Robust Hybrid Beamforming with Mutual Coupling Compensation for mmWave MIMO

Hybrid beamforming (HBF) is a promising solution for millimeter-wave (mmWave) communications, enabling high data rates with reduced hardware complexity. However, existing HBF designs typically assume ideal antenna arrays and ignore mutual coupling, which can significantly degrade performance in practice. In this paper, we present a coupling-aware HBF framework that explicitly models electromagnetic interactions between antenna elements via impedance-derived coupling matrices. We formulate a modified hybrid precoding and combining problem and solve it using a variant of Orthogonal Matching Pursuit (OMP) tailored to the coupled system. Simulations show that the proposed approach effectively mitigates performance degradation from mutual coupling and maintains near-ideal symbol error rate across a wide range of array configurations and spatial correlation levels.