MATLAB-based QPSK Modulation and Demodulation Simulation

This MATLAB-based simulation program demonstrates the complete QPSK modulation and demodulation process. The implementation generates modulated signals and recovers original data through demodulation, with waveform visualizations showing both transmitted and received signals. Key algorithmic components include: - Binary-to-symbol mapping using Gray coding for optimal bit error performance - Carrier modulation through cosine and sine waveform multiplication - Additive White Gaussian Noise (AWGN) channel simulation - Coherent detection with phase synchronization - Symbol-to-binary decision decoding The code contains comprehensive inline comments explaining each processing stage, including parameter configurations for symbol rate, carrier frequency, and signal-to-noise ratio adjustments. Users can modify these parameters to observe different system behaviors. The simulation serves as an educational tool for understanding digital modulation techniques, constellation diagrams, and error probability analysis in communication systems. Ideal for students and engineers seeking practical insights into QPSK implementation.