Estimation Mean square error 8 Errors 5 Optimization 5 Sensors 5 Signal to noise ratio 5 Frequency estimation 4 Numerical methods 4 Optimisations 4 Convergence 3 Covariance matrices 3 Covariance matrix 3 Data driven 3 Electric load flow 3 Electric power distribution 3 Feature extraction 3 Features extraction 3 Iterative methods 3 Linear transformations 3 MIMO systems 3 Machine learning 3 Mathematical models 3 Neural networks 3 Quality control 3 Regression analysis 3 Training 3 Battery management systems 2 Bit error rate 2 Channel estimation 2 Channel state information 2