The problem of extraction/elimination of a nonstationary sinusoidal signal from noisy measurements is considered. This problem is usually solved using adaptive notch filtering (ANF) algorithms. It is shown that the accuracy of frequency estimates can be significantly increased if the results obtained from ANF are backward-time filtered by an appropriately designed lowpass filter. The resulting adaptive notch smoothing (ANS) algorithm can be employed to perform many offline signal processing tasks, such as elimination of sinusoidal interference from a prerecorded signal, for example. We show that when the unknown signal frequency drifts according to the random-walk model, the optimally tuned ANS algorithm is, under Gaussian assumptions, statistically efficient, i.e., it attains the Cramér-Rao-type lower smoothing bound, which limits accuracy of any (whether causal or not) frequency estimation scheme.
Authors
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1109/tsp.2008.921781
- Category
- Publikacja w czasopiśmie
- Type
- artykuł w czasopiśmie z listy filadelfijskiej
- Language
- angielski
- Publication year
- 2008
