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arXiv 0906.0259math.PR
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用隐马尔可夫模型逼近扩散

Approximating a Diffusion by a Hidden Markov Model

Ioannis Kontoyiannis, Sean P. Meyn

摘要:

对于一类连续时间Markov过程,包括在$\RL^d$的开连通子集上发展的所有不可约亚椭圆扩散,证明了下列等价性:(i)过程满足经典的Donsker-Varadhan条件(稍微弱一点的版本);(ii)该过程的转移半群可以用有限状态隐马尔可夫模型来近似,在一个强意义上,用一个相关的算子范数来近似;(iii)过程的预解核是“$v$ -可分离的”,也就是说,它可以用有限秩核在算子范数下任意好地近似。在任何(因此所有)上述条件下,马尔可夫过程被证明有一个纯粹的离散谱上的自然相关的加权$L_\infty$空间。

英文摘要:

For a wide class of continuous-time Markov processes, including all irreducible hypoelliptic diffusions evolving on an open, connected subset of $\RL^d$, the following are shown to be equivalent: (i) The process satisfies (a slightly weaker version of) the classical Donsker-Varadhan conditions; (ii) The transition semigroup of the process can be approximated by a finite-state hidden Markov model, in a strong sense in terms of an associated operator norm; (iii) The resolvent kernel of the process is `$v$-separable', that is, it can be approximated arbitrarily well in operator norm by finite-rank kernels. Under any (hence all) of the above conditions, the Markov process is shown to have a purely discrete spectrum on a naturally associated weighted $L_\infty$ space.

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