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    Full-Duplex Communications in Large-Scale Cellular Networks

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    Final MS Thesis_Ahmad Alammouri.pdf
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    Final Thesis_Ahmad Alammouri
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    Type
    Thesis
    Authors
    Alammouri, Ahmad cc
    Advisors
    Alouini, Mohamed-Slim cc
    Committee members
    Shamma, Jeff S. cc
    Al-Naffouri, Tareq Y. cc
    Sultan Salem, Ahmed Kamal
    Ghanem, Bernard cc
    Program
    Electrical and Computer Engineering
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Date
    2016-04
    Permanent link to this record
    http://hdl.handle.net/10754/608640
    
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    Abstract
    In-band full-duplex (FD) communications have been optimistically promoted to improve the spectrum utilization and efficiency. However, the penetration of FD communications to the cellular networks domain is challenging due to the imposed uplink/downlink interference. This thesis presents a tractable framework, based on stochastic geometry, to study FD communications in multi-tier cellular networks. Particularly, we assess the FD communications effect on the network performance and quantify the associated gains. The study proves the vulnerability of the uplink to the downlink interference and shows that the improved FD rate gains harvested in the downlink (up to 97%) comes at the expense of a significant degradation in the uplink rate (up to 94%). Therefore, we propose a novel fine-grained duplexing scheme, denoted as α-duplex scheme, which allows a partial overlap between the uplink and the downlink frequency bands. We derive the required conditions to harvest rate gains from the α-duplex scheme and show its superiority to both the FD and half-duplex (HD) schemes. In particular, we show that the α-duplex scheme provides a simultaneous improvement of 28% for the downlink rate and 56% for the uplink rate. We also show that the amount of the overlap can be optimized based on the network design objective. Moreover, backward compatibility is an essential ingredient for the success of new technologies. In the context of in-band FD communication, FD base stations (BSs) should support HD users' equipment (UEs) without sacrificing the foreseen FD gains. The results show that FD-UEs are not necessarily required to harvest rate gains from FD-BSs. In particular, the results show that adding FD-UEs to FD-BSs offers a maximum of 5% rate gain over FD-BSs and HD-UEs case, which is a marginal gain compared to the burden required to implement FD transceivers at the UEs' side. To this end, we shed light on practical scenarios where HD-UEs operation with FD-BSs outperforms the operation when both the BSs and UEs are FD and we find a closed form expression for the critical value of the self-interference cancellation power required for the FD UEs to outperform HD UEs.
    Citation
    Alammouri, A. (2016). Full-Duplex Communications in Large-Scale Cellular Networks. KAUST Research Repository. https://doi.org/10.25781/KAUST-5DY16
    DOI
    10.25781/KAUST-5DY16
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-5DY16
    Scopus Count
    Collections
    MS Theses; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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