Unbiased estimation of the solution to Zakai's equation

Hamza M. Ruzayqat, Ajay Jasra

Research output: Contribution to journalArticlepeer-review


In the following article, we consider the non-linear filtering problem in continuous time and in particular the solution to Zakai's equation or the normalizing constant. We develop a methodology to produce finite variance, almost surely unbiased estimators of the solution to Zakai's equation. That is, given access to only a first-order discretization of solution to the Zakai equation, we present a method which can remove this discretization bias. The approach, under assumptions, is proved to have finite variance and is numerically compared to using a particular multilevel Monte Carlo method.
Original languageEnglish (US)
JournalMonte Carlo Methods and Applications
StatePublished - Jan 1 2020


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