MIMO systems Wireless communication 4 Wireless communications Reconfigurable 3 Channel estimation 2 Communication channels (information theory) 2 Mean square error 2 Metasurface 2 Reconfigurable intelligent surface 2 Signal to noise ratio 2 Active/passive 1 Antenna arrays 1 Array processing 1 Array signal processing 1 Artificial intelligence 1 Beamforming 1 Bit error rate 1 Buildings 1 Channel knowledge 1 Channel knowledge map 1 Channel state information 1 Co-existence 1 Covariance matrix 1 DACE 1 Data aided channel estimation 1 Data symbols 1 Data-aided 1 Dynamic metasurface antenna 1 Electromagnetic exposure 1 Electromagnetic waves 1