On channel estimation and equalization of OFDM systems with insufficient cyclic prefix

Muhammad Danish Nisar, Wolfgang Utschick, Hans Nottensteiner, Thomas Hindelang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

18 Scopus citations

Abstract

Inherent inter-symbol and inter-carrier interference elimination ability of cyclic prefixed OFDM transmission fails for the case of multipath fading channels when the Channel Impulse Response (CIR) length exceeds the duration of Cyclic Prefix (CP). Conventional channel estimation and equalization schemes, if applied to this case of insufficient CP, suffer significant performance degradation. We propose, in this paper, a channel estimation scheme that enables estimation of the complete CIR even beyond the CP length. We then design an optimal MMSE based equalizer for the suppression of insufficient CP generated interference. A robust and low complexity version of this equalizer is also derived. Simulation results for the proposed schemes show significant performance gain at low SNRs and drastic reduction of the error floors at high SNRs and more importantly, as opposed to earlier schemes, without any loss in transmission efficiency.

Original languageEnglish
Title of host publication2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring
Pages1445-1449
Number of pages5
DOIs
StatePublished - 2007
Event2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring - Dublin, Ireland
Duration: 22 Apr 200725 Apr 2007

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Conference

Conference2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring
Country/TerritoryIreland
CityDublin
Period22/04/0725/04/07

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