BPSK Modulation over AWGN Channel with Digital Communication Simulations

This MATLAB code implements a complete digital communication system simulation featuring BPSK, QPSK, and 16QAM modulation schemes over Additive White Gaussian Noise (AWGN) channels. The implementation includes full demodulation processes and comprehensive Bit Error Rate (BER) calculation methodologies. Additionally, the simulation extends to Orthogonal Frequency Division Multiplexing (OFDM) transmission scenarios to demonstrate practical wireless communication applications. Key technical components include: - Constellation mapping and demapping algorithms for different modulation schemes - AWGN channel modeling using randn() function for noise generation - BER calculation through bit-wise comparison between transmitted and received data - OFDM implementation with IFFT/FFT operations and cyclic prefix addition/removal - Modular code structure allowing independent testing of each modulation scheme The code provides practical insights into digital communication system design, including performance comparison between different modulation techniques under varying SNR conditions.