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    Joint multiuser switched diversity and adaptive modulation schemes for spectrum sharing systems

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    Type
    Conference Paper
    Authors
    Qaraqe, Marwa
    Abdallah, Mohamed M.
    Serpedin, Erchin
    Alouini, Mohamed-Slim cc
    Alnuweiri, Hussein M.
    KAUST Department
    Electrical Engineering Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Communication Theory Lab
    Date
    2012-12
    Permanent link to this record
    http://hdl.handle.net/10754/564640
    
    Metadata
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    Abstract
    In this paper, we develop multiuser access schemes for spectrum sharing systems whereby secondary users are allowed to share the spectrum with primary users under the condition that the interference observed at the primary receiver is below a predetermined threshold. In particular, we devise two schemes for selecting a user among those that satisfy the interference constraint and achieve an acceptable signal-to-noise ratio level. The first scheme selects the user that reports the best channel quality. In order to alleviate the high feedback load associated with the first scheme, we develop a second scheme based on the concept of switched diversity where the base station scans the users in a sequential manner until an acceptable user is found. In addition to these two selection schemes, we consider two power adaptive settings at the secondary users based on the amount of interference available at the secondary transmitter. In the On/Off power setting, users are allowed to transmit based on whether the interference constraint is met or not, while in the full power adaptive setting, the users are allowed to vary their transmission power to satisfy the interference constraint. Finally, we present numerical results for our proposed algorithms where we show the trade-off between the average spectral efficiency and average feedback load for both schemes. © 2012 IEEE.
    Citation
    Qaraqe, M., Abdallah, M., Serpedin, E., Alouini, M.-S., & Alnuweiri, H. (2012). Joint multiuser switched diversity and adaptive modulation schemes for spectrum sharing systems. 2012 IEEE Global Communications Conference (GLOBECOM). doi:10.1109/glocom.2012.6503278
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    2012 IEEE Global Communications Conference (GLOBECOM)
    Conference/Event name
    2012 IEEE Global Communications Conference, GLOBECOM 2012
    ISBN
    9781467309219
    DOI
    10.1109/GLOCOM.2012.6503278
    ae974a485f413a2113503eed53cd6c53
    10.1109/GLOCOM.2012.6503278
    Scopus Count
    Collections
    Conference Papers; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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