Modulation and Demodulation MATLAB Code with Comprehensive Implementation

This comprehensive MATLAB code collection provides complete implementations for various modulation and demodulation techniques including AM, FM, FSK, GFSK, MSK, and GMSK. The implementations feature voice signal testing capabilities specifically for AM and FM modulations. Each program includes detailed code explanations with comments describing key functions and implementation steps, thorough theoretical analysis of modulation principles, and comprehensive performance comparison studies analyzing bandwidth efficiency, bit error rates, and signal quality metrics. The codebase employs MATLAB's Signal Processing Toolbox functions for waveform generation, filter design, and spectral analysis. Key implementation aspects include carrier wave generation using trigonometric functions, modulation index calculations, frequency deviation parameters for FM, and Gaussian filter implementations for GFSK/GMSK. The voice testing modules incorporate audio file processing and real-time signal analysis capabilities. We hope this resource proves valuable for understanding digital communication systems, implementing modulation schemes, and conducting performance evaluations in wireless communication research and education.