MATLAB Simulation of BPSK Modulation with Demodulation Techniques

This MATLAB simulation implements Binary Phase Shift Keying (BPSK) modulation and employs both coherent detection and differentially coherent detection methods for signal demodulation. The implementation includes generation of random binary data, BPSK modulation using phase shifting (0° for bit '0' and 180° for bit '1'), and adding AWGN to simulate channel conditions. For coherent detection, the receiver uses a correlator or matched filter with a locally generated carrier reference synchronized to the transmitter's phase. Differentially coherent detection employs differential encoding/decoding where phase changes between consecutive symbols determine the bit values. Key functions used include rand() for data generation, cos() for carrier waveform, and awgn() for noise addition. The simulation calculates bit error rate by comparing transmitted and received bits using logical operations, providing quantitative performance assessment of the communication system under different signal-to-noise ratio conditions.