Simulation of QPSK Modulation Process

This program implements a comprehensive simulation of QPSK (Quadrature Phase Shift Keying) modulation using MATLAB. The implementation includes constellation mapping algorithms where input bits are grouped into symbol pairs and mapped to complex constellation points. The simulation generates both time-domain modulation waveforms and frequency-domain spectral characteristics using FFT-based analysis. Key performance metrics such as Bit Error Rate (BER) and Symbol Error Rate (SER) are calculated through Monte Carlo simulations under various channel conditions. The program incorporates channel modeling with Additive White Gaussian Noise (AWGN) and implements coherent demodulation algorithms with proper phase recovery mechanisms. Performance analysis across different Signal-to-Noise Ratio (SNR) conditions is systematically evaluated, providing insights into QPSK's robustness and limitations. Through this simulation, users can gain deep understanding of QPSK modulation principles, performance characteristics, and practical implementation techniques using MATLAB's communication toolbox functions. This program serves as an educational tool for understanding digital modulation techniques and their practical applications in communication systems.