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This article is part of the series Multirate Systems and Applications.

Open Access Research Article

Frequency-Domain Equalization in Single-Carrier Transmission: Filter Bank Approach

Yuan Yang1*, Tero Ihalainen1, Mika Rinne2 and Markku Renfors1

Author Affiliations

1 Institute of Communications Engineering, Tampere University of Technology, P.O. Box 553, Tampere 33101, Finland

2 Nokia Research Center, P. O. Box 407, Helsinki 00045, Finland

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EURASIP Journal on Advances in Signal Processing 2007, 2007:010438  doi:10.1155/2007/10438

The electronic version of this article is the complete one and can be found online at: http://asp.eurasipjournals.com/content/2007/1/010438


Received:12 January 2006
Revisions received:24 August 2006
Accepted:14 October 2006
Published:10 January 2007

© 2007 Yang et al.

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.

This paper investigates the use of complex-modulated oversampled filter banks (FBs) for frequency-domain equalization (FDE) in single-carrier systems. The key aspect is mildly frequency-selective subband processing instead of a simple complex gain factor per subband. Two alternative low-complexity linear equalizer structures with MSE criterion are considered for subband-wise equalization: a complex FIR filter structure and a cascade of a linear-phase FIR filter and an allpass filter. The simulation results indicate that in a broadband wireless channel the performance of the studied FB-FDE structures, with modest number of subbands, reaches or exceeds the performance of the widely used FFT-FDE system with cyclic prefix. Furthermore, FB-FDE can perform a significant part of the baseband channel selection filtering. It is thus observed that fractionally spaced processing provides significant performance benefit, with a similar complexity to the symbol-rate system, when the baseband filtering is included. In addition, FB-FDE effectively suppresses narrowband interference present in the signal band.

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