Control over bandlimited communication channels intersampling performance

Most networked sampled data control systems involve transmission of feedback and actuation signals over finite bandwidth communication channels. In an earlier paper, [S. Dasgupta, 2003] we had demonstrated that this restriction on the transmission bandwidth severely impairs stabilizability should the sampling rate exceed the Nyquist frequency of the communication channels conveying the feedback and actuation signals. In this paper we examine the effect of such bandwidth limitation to the intersample behavior of the closed loop system. While it is well known that slower sampling degrades intersample performance [J.S. Freudenberg et al., 1995] in the presence of delays, the results here quantify the severe performance degradation when the sampling is too fast.