Networked estimation under contention-based medium access
2010 (English)In: International Journal of Robust and Nonlinear Control, ISSN 1049-8923, E-ISSN 1099-1239, Vol. 20, no 2, 140-155 p.Article in journal (Refereed) Published
This paper studies networked estimation over a communication channel shared by a contention-based medium access protocol. A collection of N identical and physically decoupled scalar systems are sampled without sensor noise and transmitted over a common channel, using a contention-based medium access mechanism. We first carry out a calculation of the average distortion in estimation with irregular samples. Given the rate of packet generation at sensors, we characterize the traffic characteristics of the some contention-based MAC schemes. This lets us derive the statistics of inter-arrival times which in turn allows us to compute the packet loss rates and also the statistics of delay within a sample period. Using these results, we track the estimation performance as the sample generation rate and the number of contending nodes are varied. We provide a heuristic rule-of-thumb for choosing the sampling interval which minimizes the average distortion. By combining the network traffic characterization with that of the estimation performance, we show this rule performs pretty well. Carrying along the same lines, we are able to compute the scaling limits of estimation performance with respect to the number of contending nodes.
Place, publisher, year, edition, pages
2010. Vol. 20, no 2, 140-155 p.
networked estimation, cross-layer analysis, cross-layer tradeoffs, MAC, protocols, sampling rates, communication bandwidth constraints, control-systems
IdentifiersURN: urn:nbn:se:kth:diva-19108DOI: 10.1002/rnc.1459ISI: 000273545600003ScopusID: 2-s2.0-75749100976OAI: oai:DiVA.org:kth-19108DiVA: diva2:337155
QC 201005252010-08-052010-08-052011-01-27Bibliographically approved