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Permanent link (DOI): https://doi.org/10.7939/R3C01N

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MIMO Relays for Increased Coverage and Capacity in Broadband Cellular Systems Open Access

Descriptions

Other title
Subject/Keyword
wireless
multi-hop
broadband
cellular
relay
MIMO
multihop
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Jacobson, Kevin Robert
Supervisor and department
Krzymien, Witold (Electrical and Computer Engineering)
Examining committee member and department
MacGregor, Mike (Computing Science)
Jing, Yindi (Electrical and Computer Engineering)
Jiang, Hai (Electrical and Computer Engineering)
Fapojuwo, Abraham O. (Electrical and Computer Engineering, University of Calgary)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2010-09-30T21:38:46Z
Graduation date
2010-11
Degree

Degree level
Doctoral
Abstract
A significant challenge for fourth generation cellular systems is the reliable delivery of high speed (up to 1 gigabit per second) data to mobile or nomadic users throughout a cluttered urban environment. The wireless channel is a difficult channel over which to achieve high rate reliable communications. The wireless channel suffers many impairments such as small-scale multipath fading, shadowing, high path loss, co-channel interference, and Doppler shift due to mobility of the terminals and mobility in the propagation environment. Since radio spectrum is a scarce resource it is necessary to build cellular networks with high spectral efficiency. Two promising methods to solve this problem are multihop (MH) relaying and multiple-input multiple-output (MIMO) antenna techniques. The most difficult mobile users to serve reliably are those close to cell edges and those shadowed by large objects such as buildings. With MH relaying, a number of simple and inexpensive wireless relays are deployed throughout the cell to relay transmissions around obstacles and to reduce the path loss to distant mobile users. Also, MH relaying enables the deployment of small subcells throughout the cell, increasing the system's area averaged spectral efficiency. Various MIMO techniques can be used in scattering channels to increase capacity and reliability of data links in a wireless network. MH relaying and MIMO are key inclusions in emerging cellular standards such as IEEE 802.16 and LTE-Advanced, so it is necessary to study how these may be used jointly in a cellular environment. We look at various techniques available in MH relaying and MIMO, and assess the benefits and difficulties of these techniques when used in cellular systems. We put together a realistic cellular system model, with typical cellular topologies and well-accepted propagation models, and assess the performance of a multihop MIMO system. We find that there are tradeoffs in using these techniques jointly since they provide gains by somewhat conflicting methods. MH relaying lowers path loss and mitigates scattering in the channel, while MIMO benefits from significant scattering. As a result, it is necessary to understand how to design a MH-MIMO network carefully in order to maximize the net benefit.
Language
English
DOI
doi:10.7939/R3C01N
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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