The informative enough property of the data set in a Networked Control System

Problems related to the identifiability of Networked Control Systems (NCSs) are studied in this paper. The informative enough property is a necessary condition to ensure a system's identifiability. In this paper, it is proved that the data set which is not informative enough with respect to some model sets in a conventional closed-loop system will become informative enough with respect to these model sets in an NCS, due to the random delay and packet dropout introduced by network transmission. The result shows that the random network influence of NCSs which is usually treated as being harmful can bring benefit to the identifiability of closed-loop system identification.