TAILIEUCHUNG - Báo cáo: Semiblind Channel Estimation for IFDMA in Case of Channels with Large Delay Spreads

Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011, Article ID 857859, 17 pages doi: Research Article Semiblind Channel Estimation for IFDMA in Case of Channels with Large Delay Spreads Anja Sohl (EURASIP Member) and Anja Klein Communications Engineering Lab, Technische Universit¨ t Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany a Correspondence should be addressed to Anja Sohl, Received 15 April 2010; Revised 4 October 2010; Accepted 14 November 2010 Academic Editor: Hikmet Sari Copyright © 2011 A. Sohl and A. Klein. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution,. | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 857859 17 pages doi 2011 857859 Research Article Semiblind Channel Estimation for IFDMA in Case of Channels with Large Delay Spreads Anja Sohl EURASIP Member and Anja Klein Communications Engineering Lab Technische Universitat Darmstadt Merckstrafie 25 64283 Darmstadt Germany Correspondence should be addressed to Anja Sohl Received 15 April 2010 Revised 4 October 2010 Accepted 14 November 2010 Academic Editor Hikmet Sari Copyright 2011 A. Sohl and A. Klein. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Discrete Fourier Transform- DFT- precoded Orthogonal Frequency Division Multiple Access OFDMA with interleaved subcarrier allocation per user is considered which is denoted as Interleaved Frequency Division Multiple Access IFDMA . For IFDMA the received signal exhibits a cyclostationarity with the parameter Q which defines the number of allocated subcarriers per user. In previous works we have shown that this cyclostationarity can be exploited for the application of subspace-based semiblind channel estimation to IFDMA. Nevertheless the formerly proposed algorithm is restricted to channels with small delay spreads meaning that the number of channel delay taps needs to be smaller than Q. In this paper we introduce a new semiblind subspace-based channel estimation algorithm which identifies a subspace of the received signal that is spanned by the Q elements of the so-called cyclic channel impulse response. By doing so the number of elements to be estimated is reduced and the proposed algorithm is able to cope with channels with large delay spreads. 1. Introduction At present research activities for beyond third generation 3G of mobile radio systems are in progress .

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