Communication System Simulation: QPSK Modulation and Demodulation

This article provides a comprehensive exploration of communication system simulation with emphasis on QPSK modulation and demodulation techniques. Specifically, we focus on differential demodulation methods and deliver highly valuable reference information for both MATLAB beginners and professionals working in communication simulation. Through MATLAB implementation, we can simulate communication systems and investigate QPSK modulation/demodulation processes. The content includes practical code examples demonstrating how to implement QPSK modulation using constellation mapping and differential encoding techniques. For demodulation, we cover the implementation of differential detection algorithms that compare phase differences between consecutive symbols. These materials will help readers better understand communication system fundamentals and learn how to use MATLAB for simulation and analysis tasks. Key functions discussed include waveform generation, symbol mapping, and error rate calculation. Whether you're a beginner learning MATLAB or a professional engaged in communication simulation work, this article offers valuable reference materials and guidance for your projects.