MATLAB Programs for Digital PLL Simulation and Digital Costas Loop Implementation

This comprehensive program suite includes MATLAB implementations for both general digital PLL simulation and digital Costas loop applications. The digital PLL simulation module is designed to evaluate digital phase-locked loop performance through systematic parameter testing. The implementation utilizes MATLAB's signal processing toolbox functions to model phase detectors, loop filters, and voltage-controlled oscillators (VCOs), allowing users to optimize parameters like loop bandwidth and damping factor for enhanced tracking performance. The digital Costas loop program serves as a robust carrier synchronization solution for digital communication systems. It employs quadrature phase detection algorithms to automatically lock onto input signals and generate synchronized outputs. Key components include I/Q demodulators, phase error calculators, and proportional-integral controllers that maintain phase coherence. Users can fine-tune parameters such as loop gain and integration constants to achieve optimal synchronization under varying signal conditions. Both programs feature an intuitive graphical user interface (GUI) built using MATLAB's App Designer, enabling users to configure simulation parameters, visualize real-time results through scope displays, and perform comparative performance analysis. The modular architecture allows for easy integration of custom signal sources and additional processing blocks, making it suitable for educational demonstrations and practical communication system development.