MATLAB Code Implementation for Phase-Locked Loop Simulation

This program implements a phase-locked loop simulation that achieves carrier synchronization at the receiver side. The code contains detailed comments and adheres to standard programming conventions. At the transmitter, users can select from three modulation schemes: single-carrier modulation, BPSK modulation, and QPSK modulation. The simulation generates constellation diagrams to visualize signal points, plots showing frequency and phase errors in the PLL operation, and demodulated baseband waveforms for output analysis. From an implementation perspective, the code likely includes key components such as: - Phase detector algorithms for error calculation - Loop filter implementations (proportional-integral controllers) - Voltage-controlled oscillator (VCO) modeling - Constellation mapping/demapping functions for different modulation schemes - Error measurement and plotting routines The program can be further extended by adding more modulation options (such as 8-PSK or 16-QAM), incorporating additional debugging features, and implementing performance comparison capabilities between different modulation schemes. These enhancements would make the simulation more comprehensive and powerful for analyzing communication system performance under various conditions.