Efficient design of pulse shaping filters for OFDM systems
ReferenceSPIE Proc., "Wavelet Applications in Signal and Image Processing VII", Denver (CO), July 1999, Vol. 3813, pp. 625-636, July 1999, (invited paper).
AbstractOrthogonal frequency division multiplexing (OFDM) has recently become a popular technique for high-data-rate transmission over wireless channels. Due to the time-frequency dispersion caused by the channel, the performance of OFDM systems depends critically on the time-frequency localization of the pulse shaping filters. In this paper, we show how the recent duality and biorthogonality theory [1,2] developed in the context of Weyl-Heisenberg frames can be used to devise simple and efficient design procedures for well-localized OFDM pulse shaping filters. We consider OFDM systems employing time-frequency guard regions and OFDM systems based on offset QAM. We propose FFT-based design methods for pulse shaping filters with arbitrary length and arbitrary overlapping factors. Finally, we present some design examples.
KeywordsOFDM, pulse shaping, guard regions, filter design, Weyl-Heisenberg frames, duality and biorthogonality, time-frequency localization, Zak transform
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