves the simulation of the ASK modulation scheme using MATLAB software, accentuating practicality in design and execution. Notably, the correlation between simulated results and practical implications stands as a noteworthy achievement. The investigation demonstrates the conversion of a Unipolar return-to-zero square pulse message signal into a sinusoidal form, facilitating seamless transmission to the endpoint. Three key elements structure this study: the generation of the message signal, the creation of the carrier signal, and their amalgamation to generate the ASK signal. Diverse integrated circuits are employed, encompassing the utilization of a 555 timer to generate the message signal, an LM324 quad operational amplifier chip for carrier signal generation, and a CD4016 multiplexer chip for ASK signal generation. The simulated ASK system closely aligned with the practically designed setup, validating the accuracy of the theoretical model. This convergence can be attributed to meticulous considerations in circuit design and the careful selection of standard values, resulting in a compelling correlation between simulation predictions and real-world implementation. The graphical representation of the ASK signal, plotted via MATLAB, exhibited a remarkable match between theoretical and practical outputs. Furthermore, the outcomes suggest promising avenues for future exploration. One such direction involves enhancing the system's capacity by implementing an M-ray ASK system, a potential means to augment data transmission rates beyond the binary framework. Additionally, introducing randomness to the binary signal through the integration of a binary number generator emerges as a prospective area for future enhancements