Angle-Estimation Bias and Coupling-Model Accuracy Requirements for Mutual-Coupling Compensation in 77 GHz Automotive Radar: A Simulation Study Md Nadim Hosain1, Anup Chandra Sagor2, Md Emadur Rahman Ekra1*, Ashikur Mollik1 Abstract Mutual coupling between closely spaced receive elements biases angle-of-arrival (AoA) estimates in automotive radar, and digital compensation removes this bias