线性时变系统辨识的密度准则
Density Criteria for the Identification of Linear Time-Varying Systems
摘要:
本文讨论了识别线性时变(LTV)系统的特点是(可能是无限的)离散集的延迟和多普勒频移的问题。我们证明了稳定的可识别性是可能的,如果上均匀Beurling密度的延迟多普勒支持集严格小于1/2和稳定的可识别性是不可能的密度严格大于1/2。这个密度定理的证明揭示了LTV系统辨识和Bargmann-Fock空间中的插值之间的有趣关系。最后,我们介绍了一个子空间方法来解决手头的系统辨识问题。
英文摘要:
This paper addresses the problem of identifying a linear time-varying (LTV) system characterized by a (possibly infinite) discrete set of delays and Doppler shifts. We prove that stable identifiability is possible if the upper uniform Beurling density of the delay-Doppler support set is strictly smaller than 1/2 and stable identifiability is impossible for densities strictly larger than 1/2. The proof of this density theorem reveals an interesting relation between LTV system identification and interpolation in the Bargmann-Fock space. Finally, we introduce a subspace method for solving the system identification problem at hand.
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