OFDM Transmitter, Channel, and Receiver Complete System Simulation with MATLAB Implementation

A complete OFDM transmitter, channel, and receiver system was implemented using MATLAB language based on the OFDM simulation model. The system implementation includes key components: serial-to-parallel conversion, QAM modulation, IFFT processing for orthogonal subcarriers, cyclic prefix insertion to mitigate inter-symbol interference, and parallel-to-serial conversion for transmission. Through proper system simulation, performance improvement methods including cyclic prefix configuration and channel estimation algorithms (such as LS or MMSE estimators) were further validated, yielding expected optimal results. The system employs pilot-based channel estimation where predefined pilot symbols are inserted in the frequency domain to track channel variations. Additionally, comprehensive performance optimization and functional extensions were implemented to enhance system reliability and flexibility, including adaptive modulation schemes and error correction coding integration. The MATLAB code structure features modular design with separate functions for transmitter chain (ofdm_tx), channel modeling (channel_model), and receiver processing (ofdm_rx) to facilitate performance analysis and parameter tuning.