Channel state information Communication channels (information theory) 2 Optimisations Optimization 2 Array processing 1 Array signal processing 1 Beamforming 1 Blocking eavesdroppe 1 Blockings 1 Cascaded parameter decoupling 1 Channel estimation 1 Conformal intelligent reconfigurable surface 1 Conformal mapping 1 Convex optimization 1 Decouplings 1 Eavesdroppe 1 Eavesdropping 1 Environment mapping 1 Estimation 1 Frequency estimation 1 Imperfect channel state information 1 Information security 1 Iterative methods 1 Least squares approximations 1 MIMO OFDM channel estimation 1 MIMO systems 1 Mapping problem 1 Multiple intelligent reflecting surface 1 Multipleinput multiple-output orthogonal frequency-division multiplexing systems (MIMO-OFDM) 1 Multiplexing equipment 1