Impact of Different Signal-to-Noise Ratios on BER Performance in OFDM Systems

This MATLAB simulation code demonstrates how different Signal-to-Noise Ratio (SNR) values affect the Bit Error Rate (BER) performance in Orthogonal Frequency Division Multiplexing (OFDM) systems. OFDM is a widely-used multi-carrier modulation technique that plays a crucial role in modern wireless communication systems. The simulation implements key OFDM components including: - QAM modulation/demodulation for symbol mapping - IFFT/FFT operations for orthogonal subcarrier generation - Cyclic prefix addition and removal for mitigating inter-symbol interference - AWGN channel modeling with configurable SNR levels By systematically varying the SNR parameter from low to high values (typically 0-20 dB), the code generates BER curves that show the performance degradation under poor channel conditions and improvement with better signal quality. The simulation employs Monte Carlo techniques with multiple transmission frames to ensure statistical reliability of BER measurements. This experimental approach helps researchers and engineers understand OFDM system behavior under different channel conditions, providing valuable insights for optimizing system parameters and designing robust wireless communication systems. The modular code structure allows easy modification of parameters such as modulation order, number of subcarriers, and channel models for extended analysis.