Simulation of BPSK System Transmitter

This document presents a MATLAB simulation of the transmitter section in a Binary Phase Shift Keying (BPSK) communication system. The system architecture comprises multiple key modules including digital modulation, interpolation, pulse shaping filtering, and carrier modulation. The BPSK modulation module converts binary data into phase-modulated symbols by mapping '0' to 0° phase and '1' to 180° phase, typically implemented using MATLAB's pskmod function with M=2. The interpolation module increases the sampling rate using techniques like linear interpolation or polyphase filtering to match the symbol rate to the system's required sampling frequency. The pulse shaping filter (commonly a raised cosine or root raised cosine filter) limits bandwidth while maintaining zero inter-symbol interference, implemented through MATLAB's rcosdesign function. Finally, the carrier modulation module upconverts the baseband signal to the desired carrier frequency using complex exponential multiplication, simulating the RF transmission process. These integrated modules enable comprehensive simulation of a complete BPSK transmitter chain, facilitating performance analysis and system validation through MATLAB-based experimental implementations.