Combined spectrum pooling and adaptive bit loading for cognitive radio ofdm based system

I Budiarjo, H Nikookar, LP Ligthart

    Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

    17 Citations (Scopus)


    This paper presents the combination of adaptive bit loading and spectrum pooling to be applied in a Cognitive Radio system. Adaptive bit loading is a method to adapt the constellation size of the transmitted signal according to the channel variations by exclusion of heavily faded carriers from transmission and as a compensation higher modulation modes are allocated to subcarriers with good SNR. Windowing of OFDM signal is a spectrum pooling method for shaping the signal spectrumin order to reduce interference to neighbouring system ( legacy users). In this paper different OFDM adaptive bit loading algorithms are combined with serval window funtions, and the bit error rate performance of the system is simulated for a wide sense stationary uncorrelated scattering (WSSUS) mobile mutlipath channel. The new results of this paper show how promising is the combination of bit loading algorithm and window form.
    Original languageUndefined/Unknown
    Title of host publicationProceedings IEEE SCVT 2006
    Editors s.n.
    Place of PublicationLiege, Belgium
    PublisherIEEE Society
    Number of pages4
    ISBN (Print)0780397851
    Publication statusPublished - 2006
    EventIEEE SCVT 2006 - Liege, Belgium
    Duration: 23 Nov 2006 → …

    Publication series



    ConferenceIEEE SCVT 2006
    Period23/11/06 → …


    • conference contrib. refereed
    • Conf.proc. > 3 pag

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