MATLAB Simulation of OFDM and QAM Modulation Techniques

This MATLAB simulation program implements both OFDM and QAM modulation techniques for signal transmission analysis. The implementation includes complete simulation frameworks for both modulation schemes, with key functions handling signal generation, modulation/demodulation processes, and performance evaluation metrics. OFDM modulation employs a multi-carrier approach that divides data streams across multiple orthogonal subcarriers, implemented through IFFT/FFT operations for efficient spectral utilization. QAM modulation utilizes constellation mapping to encode data points using both phase and amplitude variations, with the simulation supporting various modulation orders (16-QAM, 64-QAM, etc.). The comparative analysis module evaluates both techniques under different channel conditions, measuring performance indicators such as bit error rate (BER), spectral efficiency, and robustness to noise/interference. The simulation includes channel modeling components that introduce AWGN and multipath effects to test modulation resilience. Through systematic comparison and performance simulation, this program provides insights into the trade-offs between OFDM's resistance to multipath fading and QAM's spectral efficiency advantages. The modular code structure allows researchers to modify parameters, test custom scenarios, and extend the framework for advanced communication system studies, serving as a valuable reference for selecting appropriate modulation schemes in practical signal transmission applications.