OFDM Simulation System under Multipath Channels

This project designs and implements an OFDM simulation system optimized for multipath channel conditions. The implementation includes critical digital signal processing stages: channel encoding (using convolutional or LDPC codes), symbol mapping (QAM/PSK constellations), bit interleaving for burst error mitigation, and OFDM modulation with IFFT processing. The system employs decision-directed channel estimation where previously detected symbols are fed back to track channel variations, complemented by pilot-aided initialization. Key algorithmic components include: - Cyclic prefix insertion for multipath immunity - MMSE/LMS adaptive equalization for channel compensation - Forward Error Correction (FEC) coding with Viterbi/Reed-Solomon decoders - BER performance evaluation under varying SNR conditions The architecture enhances robustness against intersymbol interference and frequency-selective fading through iterative channel tracking and equalization techniques.