OFDM Basic Principles Source Code with BER Performance Analysis

This document presents a MATLAB-based source program that implements the core principles of Orthogonal Frequency Division Multiplexing (OFDM). The code features a comprehensive simulation framework that generates and analyzes the relationship between Bit Error Rate (BER) and Signal-to-Noise Ratio (SNR), with graphical visualization capabilities. The implementation includes key OFDM components such as QAM modulation/demodulation, IFFT/FFT operations for orthogonal subcarrier generation, cyclic prefix insertion/removal, and AWGN channel modeling. The modular architecture allows for straightforward extensions to incorporate advanced OFDM features including carrier frequency offset compensation techniques (using pilot symbols or preamble-based estimation), channel estimation algorithms (LS, MMSE methods), and adaptive modulation schemes. Through this well-structured codebase, researchers and engineers can gain practical understanding of OFDM system operations and develop more sophisticated communication system simulations. Key implementation details include: - Configurable parameters for FFT size, cyclic prefix length, and modulation order - Monte Carlo simulation approach for statistical BER analysis - Real-time plotting functions for performance metric visualization - Error calculation modules comparing transmitted and received symbols - Scalable framework supporting MIMO-OFDM and other advanced configurations