BPSK, QPSK, and 8PSK Modulation Simulation with Extensible Design

This program implements modulation simulations for BPSK, QPSK, and 8PSK schemes, featuring an extensible architecture that readily accommodates other modulation techniques like MPSK and MQAM. The codebase is organized into three modular components. The first module, phase.m, performs pulse shaping on baseband symbol sequences through configurable pulse types including rectangular, raised cosine, and square-root raised cosine pulses, implementing key digital communication filtering techniques. The core functionality resides in model.m, which acts as the main program responsible for constellation mapping (converting bits to complex symbols), pulse shaping (using convolution with shaping filters), and carrier modulation (multiplying with complex exponentials). Finally, command.m provides spectral analysis capabilities through FFT-based frequency domain visualization, enabling users to observe power spectral density and bandwidth characteristics. By utilizing this simulation framework, researchers can thoroughly investigate the performance characteristics and trade-offs of BPSK, QPSK, and 8PSK modulation schemes. The modular design facilitates straightforward extension to higher-order modulations, supporting comprehensive digital communication system experiments. The code employs MATLAB's signal processing toolbox for efficient filter implementation and constellation visualization, making it particularly suitable for educational demonstrations and research prototyping. We hope this program proves valuable for your communication systems research and learning endeavors!