In this paper, for MIMO networked control systems with con- sideration of the channel input power constraint, coding–decod- ing, bandwidth limitation and additive white Gaussian noise, the problem of optimal tracking performance is solved. The commu- nication constraints under consideration are finite bandwidth in the feedback channel (forward path) and AWGN in the forward path (feedback channel). Explicit expressions of the minimal tracking error have been obtained by applying the spectral fac- torization technique. The obtained results show that the optimal tracking performance can be influenced by the directions and locations of nonminimum phase zeros and unstable poles of given plant, furthermore, the characters of the reference signal, encod- ing–decoding, the bandwidth and white Gaussian noise are also closely related to the optimal tracking performance. The results also show that the bandwidth and white Gaussian noise of the communication channel may fundamentally constrain the tracking capability. Finally, some examples have been given to illustrate the obtained results.
Furthermore, to report on the single-input multiple-out (SIMO) networked control systems with network-induced delay and data dropout constraints is also practically beneficial and these pro- blems will be discussed in the future work.