Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2001.09a
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- Pages.907-910
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- 2001
Time Delay Estimation using Third-order Statistics and Subband Adaptive Filtering
3차 통계기법과 서브밴드 적응 필터링을 이용한 시간 지연 추정
Abstract
In this paper, we address a new time delay estimation method using third-order statistics and subband adaptive filtering to improve the accuracy of target detection for acoustic backscattered signals in a noise interference environment. Each reference and primary signals are decorrelated using the multiresolution analysis framework through a M-band discrete wavelet transform(M-DWT). Then noise effect can be reduced. Here, time delays are estimated iteratively in each subband using two different adaptation mechanisms that minimize the mean squared error (MSE) between the references and primary signal. More specifically, third-order cumulants and projection cross-correlation(PCC) criterion are utilized to achieve an effective SNR improvement for the time delay estimation.
Keywords