OFDM Channel Estimation Based on Comb-Type Pilots with MATLAB Simulation Code

This MATLAB simulation source code implements OFDM channel estimation based on comb-type pilots. OFDM (Orthogonal Frequency Division Multiplexing) is a widely used modulation technique renowned for its effectiveness in mitigating multipath channel interference. Channel estimation represents a critical component in OFDM systems, serving to accurately characterize channel properties for effective signal recovery at the receiver end. This MATLAB implementation employs comb-type pilot arrangement for channel estimation, a method that enhances estimation accuracy and robustness against channel variations. The simulation includes key algorithmic components such as pilot insertion at regular subcarrier intervals, least squares (LS) or minimum mean square error (MMSE) estimation techniques at pilot positions, and interpolation methods (linear, spline, or DFT-based) for complete channel response reconstruction. Through comprehensive simulation experiments, users can evaluate the method's performance under various channel conditions including AWGN, Rayleigh fading, and frequency-selective channels, while providing optimization opportunities for pilot spacing and estimation algorithms. The source code serves as an educational and research reference for understanding OFDM channel estimation implementations, featuring modular structure with functions for signal generation, pilot insertion, channel modeling, estimation algorithms, and performance metric calculation.