Title :
An adaptive subsample delay estimator using a quadrature demodulator
Author :
Maskell, Douglas L. ; Woods, Graham S.
Author_Institution :
Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore
Abstract :
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.
Keywords :
adaptive estimation; adaptive signal processing; antenna arrays; delay estimation; delay filters; demodulators; direction-of-arrival estimation; discrete transforms; phase detectors; FDF; adaptive subsample delay; analogue quadrature phase detector; discrete-time quadrature technique; fractional delay filter; noisy sinusoidal signal; on-line delay estimation algorithm; 1f noise; Delay effects; Delay estimation; Demodulation; Detectors; Interpolation; Phase detection; Sampling methods; Signal resolution; Spatial resolution;
Conference_Titel :
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
Print_ISBN :
0-7803-8185-8
DOI :
10.1109/ICICS.2003.1292619