3 research outputs found
An Improved Stability Condition for Kalman Filtering with Bounded Markovian Packet Losses
In this paper, we consider the peak-covariance stability of Kalman filtering
subject to packet losses. The length of consecutive packet losses is governed
by a time-homogeneous finite-state Markov chain. We establish a sufficient
condition for peak-covariance stability and show that this stability check can
be recast as a linear matrix inequality (LMI) feasibility problem. Comparing
with the literature, the stability condition given in this paper is invariant
with respect to similarity state transformations; moreover, our condition is
proved to be less conservative than the existing results. Numerical examples
are provided to demonstrate the effectiveness of our result
Integrated Stabilization Policy over a Software Defined Network
In this paper, we mainly investigate an integrated system operating under a
software defined network (SDN) protocol. SDN is a new networking paradigm in
which network intelligence is centrally administered and data is communicated
via channels that are physically separated from those conveying user data.
Under the SDN architecture, it is feasible to set up multiple flows for
transmitting control signals to an actuator with high priority for each
individual application. While each flow may suffer random transmission delay,
we focus on the stabilization problem under the joint design of the
event-driven strategy in actuator and the control policy in decision-maker. By
introducing a predefined application time, the integrated system can be
reformulated as the form of stochastic system with input delay and
multiplicative noise. For such system, we propose a set of necessary and
sufficient stabilization conditions. Specifically, for the scalar system, we
derive the allowable sampling period bound that can guarantee stabilization in
terms of the probability distributions of the random transmission delays. A
simple example is included to show the performance of our theoretic results
Optimal sensor scheduling under intermittent observations subject to network dynamics
Motivated by various distributed control applications, we consider a linear
system with Gaussian noise observed by multiple sensors which transmit
measurements over a dynamic lossy network. We characterize the stationary
optimal sensor scheduling policy for the finite horizon, discounted, and
long-term average cost problems and show that the value iteration algorithm
converges to a solution of the average cost problem. We further show that the
suboptimal policies provided by the rolling horizon truncation of the value
iteration also guarantee stability and provide near-optimal average cost.
Lastly, we provide qualitative characterizations of the multidimensional set of
measurement loss rates for which the system is stabilizable for a static
network, significantly extending earlier results on intermittent observations.Comment: 25 page