  This paper considers data rate limitations for mean square stabilization of
uncertain discrete-time linear systems via finite data rate and lossy channels.
For a plant having parametric uncertainties, a necessary condition and a
sufficient condition are derived, represented by the data rate, the packet loss
probability, uncertainty bounds on plant parameters, and the unstable
eigenvalues of the plant. The results extend those existing in the area of
networked control, and in particular, the condition is exact for the scalar
plant case.
