channel estimation Accuracy enhancement 1 B5G mobile communication 1 Channel estimation 1 Computer hardware 1 Crame-Rao lower bounds 1 Crame-rao low bound 1 Cramer Rao lower bound 1 Cramer-Rao bounds 1 Cramer-Rao lower bound (CRLB) 1 Direction of arrival 1 Direction of arrival estimation 1 Directionof-arrival (DOA) 1 Equalizers 1 Frequency estimation 1 LSTM network 1 Loaded cavity 1 Machine learning 1 Maximum likelihood estimation 1 Millimeter waves 1 Mixing 1 Mixing mechanisms 1 Mobile communications 1 Mode mixing 1 Multi-node synchronization 1 Multi-nodes 1 Network layers 1 OFDM systems 1 Radiation mode 1 Radio frequency 1