Adaptive fractional delay estimation without lock-up
- Resource Type
- Conference
- Authors
- Raman, J.; Weyten, L.
- Source
- ICECS'99. Proceedings of ICECS '99. 6th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.99EX357) Electronics, circuits and systems Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on. 2:737-740 vol.2 1999
- Subject
- Components, Circuits, Devices and Systems
Delay estimation
Interpolation
Convergence
Delay effects
Stochastic processes
Finite difference methods
Adaptive algorithm
Switches
Signal to noise ratio
Adaptive estimation
- Language
Gradient based algorithms for adaptive estimation of fractional time delay are known to suffer from lock-up phenomena to some extend. This is mainly due to errors in the gradient estimate which in turn is caused by interpolation errors. By studying the expected behavior of a class of stochastic descent algorithms, we are able to show that by replacing derivatives with finite differences, lock-up can be prevented. The approach is validated by deriving a robust estimator which combines subsample accuracy with excellent convergence properties in a computational efficient way.