Design of pulse shaping OFDM/OQAM systems for high data-rate transmission over wireless channels


Helmut Bölcskei, Pierre Duhamel, and Rima Hleiss


Proc. of IEEE International Conference on Communications (ICC), Vancouver B.C., Canada, Vol. 1, pp. 559-564, June 1999.

DOI: 10.1109/ICC.1999.768001

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Orthogonal frequency division multiplexing (OFDM) is a promising technique for high data-rate transmission over wireless channels. In general, wireless channels are time-frequency dispersive. The performance of wireless OFDM therefore depends critically on the time-frequency localization of the pulse shaping filter used. It has been pointed out in [1] that OFDM systems based on offset QAM (OFDM/OQAM) bypass a major disadvantage of OFDM schemes based on ordinary QAM, namely the fact that well-localized pulse shaping filters are prohibited in the case of a critical time-frequency grid where spectral efficiency is maximal. In this paper, we derive general orthogonality conditions for OFDM/OQAM systems and we propose efficient (FFT-based) design procedures for time-frequency well-localized OFDM/OQAM pulse shaping filters with arbitrary length and arbitrary overlapping factors. Finally, we present design examples.


OFDM, offset QAM, pulse shaping, filter design, filter banks

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