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Iterative Intercarrier Interference Mitigation for Pilot-Aided OFDM Channel Estimation Based on Channel Linearizations

Groh, Ingmar and Gentner, Christian and Sand, Stephan (2012) Iterative Intercarrier Interference Mitigation for Pilot-Aided OFDM Channel Estimation Based on Channel Linearizations. 76th IEEE Vehicular Technology Conference (VTC-Fall), 3-6 Sep 2012, Québec City, Canada.

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Abstract

Orthogonal frequency division multiplexing (OFDM) became a popular transmission approach since it suppresses intersymbol interference (ISI) due to large channel delays. However, intercarrier interference (ICI) for high mobility receivers yields corrupted channel estimates for pilot-aided OFDM channel estimation. Thus, this paper presents a novel time-variant channel estimation approach to mitigate this system impairment. We linearize the time-variant channel and determine the expansion point by channel estimates corresponding to the current OFDM symbol, and we get the unknown channel slopes by an iterative data and channel estimation. Our algorithm combines a least squares or a minimum norm channel slope estimation and the detection of the channel paths. It sets any channel path power equal zero once the corresponding power estimate is smaller than a given threshold. Our algorithm exploits the large channel correlations between the cyclic prefix and the successive OFDM symbol optimally. These maximum correlations reason the superiority of ICI mitigation with cyclic prefixes compared to channel slope estimation with adjacent OFDM symbols, which needs at least twice the number of pilot symbols. Additionally, our iterative ICI mitigation reduces noise impairments.

Item URL in elib:https://elib.dlr.de/96104/
Document Type:Conference or Workshop Item (Speech)
Title:Iterative Intercarrier Interference Mitigation for Pilot-Aided OFDM Channel Estimation Based on Channel Linearizations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Groh, IngmarIntel Mobile CommunicationsUNSPECIFIED
Gentner, ChristianChristian.Gentner (at) dlr.deUNSPECIFIED
Sand, StephanStephan.Sand (at) dlr.deUNSPECIFIED
Date:2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:orthogonal frequency division multiplexing, intercarrier interference, Taylor series expansion, iterative timevariant pilot-aided channel estimation
Event Title:76th IEEE Vehicular Technology Conference (VTC-Fall)
Event Location:Québec City, Canada
Event Type:international Conference
Event Dates:3-6 Sep 2012
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:29 Apr 2015 11:24
Last Modified:29 Apr 2015 11:24

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