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An all digital DLL implemented as dynamical state estimator

Authors:: Bohmann, J. , Meyr, H.
Journal:: IEEE Trans. Acoust., Speech and Signal Processing
Volume:: ASSP-34
Page(s):: 535-545
number:: 3
Date:: Jun. 1986
DOI:: 10.1109/ICASSP.1984.1172779
Language:: English
Abstract:: The Delay-Locked-Loop (DLL) is a device that automatically adjusts a local delay-estimate to the time-delay between two versions of an incoming signal. It has been shown by Meyr [1] that in the sense of local variance this device performs as well as the Maximum Likelihood Estimator proposed earlier [2], whereas the implementation cost can be considerably reduced. This contribution deals with a baseband type of the DLL, which was developed for non-contact speed measurement by means of two signals generated by spatially separated infrared sensors. To obtain an unbiased estimate under meaningful signal assumptions, a dynamical state estimator for the above mentioned quantities was included. We present an all digital implementation of the device with a novel numerical controled oscillator that allows to match the loop to a very wide range of the sampling rate by gain scheduling.
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