2DPSK Modulation and Demodulation MATLAB Program

This MATLAB program implements 2DPSK (2-ary Differential Phase Shift Keying) modulation and demodulation with complete verification of its functionality. 2DPSK is a widely used digital modulation technique in wireless communication systems that transmits binary data by modifying the phase of carrier signals. The program structure includes separate functions for modulation and demodulation processes. The modulation function converts binary input data into phase-modulated signals using differential encoding to avoid phase ambiguity. Key implementation aspects include: - Carrier wave generation with configurable frequency parameters - Differential encoding algorithm that compares adjacent bits - Phase shifting mechanism (0° and 180°) for symbol representation The demodulation function processes received signals through: - Coherent detection using phase comparators - Differential decoding logic for bit recovery - Low-pass filtering and threshold decision circuits Verification tests confirm correct bit error rate performance and signal integrity throughout the modulation-demodulation chain. The program serves as a practical implementation reference for digital communication systems and includes comprehensive comments for educational purposes. This validated implementation provides valuable insights into 2DPSK system design and performance characteristics.