Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources

In this thesis, signal propagation variations, that are experience over the frequency resources of IEEE 802.11 Wireless Local Area Networks (WLANs) are studied. It is found that exploitation of these variations can improve several aspects of wireless communication systems. To this aim, frequency var...

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Detalhes bibliográficos
Autor: Nitsche, Thomas
Formato: tesis doctoral
Fecha de publicación:2015
País:España
Recursos:IMDEA Networks Institute
Repositorio:IMDEA Networks Institute Digital Repository
Idioma:inglés
OAI Identifier:oai:dspace.networks.imdea.org:20.500.12761/103
Acesso em linha:http://hdl.handle.net/20.500.12761/103
Access Level:acceso abierto
Palavra-chave:Wireless Networking
Millimeter Wave Communication
MAC Layer Design
Beam Steering
Software Defined Radio
Radiowave Propagation
Wireless PHY-layer
Cross-layer Protocols
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spelling Enhancing Wireless local area Networks by leveraging Diverse Frequency ResourcesNitsche, ThomasWireless NetworkingMillimeter Wave CommunicationMAC Layer DesignBeam SteeringSoftware Defined RadioRadiowave PropagationWireless PHY-layerCross-layer ProtocolsIn this thesis, signal propagation variations, that are experience over the frequency resources of IEEE 802.11 Wireless Local Area Networks (WLANs) are studied. It is found that exploitation of these variations can improve several aspects of wireless communication systems. To this aim, frequency varying behavior is addressed at two different levels. First, the intra-channel scale is considered, i.e. variations over the continuous frequency block that a device uses for a cohesive transmission. Variations at this level are well known but cur- rent wireless systems restrict to basic equalization techniques to balance the received signal. In contrast, this work shows that more fine grained adaptation to these differences can accomplish throughput and connection range gains. Second, multi-frequency band enabled devices that access widely differing frequency re- sources in the millimeter wave range as well as in the microwave range are analyzed. These devices that are expected to follow the IEEE 802.11ad specification experience intense propaga- tion variations over their frequency resources. Thus, a part of this thesis revises, the theoretical specification of the IEEE 802.11ad standard and complements it by a measurement study of first generation millimeter wave devices. This study reveals deficiencies of first generation millime- ter wave systems, whose improvement will pose new challenges to the protocol design of future generation systems. These challenges are than addressed by novel methods that leverage from frequency varying propagation characteristics. The first method, improves the beam training process of millimeter wave networks, that need highly directional, though electronically steered, transmissions to overcome increased free space attenuation. By leveraging from omni-directional signal propagation at the microwave bands, efficient direction interference is utilized to provide information to millimeter wave interfaces and replace brute force direction testing. Second, deafness effects at the millimeter wave band, which impact IEEE 802.11 channel access methods are addressed. As directional communication on these bands complicates sensing the medium to be busy or idle, inefficiencies and unfairness are implied. By using coordination message exchange on the legacy Wi-Fi frequencies with omni- directional communication properties, these effects are countered. The millimeter wave bands can thus unfold their full potential, being exclusively used for high speed data frame transmission.Telematics EngineeringUniversidad Carlos III de Madrid, SpainpubWidmer, Joerg20152015-09-25doctoral thesishttp://purl.org/coar/resource_type/c_db06VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/doctoralThesishttp://hdl.handle.net/20.500.12761/103reponame:IMDEA Networks Institute Digital Repositoryinstname:IMDEA Networks InstituteInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:dspace.networks.imdea.org:20.500.12761/1032026-06-06T12:35:51Z
dc.title.none.fl_str_mv Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
title Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
spellingShingle Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
Nitsche, Thomas
Wireless Networking
Millimeter Wave Communication
MAC Layer Design
Beam Steering
Software Defined Radio
Radiowave Propagation
Wireless PHY-layer
Cross-layer Protocols
title_short Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
title_full Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
title_fullStr Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
title_full_unstemmed Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
title_sort Enhancing Wireless local area Networks by leveraging Diverse Frequency Resources
dc.creator.none.fl_str_mv Nitsche, Thomas
author Nitsche, Thomas
author_facet Nitsche, Thomas
author_role author
dc.contributor.none.fl_str_mv Widmer, Joerg
dc.subject.none.fl_str_mv Wireless Networking
Millimeter Wave Communication
MAC Layer Design
Beam Steering
Software Defined Radio
Radiowave Propagation
Wireless PHY-layer
Cross-layer Protocols
topic Wireless Networking
Millimeter Wave Communication
MAC Layer Design
Beam Steering
Software Defined Radio
Radiowave Propagation
Wireless PHY-layer
Cross-layer Protocols
description In this thesis, signal propagation variations, that are experience over the frequency resources of IEEE 802.11 Wireless Local Area Networks (WLANs) are studied. It is found that exploitation of these variations can improve several aspects of wireless communication systems. To this aim, frequency varying behavior is addressed at two different levels. First, the intra-channel scale is considered, i.e. variations over the continuous frequency block that a device uses for a cohesive transmission. Variations at this level are well known but cur- rent wireless systems restrict to basic equalization techniques to balance the received signal. In contrast, this work shows that more fine grained adaptation to these differences can accomplish throughput and connection range gains. Second, multi-frequency band enabled devices that access widely differing frequency re- sources in the millimeter wave range as well as in the microwave range are analyzed. These devices that are expected to follow the IEEE 802.11ad specification experience intense propaga- tion variations over their frequency resources. Thus, a part of this thesis revises, the theoretical specification of the IEEE 802.11ad standard and complements it by a measurement study of first generation millimeter wave devices. This study reveals deficiencies of first generation millime- ter wave systems, whose improvement will pose new challenges to the protocol design of future generation systems. These challenges are than addressed by novel methods that leverage from frequency varying propagation characteristics. The first method, improves the beam training process of millimeter wave networks, that need highly directional, though electronically steered, transmissions to overcome increased free space attenuation. By leveraging from omni-directional signal propagation at the microwave bands, efficient direction interference is utilized to provide information to millimeter wave interfaces and replace brute force direction testing. Second, deafness effects at the millimeter wave band, which impact IEEE 802.11 channel access methods are addressed. As directional communication on these bands complicates sensing the medium to be busy or idle, inefficiencies and unfairness are implied. By using coordination message exchange on the legacy Wi-Fi frequencies with omni- directional communication properties, these effects are countered. The millimeter wave bands can thus unfold their full potential, being exclusively used for high speed data frame transmission.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-09-25
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12761/103
url http://hdl.handle.net/20.500.12761/103
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:IMDEA Networks Institute Digital Repository
instname:IMDEA Networks Institute
instname_str IMDEA Networks Institute
reponame_str IMDEA Networks Institute Digital Repository
collection IMDEA Networks Institute Digital Repository
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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