QPSK Modulation with Costas Carrier Synchronization - MATLAB Source Code

This document provides MATLAB source code for QPSK modulation and Costas carrier synchronization, designed for educational and reference purposes in communication principles. The implementation includes key components such as QPSK signal generation with proper constellation mapping, carrier recovery using Costas loop technique with phase error detection, and synchronization mechanisms. The code demonstrates practical algorithm implementation including phase-locked loop (PLL) operation, quadrature signal processing, and error correction mechanisms. Through this code, you can study the fundamental principles and implementation methods of digital modulation and carrier synchronization, gaining insights into real-world communication system design. The implementation serves as an excellent learning resource for understanding modulation techniques, synchronization algorithms, and their practical application in MATLAB-based communication systems.