OFDM with QPSK Simulation: AWGN Channel and BER Analysis

This simulation implements an OFDM system with QPSK modulation, modeling transmission over an AWGN channel and performing statistical analysis of bit error rates. The implementation involves generating random binary data streams, mapping them to QPSK symbols, and applying OFDM modulation through IFFT operations with cyclic prefix insertion. The receiver chain performs synchronized OFDM demodulation using FFT, followed by QPSK symbol demapping and BER calculation. The simulation incorporates AWGN injection with configurable SNR levels to emulate real-world channel conditions. By analyzing the statistical results across varying SNR values, we can evaluate the system's reliability and performance characteristics, including spectral efficiency and noise resilience. The code structure includes modular functions for constellation mapping, pilot insertion, channel equalization, and error counting to facilitate comprehensive performance assessment.