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

Abstract

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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Correspondence to Yuan Yang.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://doi.org/creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yang, Y., Ihalainen, T., Rinne, M. et al. Frequency-Domain Equalization in Single-Carrier Transmission: Filter Bank Approach. EURASIP J. Adv. Signal Process. 2007, 010438 (2007). https://doi.org/10.1155/2007/10438

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Keywords

  • Simple Complex
  • Filter Bank
  • Cyclic Prefix
  • Channel Selection
  • Narrowband Interference