  The communication channels used to convey information between the components
of wireless networked control systems (WNCSs) are subject to packet losses due
to time-varying fading and interference. We consider a wireless networked
control scenario, where the packet loss occurs in both the sensor-controller
link (sensing link) and the controller-actuator link (actuation link).
Moreover, we consider one time-step delay mode observations of the actuation
link. While the problems of state feedback optimal control and stabilizability
conditions for systems with one time-step delay mode observations of the
actuation link have been already solved, we study the optimal output feedback
control problem, and we derive a separation principle for the aforementioned
wireless networked control scenario. Particularly, we show that the optimal
control problem (with one time-step delay in the mode observation of actuation
link state) and the optimal filtering problem can be solved independently under
a TCP-like communication scheme.
