Frequency-domain equalization in single-carrier transmission: filter bank approach

  • Authors:

  • Yuan Yang;Tero Ihalainen;Mika Rinne;Markku Renfors

  • Affiliations:

  • Institute of Communications Engineering, Tampere University of Technology, Tampere, Finland;Institute of Communications Engineering, Tampere University of Technology, Tampere, Finland;Nokia Research Center, Helsinki, Finland;Institute of Communications Engineering, Tampere University of Technology, Tampere, Finland

  • Venue:
  • EURASIP Journal on Applied Signal Processing
  • Year:
  • 2007

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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.