OFDM Simulation under AWGN Channel

Simulating OFDM systems under Additive White Gaussian Noise (AWGN) channel conditions represents a fundamental practice in communication system analysis. This implementation utilizes MATLAB to develop six distinct programs that collectively form a complete simulation framework. The program suite includes modules for signal generation using QAM/PSK modulation schemes, AWGN channel modeling with configurable SNR parameters, OFDM modulation/demodulation with IFFT/FFT operations, cyclic prefix insertion/removal, channel equalization techniques, and Bit Error Rate (BER) performance evaluation metrics. Each program focuses on specific aspects: Program 1 handles baseband signal generation and symbol mapping; Program 2 implements OFDM modulation through inverse Fast Fourier Transform (IFFT) processing; Program 3 adds cyclic prefix to combat inter-symbol interference; Program 4 introduces AWGN channel effects using MATLAB's awgn function; Program 5 performs OFDM demodulation with FFT and channel equalization; Program 6 calculates BER performance across varying SNR levels. The simulation generates comprehensive experimental results including constellation diagrams, power spectral density plots, and BER versus SNR curves. These outputs enable thorough analysis of OFDM system characteristics under AWGN conditions, providing insights into spectral efficiency, robustness to noise, and implementation trade-offs. The modular program structure allows researchers to modify parameters like FFT size, modulation order, and channel conditions for customized investigations.