Accuracy enhancement 1 B5G mobile communication 1 Computer hardware 1 Direction of arrival 1 Direction of arrival estimation 1 Directionof-arrival (DOA) 1 Loaded cavity 1 Machine learning 1 Millimeter waves 1 Mixing 1 Mixing mechanisms 1 Mobile communications 1 Mode mixing 1 Network layers 1 Radiation mode 1 Receiving antennas 1 Wave dynamics 1 antennas 1 channel estimation 1 diversity reception lens antennas 1