  This paper studies the stability and $\mathcal{H}_{\infty}$ performance
analysis problem for linear networked and quantized control systems with both
communication delays random packet losses. To deal with the network-induced
uncertainties and random packet dropouts, a novel discrete-time stochastic
system model is developed for continuous-time networked control systems, and
further overapproximated via a polytopic system with norm-bounded uncertainty.
Based on the overapproximated system model, sufficient conditions are
established for linear networked and quantized control systems in different
cases to guarantee input-to-state stability and $\mathcal{H}_{\infty}$
performance with respect to the network-induced errors. Finally, a numerical
example is presented to illustrated the developed results.
