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A new time-delay estimation in multipath
Abstract
This paper addresses a new approach to time-delay estimation based upon the autocorrelation estimator (AE). The primary aim of this paper is to estimate time-delays in a multipath environment in absence of prior knowledge of the channel. The maximum likelihood estimator (MLE) and AE are two computational tools that are used to determine the parameters of a multipath channel. MLE requires some priori knowledge of the source signal and the channel; AE can be a blind estimator but it is more suitable for a simple propagation model (one extra path). Under the multipath assumption we prove that if the observation sequence is zero padded the performance of MLE exceeds that of AE, however, at the price of higher computational efforts. The general autocorrelator estimator (GAE), based on autocorrelation of the received signal, is introduced. The GAE is formulated as a blind estimator, and the pertinent Cramer-Rao lower bounds (CRLB) are derived. We also develop an algorithm to estimate the parameters of a multipath environment based on the new generalization. The performance of this algorithm is examined for different signal-noise scenarios. Our results show that the time-delays are estimated accurately based on the proposed algorithm.
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Metadata
- Authors
- Moghaddam, P. P., Amindavar, H., & Kirlin, R. L.
- Affiliations
- Earthquake Research Institute, University of Tokyo (JP)
- Amirkabir University of Technology (IR)
- University of Victoria (CA)
- Venue
- IEEE Transactions on Signal Processing
- Published
- 2003-05
- Volume
- 51
- Issue
- 5
- Pages
- 1129-1142
- ISSN
- 1053-587X (ISSN-L)
- OpenAlex
- W2163388956
- Cited by
- 47
- References
- 16
- Citations by year
- 2022: 1 · 2020: 4 · 2019: 1 · 2018: 2 · 2017: 1 · 2015: 4 · 2014: 2 · 2013: 1 · 2012: 1
- FWCI
- 4.68
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Transactions on Signal Processing (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Wireless Communication Techniques
- Physical Sciences › Engineering › Aerospace Engineering › Radar Systems and Signal Processing
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Ultra-Wideband Communications Technology
- Keywords
- time delay estimation, multipath channels, blind estimation, maximum likelihood estimation, Cramer-Rao lower bound, zero-padding, parameter estimation algorithm, unknown channel
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