OFDM Simulation under White Noise and Rayleigh Channel Conditions

This program presents an exemplary implementation of OFDM system simulation under both white Gaussian noise and Rayleigh fading channel conditions, originally featured in our communication modeling and simulation textbook. The MATLAB-coded simulation employs key digital signal processing techniques including inverse fast Fourier transform (IFFT) for orthogonal subcarrier modulation and cyclic prefix insertion for mitigating inter-symbol interference. The implementation framework incorporates channel modeling algorithms that generate AWGN with controlled signal-to-noise ratios and Rayleigh fading profiles using complex Gaussian random variables. Through systematic parameter variation and BER (Bit Error Rate) calculation routines, the simulation enables quantitative analysis of OFDM system robustness across diverse channel scenarios. The codebase includes extensive inline documentation explaining critical operations such as pilot symbol insertion for channel estimation, equalization techniques, and constellation mapping/demapping procedures. These pedagogical annotations help learners comprehend both theoretical foundations and practical implementation considerations for multicarrier communication systems.