MATLAB Code Implementation for OFDM QPSK Simulation

The article presents a MATLAB-based OFDM QPSK simulation program that incorporates all code within a single text file. The implementation includes core OFDM components such as QPSK modulation/demodulation, IFFT/FFT operations for orthogonal subcarrier generation, cyclic prefix insertion/removal, and channel modeling for transmission simulation. Comprehensive testing and analysis have been conducted to validate program effectiveness and accuracy, including bit error rate (BER) calculations and signal-to-noise ratio (SNR) performance evaluations. Performance optimization techniques have been applied to enhance computational efficiency, particularly through vectorized MATLAB operations and optimized memory management. Additional functionality includes automated processing routines for batch simulations and result visualization capabilities using MATLAB's plotting functions to display constellation diagrams, power spectral density, and BER versus SNR curves. These features improve usability and result interpretation. This complete OFDM QPSK simulation toolkit provides a robust foundation for wireless communication system analysis, suitable for educational demonstrations, research prototyping, and algorithm validation across various application scenarios.