MATLAB System Simulation of OFDM with Channel Estimation Performance Analysis

This is a MATLAB simulation experiment focused on Orthogonal Frequency Division Multiplexing (OFDM) systems. The implementation utilizes Quadrature Phase Shift Keying (QPSK) modulation scheme and incorporates comb-type pilot arrangement for Least Squares (LS) channel estimation. The simulation includes detailed algorithm implementations where pilot symbols are strategically inserted in the frequency domain to facilitate channel response estimation. Furthermore, we conducted a comprehensive performance comparison between LS and Minimum Mean Square Error (MMSE) channel estimation methods, analyzing their respective advantages and limitations through metrics like Bit Error Rate (BER) and Mean Square Error (MSE). The MATLAB code implements key functions including FFT/IFFT operations for OFDM modulation/demodulation, pilot insertion and extraction routines, and comparative analysis modules for evaluating estimation accuracy under different signal-to-noise ratio conditions.