Multicarrier demodulation for frequency selective channels subject to narrow band interferences

  • Authors:
  • Guido H. Jajamovich;Cecilia G. Galarza

  • Affiliations:
  • Centre de Mathématiques et de Leurs Applications, École Normale Supérieure de Cachan-61, Avenue du Président Wilson, 94235 Cachan Cedex, France;Departamento de Ingeniería Electrónica, Facultad de Ingeniería, Universidad de Buenos Aires, Avenida Paseo Colón 850, Buenos Aires 1063, Argentina

  • Venue:
  • Digital Signal Processing
  • Year:
  • 2008

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Abstract

Nowadays, multicarrier modulation (MCM) systems based on the discrete Fourier transform are commonly used to transmit over frequency selective channels subject to aggressive noise disturbances. However, these transceivers suffer from poor subchannel spectral containment, that is, the level of inter-channel interference is not negligible. It can be shown that the system performance decreases when it is subject to a disturbance with most of its energy concentrated on a narrow frequency band. To improve the quality of service under these conditions, we present general MCM systems based on filter bank transformations. Lately, we add an equalizer at the channel output to implement these techniques over frequency selective channels, and we introduce a set of design strategies for the equalizer. Finally, we evaluate the performance of the overall system by simulating a frequency selective channel subject to narrow band interference.