Simulation Implementation of Binary DPSK Modulation and Coherent Demodulation Process

This implementation provides a MATLAB-based simulation of Binary Differential Phase Shift Keying (DPSK) modulation and coherent demodulation processes. The code includes complete annotations that explain key communication theory concepts such as carrier signal generation, phase difference encoding, and coherent detection mechanisms. The modulation section demonstrates how to implement DPSK by encoding binary data through phase differences between consecutive symbols, avoiding the need for absolute phase reference. The coherent demodulation part shows carrier recovery techniques and phase comparison algorithms for signal decoding. Key functions include waveform generation, symbol mapping, and bit error rate calculation modules. The simulation allows students to visualize signal constellations, analyze eye diagrams, and measure system performance under different noise conditions. Practical implementation details cover sampling rate considerations, filter design for pulse shaping, and synchronization methods for proper demodulation. This hands-on approach helps bridge theoretical concepts with real-world digital communication system design.