Water-filling Algorithm Implementation in MIMO OFDM Systems

In MIMO OFDM systems, the water-filling algorithm can be employed to enhance system performance. The water-filling algorithm is an optimization technique that improves system capacity and robustness by strategically allocating additional power to subcarriers, analogous to pouring water into a container with an irregular bottom. This MATLAB simulation implements a MIMO OFDM system utilizing the water-filling algorithm and conducts comprehensive performance evaluations. The simulation considers various modulation schemes (such as QPSK, 16-QAM, and 64-QAM), diverse channel conditions (including Rayleigh and Rician fading), and multiple antenna configurations (e.g., 2x2, 4x4 MIMO setups) to thoroughly assess system performance. Through this simulation program, users can gain deeper insights into the operational principles of MIMO OFDM systems and the water-filling algorithm, while obtaining valuable references for practical system design and optimization. The implementation includes key MATLAB functions for channel matrix generation, singular value decomposition for modal decomposition, and power allocation calculations based on the water-filling principle.