State estimation is essential in monitoring any Cyber-Physical System. When there is a wireless communication channel present between sensor and remote estimator, the imperfections associated with wireless channel like packet loss and quantization error due to limited capacity of the channel will have major impact on estimation. Hence, studying the effect of these imperfections is very important for critical cyber-physical system applications. In this paper, we model and study the effect of quantization and the joint effect of both packet loss and quantization on the estimation and give error covariance bounds. © 2017 IEEE.