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Title: On full duplex wireless networks : PHY, MAC and network layers perspective
Author: Al Kadri, Mhd Omar
ISNI:       0000 0004 6421 5051
Awarding Body: King's College London
Current Institution: King's College London (University of London)
Date of Award: 2017
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In conventional half-duplex (HD) wireless communications systems, bidirectional communications between a pair of nodes is achieved with either frequency division duplexing (FDD) or time division duplexing (TDD). The former technique employs different frequency bands for the uplink (UL) and downlink (DL), whereas, in the latter technique, a single channel is shared in the time domain for both UL and DL. Such techniques however may not be suitable to fulfil the envisioned requirements of next generation wireless systems. Historically, simultaneous transmission and reception in wireless communications was deemed infeasible in practice due to the so called self-interference (SI), which is the interference generated by the transmitter of a radio on its own receiver. Recent developments in SI cancellation techniques have led to the practical realization of FD radios. FD technology has a number of attractive features, for example, it can potentially double (theoretically) the ergodic capacity, reduce the feedback delay, decrease the end-to-end delay, improve the network secrecy and increase the efficiency of network protocols. Motivated by these developments,first in this study, a two-tier heterogeneous cellular networks (HCNs) wherein the first tier comprises half-duplex (HD) macro base stations (BSs) and the second tier consists of FD small cells. Advocating for the use of small cells as a strong candidate to deploy FD technology, for its low-powered nature and ease of deployment. The study is conducted through a stochastic geometry approach, we characterize and derive the closed-form expressions for the outage probability and the rate coverage. Furthermore, we move up the layers of the protocol stack and present an energy-effcient medium access control (MAC) protocol for distributed full-duplex (FD) wireless network, termed as Energy-FDM. The key aspects of the Energy-FDM include energy-effciency, co-existence of distinct types of FD links, throughput improvement, and backward comparability with conventional half-duplex (HD) nodes. Finally, we present a cross-layer aided routing protocol, termed as X-FDR, for multi-hop FD wireless networks. X-FDR exploits a Physical (PHY) layer model capturing imperfection of SI cancellation. At the medium access control (MAC) layer, X-FDR adopts an optimized MAC protocol which implements a power control mechanism without creating the hidden terminal problem. X-FDR exploits the unique characteristics of FD technology at the network layer to construct energy-efficient and low latency routes in the network.
Supervisor: Nallanathan, Arumugam ; Friderikos, Vasilis Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available