MATLAB Implementation of QPSK Simulation with BER Analysis

This simulation implements Quadrature Phase Shift Keying (QPSK) modulation and analyzes bit error rate (BER) performance under various channel conditions. The MATLAB code generates QPSK modulated signals by mapping binary data to four distinct phase states (0°, 90°, 180°, 270°), implemented using constellation mapping and I/Q component generation. The simulation incorporates additive white Gaussian noise (AWGN) channel models with different signal-to-noise ratio (SNR) values to evaluate transmission performance. BER calculation is performed by comparing transmitted and received bits using error counting algorithms and theoretical BER formulas for QPSK. Through comparative analysis of simulation results across different channel scenarios, we assess QPSK modulation's robustness and identify performance degradation patterns. The study also explores optimization techniques including channel coding implementation, pulse shaping filters (raised-cosine), and synchronization algorithms to enhance transmission efficiency and reliability. Performance metrics are visualized using MATLAB's plotting functions to display BER vs SNR curves and constellation diagrams, providing comprehensive understanding of QPSK characteristics and practical application scenarios in digital communication systems.