An Efficient FFT For OFDM Based Cognitive Radio On A Reconfigurable Architecture

Qiwei Zhang, André B.J. Kokkeler, Gerard J.M. Smit

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    33 Citations (Scopus)
    250 Downloads (Pure)


    Cognitive Radio is a promising technology to utilize non-used parts of the spectrum that actually are assigned to licensed services. An adaptive OFDM based Cognitive Radio system has the capacity to nullify individual carriers to avoid interference to the licensed user. Therefore, there could be a considerably large number of zero-valued inputs/outputs for the IFFT/FFT in the OFDM transceiver. Due to the wasted operations on zero values, the standard FFT is no longer efficient. Based on this observation, we propose to use a computationally efficient IFFT/FFT as an option for OFDM based Cognitive Radio. Mapping this algorithm onto a reconfigurable architecture is discussed.
    Original languageEnglish
    Title of host publicationIEEE International Conference on Communications 2007 Cognet Workshop
    Place of PublicationPiscataway, NJ
    Number of pages5
    ISBN (Print)1-4244-0353-7
    Publication statusPublished - 24 Jun 2007
    EventFirst IEEE CogNet Workshop, CogNet@ICC 2007: Towards Cognition in Wireless Networks - Glasgow, United Kingdom
    Duration: 24 Jun 200724 Jun 2007
    Conference number: 1


    ConferenceFirst IEEE CogNet Workshop, CogNet@ICC 2007
    Abbreviated titleCogNet@ICC
    Country/TerritoryUnited Kingdom


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