QAM Program and OFDM Main Program with MATLAB Implementation

This is a MATLAB-based program implementing a complete digital communication system. The code structure includes well-documented modules for system initialization parameters, QAM (Quadrature Amplitude Modulation) constellation mapping/demapping with configurable modulation orders, OFDM (Orthogonal Frequency Division Multiplexing) main processing with IFFT/FFT operations and cyclic prefix handling, transmitter/receiver chain implementation, and serial-to-parallel data conversion utilities. Each module contains detailed comments explaining the underlying algorithms, such as QAM symbol mapping using quadrant-based decision regions and OFDM subcarrier allocation techniques. The implementation allows for straightforward integration of additional features like error detection/correction codes (e.g., CRC or convolutional coding), bit error rate performance evaluation through Monte Carlo simulations, and system optimization parameters for different channel conditions. The modular design ensures clear separation of concerns, making it suitable for educational purposes and practical communication system prototyping.