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An on-line delay estimation algorithm based upon an analogue quadrature phase detector that is suitable for determining the subsample delay between two noisy sinusoidal signals is introduced. The new estimator uses a discrete-time quadrature technique to directly update the delay estimate, which is in turn used to adapt the coefficients of a simple fractional delay filter (FDF). The estimator is insensitive to variations in the amplitudes of the input signals, is simple to implement and has a reduced complexity compared to other adaptive techniques. Simulations show that in the presence of system noise, the new estimator significantly outperforms conventional fractional delay filter based estimators.
Information, Communications and Signal Processing, 2003 and Fourth Pacific Rim Conference on Multimedia. Proceedings of the 2003 Joint Conference of the Fourth International Conference on (Volume:2 )
Date of Conference: 15-18 Dec. 2003