Multicarrier demodulation for frequency selective channels subject to narrow band interferences

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-...

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Bibliographic Details
Published inDigital signal processing Vol. 18; no. 4; pp. 598 - 611
Main Authors Jajamovich, Guido H., Galarza, Cecilia G.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.07.2008
Subjects
DMT
Filter banks
Multicarrier systems
Narrow band interference
Multicarrier systems
DMT
Narrow band interference
Filter banks
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Summary: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.
ISSN:1051-2004
1095-4333
DOI:10.1016/j.dsp.2007.08.007