Groh, Ingmar and Staudinger, Emanuel and Sand, Stephan (2011) Low Complexity High Resolution Maximum Likelihood Channel Estimation in Spread Spectrum Navigation Systems. 74th IEEE Vehicular Technology Conference (VTC-FAll), 5-8 Sep 2011, San Francisco, CA, USA.
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Abstract
Traditionally, the low complexity maximum likelihood (ML) estimation of several closely-spaced superimposed signal replicas in a communications or navigation receiver is per-formed using expectation maximization (EM) or space alternating generalized expectation maximization (SAGE) methods. However, the componentwise decomposition of a multidimensional log-likelihood function according to the EM or SAGE algorithm fails for realistic time-variant channels. Thus, we consider the minimization of a multidimensional log likelihood function for the closely-spaced channel delays. To get this log-likelihood function, we use a decomposition of the highly time-variant channel path phasors based on Slepian’s subspaces. The obtained log-likelihood function enables a coherent averaging over several hundred codewords even for high-mobility receivers. Therefore, we avoid the squaring loss (SL) that appears for the conventional incoherent averaging and incoherent log likelihood functions. Our simulations show that the minimization of coherent log-likelihood functions based on Slepian’s functions yields a root mean square error (RMSE) of the line of sight (LOS) delay estimation that approximates the Cramer-Rao bound (CRB) rather closely.
Item URL in elib: | https://elib.dlr.de/69861/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||
Title: | Low Complexity High Resolution Maximum Likelihood Channel Estimation in Spread Spectrum Navigation Systems | ||||||||||||
Authors: |
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Date: | 2011 | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | spread spectrum system, synchronization, maximum likelihood estimation, multipath mitigation | ||||||||||||
Event Title: | 74th IEEE Vehicular Technology Conference (VTC-FAll) | ||||||||||||
Event Location: | San Francisco, CA, USA | ||||||||||||
Event Type: | international Conference | ||||||||||||
Event Dates: | 5-8 Sep 2011 | ||||||||||||
Organizer: | IEEE Vehicular Technology Society | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||
HGF - Program: | Space (old) | ||||||||||||
HGF - Program Themes: | W KN - Kommunikation/Navigation | ||||||||||||
DLR - Research area: | Space | ||||||||||||
DLR - Program: | W KN - Kommunikation/Navigation | ||||||||||||
DLR - Research theme (Project): | W - Vorhaben GNSS2/Neue Dienste und Produkte (old) | ||||||||||||
Location: | Oberpfaffenhofen | ||||||||||||
Institutes and Institutions: | Institute of Communication and Navigation > Communications Systems | ||||||||||||
Deposited By: | Sand, Dr Stephan | ||||||||||||
Deposited On: | 07 Oct 2011 09:25 | ||||||||||||
Last Modified: | 29 Nov 2016 11:58 |
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