Opportunistic interference cancelation and user selection in cognitive multiple access network

Behrouz Maham*, Petar Popovski, Xiangyun Zhou

*Corresponding author for this work

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

    7 Citations (Scopus)

    Abstract

    This paper investigates the problem of spectrally efficient operation of a multi-user uplink cognitive radio system in the presence of a single primary link. The secondary system applies opportunistic interference cancelation (OIC) and decode the primary signal when such an opportunity is created. We derive the achievable rate in the secondary system when OIC is used. This scheme has a practical significance, since it enables rate adaptation without requiring any action from the primary system. The approximated formulas and tight lower and upper bounds for the ergodic sum-rate capacity of the secondary network are found. Next, the power allocation is investigated in the secondary system for maximizing the sum-rate under an interference constraint at the primary system and it is shown that the optimal solution leads to a opportunistic user selection strategy. We propose a simple user selection strategy combined with OIC which achieves the optimal capacity given an interference constraint at the primary system. Finally, the analytical results are confirmed by simulations, indicating the fact that the low-complexity, spectral-efficient, flexible, and high-performing cognitive radio can be designed based on the proposed scheme.

    Original languageEnglish
    Title of host publication2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
    Pages174-178
    Number of pages5
    DOIs
    Publication statusPublished - 2012
    Event2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012 - Cesme, Turkey
    Duration: 17 Jun 201220 Jun 2012

    Publication series

    NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

    Conference

    Conference2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
    Country/TerritoryTurkey
    CityCesme
    Period17/06/1220/06/12

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