Signal to noise ratio Wireless communications Channel estimation 3 Wireless communication 3 Array processing 2 Array signal processing 2 Bit error rate 2 MIMO systems 2 Performance 2 Symbol 2 Symbols 2 Training 2 Active/passive 1 Adaptive behaviour 1 Adaptive models 1 Antennas 1 Beam forming networks 1 Beamforming 1 Channel knowledge 1 Channel knowledge map 1 Channel prediction 1 Channel state information 1 Cognitive communications 1 Cognitive learning 1 Cognitive systems 1 Communication channels (information theory) 1 Complex networks 1 DACE 1 Data aided channel estimation 1 Data models 1