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    Interference mitigation in Cognitive Radio based Femtocells

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    Authors
    Kpojime, Harold Orduen
    Safdar, Ghazanfar Ali
    Issue Date
    2014
    Subjects
    cognitive radio
    femtocells
    interference
    long term evolution
    power control
    interference mitigation
    spectrum access
    
    Metadata
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    Abstract
    Femtocell architecture involves the use of two separate layers – the macrocell and femtocell layers. In this architecture, the former is the conventional cellular network whereas the latter incorporates a range of shorter range cells. Femtocells are designed to co-exist alongside macrocells providing spatial frequency reuse, higher spectrum efficiency and cover areas where macrocells cannot. Femtocells positioned in the macrocell considerably improve the indoor coverage and provide better user experience. However, interference between the two layers is imminent; therefore ways to manage it must be employed to efficiently avoid problems such as coverage holes in the macrocells. Essential limits of capacity and attainable data rates also mainly depend on the interference faced by a femtocell network. Recently, Cognitive Radio (CR) which has the ability to sense its environment and accordingly alter its characteristics, e.g. transmission parameters, has been merged with femtocells to exploit the capabilities of the former in the latter. CR enabled femtocells in a two tier network can sense the environment and opportunistically allocate both licensed and unlicensed frequency bands to user equipments to avoid interference. This paper examines interference mitigation in femtocells using CR and provides comprehensive survey of different CR enabled interference mitigation schemes. Presented schemes such as power control, spectrum access, antenna and joint schemes are classified before they are compared for pros and cons. Finally tradeoffs and cost of using CR in femtocells are highlighted with some insight into future research issues and challenges.
    Citation
    Kpojime, H.O., Safdar, G.A.(2014) 'Interference Mitigation in Cognitive Radio based Femtocells', Communications Surveys & Tutorials, IEEE , PP (99): 1
    Publisher
    IEEE
    Journal
    IEEE Communications Surveys & Tutorials
    URI
    http://hdl.handle.net/10547/336089
    DOI
    10.1109/COMST.2014.2361687
    Additional Links
    http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6919262
    Type
    Article
    Language
    en
    ISSN
    1553-877X
    ae974a485f413a2113503eed53cd6c53
    10.1109/COMST.2014.2361687
    Scopus Count
    Collections
    Centre for Wireless Research (CWR)

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