Simulation of OFDM System under AWGN and Multipath Channels

In this paper, we present a detailed discussion on simulating OFDM systems under both AWGN (Additive White Gaussian Noise) and multipath channel conditions. Our implementation focuses on key OFDM system components and techniques including cyclic prefix insertion for mitigating inter-symbol interference, pilot symbol configuration for channel tracking, channel estimation algorithms (such as LS or MMSE estimators), and bit error rate performance curves. The simulation code typically involves MATLAB functions for generating QAM modulated data, IFFT/FFT operations, channel modeling with specified delay profiles, and BER calculation through Monte Carlo simulations. Additionally, we provide a comprehensive experimental report in English showcasing our research findings and analytical results. Through in-depth exploration of these elements, we aim to better understand and apply OFDM system performance across different channel environments, with code implementations demonstrating practical parameter optimization and performance trade-offs.