Title: Blind estimator for time delays in multipath acoustic channel-estimator performance vs. noise and number of multipath

Authors: Ravinder Nath, Ajit Kumar Chaturvedi, Govind Sharma

Addresses: Department of Electrical Engineering, National Institute of Technology Hamirpur, Hamirpur 177005, India. ' Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India. ' Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India

Abstract: A Modified Blind Estimator (Modified Autocorrelation-based Estimator – MAE) algorithm is presented for estimation of time delays in multipath acoustic channel in the presence of uncorrelated noise. Here, the multipath acoustic channel output signal is modelled as a superposition of the delayed, attenuated and filtered versions of the stationary Gaussian stochastic input signal. Different performance measures have been introduced to characterise the performance of the estimator. The simulation results show that MAE performance approaches the equivalent Cramer-Rao Lower Bound (CRLB) in terms of Accuracy Percentage (AP) measures, AP_CRLB, in the high Signal to Noise Ratio (SNR) ranges. Furthermore, it is observed from simulations that when the SNR increases or the number of paths decreases the performance of MAE improves.

Keywords: time delay estimator; autocorrelation-based estimator; multipath acoustic channels; blind estimator; uncorrelated noise; modelling; performance measures; simulation.

DOI: 10.1504/IJSISE.2011.039180

International Journal of Signal and Imaging Systems Engineering, 2011 Vol.4 No.1, pp.13 - 20

Published online: 13 Mar 2015 *

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