Hybrid overload MC-CDMA for Cognitive Radio networks

Fahimeh Jasbi, Daniel K C So

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


    This paper proposes the use of an overloaded hybrid MC-CDMA system to improve the spectral efficiency of Cognitive Radio (CR) network. The overlay transmission in the unused parts of the spectrum is full-loaded MC-CDMA signals with scrambling. The underlay signal, using a separate scrambling code from the overlay signals, utilizes the whole spectrum taking into account of the interference threshold of the Primary User (PU). On the receiver side, chip-level MMSE is used for overlay detection, interference reconstruction and cancellation. Symbollevel MMSE is then used to detect the underlay. Since overlay is performing chip-level equalization and data detection, there is no need for other users' signatures. Therefore, the proposed system does not add complexity to the overlay system in comparison with the conventional MMSE receivers. Simulation results show that the underlay transmission does not affect the overlay performance while achieving good performance for different PU occupancy levels. It is also shown that it is less sensitive to PU interference level and significantly outperforms previous methods. © 2014 IEEE.
    Original languageEnglish
    Title of host publication2014 IEEE International Conference on Communications, ICC 2014|IEEE Int. Conf. Commun., ICC
    PublisherIEEE Computer Society
    Number of pages5
    ISBN (Print)9781479920037
    Publication statusPublished - 2014
    Event2014 1st IEEE International Conference on Communications, ICC 2014 - Sydney, NSW
    Duration: 1 Jul 2014 → …


    Conference2014 1st IEEE International Conference on Communications, ICC 2014
    CitySydney, NSW
    Period1/07/14 → …


    • Cognitive Radio (CR)
    • Multi-Carrier Code Division Multiple Access (MC-CDMA)
    • Orthogonal Frequency Division Multiplexing (OFDM)


    Dive into the research topics of 'Hybrid overload MC-CDMA for Cognitive Radio networks'. Together they form a unique fingerprint.

    Cite this