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    SPECTRUM MANAGEMENT FOR FUTURE GENERATIONS OF CELLULAR NETWORKS

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    Name:
    Itsikiantsoa_PhD_Thesis.pdf
    Size:
    2.989Mb
    Format:
    PDF
    Description:
    Final thesis
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    Type
    Dissertation
    Authors
    Randrianantenaina, Itsikiantsoa cc
    Advisors
    Alouini, Mohamed-Slim cc
    Committee members
    Alouini, Mohamed-Slim cc
    Ghanem, Bernard cc
    Shihada, Basem cc
    Dahrouj, Hayssam cc
    Bennis, Mehdi
    Program
    Electrical Engineering
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2019-08
    Permanent link to this record
    http://hdl.handle.net/10754/656380
    
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    Abstract
    The demand for wireless communication is ceaselessly increasing in terms of the number of subscribers and services. Future generations of cellular networks are expected to allow not only humans but also machines to be immersively connected. However, the radio frequency spectrum is already fully allocated. Therefore, developing techniques to increase spectrum efficiency has become necessary. This dissertation analyzes two spectrum sharing techniques that enable efficient utilization of the available radio resources in cellular networks. The first technique, called full-duplex (FD) communication, uses the same spectrum to transmit and receive simultaneously. Using stochastic geometry tools, we derive a closed-form expression of an upper-bound for the maximum achievable uplink ergodic rate in FD cellular networks. We show that the uplink transmission is vulnerable to the new interference introduced by FD communications (interference from the downlink transmission in other cells), especially when the disparity in transmission power between the uplink and downlink is considerable. We further show that adjusting the uplink transmission power according to the interference power level and the channel gain can improve the uplink performance in full-duplex cellular networks. Moreover, we propose an interference management technique that allows a flexible overlap between the spectra occupied by the downlink and uplink transmissions. The flexible overlap is optimized along with the user-to-base station association, the power allocation and the channel allocation in order to maximize a network-wide utility function. The second spectrum sharing technique, called non-orthogonal multiple access (NOMA), allows a transmitter to communicate with multiple receivers through the same frequency-time resource unit. We analyze the implementation of such a scheme in the downlink of cellular networks, more precisely, in the downlink of fog radio access networks (FogRANs). FogRAN is a network architecture that takes full advantage of the edge devices capability to process and store data. We propose managing the interference for NOMA-based FogRAN to improve the network performance by jointly optimizing user scheduling, the power allocated to each resource block and the division of power between the multiplexed users. The simulation results show that significant performance gains can be achieved through proper resource allocation with both studied spectrum sharing techniques.
    Citation
    Randrianantenaina, I. (2019). SPECTRUM MANAGEMENT FOR FUTURE GENERATIONS OF CELLULAR NETWORKS. KAUST Research Repository. https://doi.org/10.25781/KAUST-76MO4
    DOI
    10.25781/KAUST-76MO4
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-76MO4
    Scopus Count
    Collections
    Dissertations; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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