{"id":{"repo_id":"kings","oai_identifier":"oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"},"canonical_url":"https://search.dev.ndltd.org/etd/kings/oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a","repository":{"repo_id":"kings","name":"King's College London","base_url":"https://kclpure.kcl.ac.uk/ws/oai"},"display":{"title":"Relay Diversity Techniques for OFDM and MC-CDMA","abstract":"The future of mobile and personal communications requires a system
that can support a large number of users and has the ability to provide
high-speed services. Meeting this demand is challenging since wireless
communications are subject to these four major constraints: complex
fading channels, a scarce usable radio spectrum, and limitations on
the power and size of the mobile terminals. Space-time codes, such
as the Alamouti/space-time block coding (STBC) and cyclic delay
diversity (CDD) can provide diversity and coding gains in multipleinput
multiple-output (MIMO) systems over fading channels.
However in an ad-hoc network, nodes are often constrained in hardware
complexity and size, which makes MIMO systems impractical for
certain applications. Cooperative relay diversity schemes have been
introduced in an eort to overcome these limitations. Cooperative
techniques allow a collection of communication nodes to cooperate
with to relay signals amongst each other, eectively creating a virtual
antenna array, which combat multipath fading in wireless channels.
This thesis investigates relay diversity techniques in cooperative communications,
namely the distributed space-time block coding (DSTBC)
and relay cyclic delay diversity (RCDD) for OFDM and MC-CDMA
systems. The performance analysis of the wireless relay networks under
dierent protocols and fading channels are investigated. We derived
the formulas for the symbol error rate (SER) of the investigated
schemes in fading channels.
Finally, a novel hybrid relay diversity (HRD) is presented for OFDMbased
system. This new relay structure addresses the issue of achieving
a full spatial and multipath diversity by developing a hybrid for
CDD and STBC. Simulation on the system performance of HRD
shows the superiority of the technique compared to standalone DSTBC
and RCDD.","abstract_html":"The future of mobile and personal communications requires a system<br/>that can support a large number of users and has the ability to provide<br/>high-speed services. Meeting this demand is challenging since wireless<br/>communications are subject to these four major constraints: complex<br/>fading channels, a scarce usable radio spectrum, and limitations on<br/>the power and size of the mobile terminals. Space-time codes, such<br/>as the Alamouti/space-time block coding (STBC) and cyclic delay<br/>diversity (CDD) can provide diversity and coding gains in multipleinput<br/>multiple-output (MIMO) systems over fading channels.<br/>However in an ad-hoc network, nodes are often constrained in hardware<br/>complexity and size, which makes MIMO systems impractical for<br/>certain applications. Cooperative relay diversity schemes have been<br/>introduced in an eort to overcome these limitations. Cooperative<br/>techniques allow a collection of communication nodes to cooperate<br/>with to relay signals amongst each other, eectively creating a virtual<br/>antenna array, which combat multipath fading in wireless channels.<br/>This thesis investigates relay diversity techniques in cooperative communications,<br/>namely the distributed space-time block coding (DSTBC)<br/>and relay cyclic delay diversity (RCDD) for OFDM and MC-CDMA<br/>systems. The performance analysis of the wireless relay networks under<br/>dierent protocols and fading channels are investigated. We derived<br/>the formulas for the symbol error rate (SER) of the investigated<br/>schemes in fading channels.<br/>Finally, a novel hybrid relay diversity (HRD) is presented for OFDMbased<br/>system. This new relay structure addresses the issue of achieving<br/>a full spatial and multipath diversity by developing a hybrid for<br/>CDD and STBC. Simulation on the system performance of HRD<br/>shows the superiority of the technique compared to standalone DSTBC<br/>and RCDD.","abstract_has_math":false,"creators":["Abdul Razak, Nur Idora"],"institution":"King's College London","degree_name":"Doctor of Philosophy","degree_level":"Doctoral Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Said, Fatin","Aghvami, Abdol-Hamid"],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-12-1","date_published":"2012-12-1","updated_at":"2026-07-24T02:44:31Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"],"render_values":[{"text":"oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a","href":null,"code":true}]}]},"links":{"outbound_url":"https://kclpure.kcl.ac.uk/portal/en/studentTheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Said, Fatin","Aghvami, Abdol-Hamid"]},{"key":"dc:creator","label":"Author","values":["Abdul Razak, Nur Idora"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-12-1"]},{"key":"dc:date.issued","label":"Date","values":["2012-12-1"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Informatics"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["King's College London"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://kclpure.kcl.ac.uk/portal/en/studentTheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral Thesis"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctor of Philosophy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a","https://kclpure.kcl.ac.uk/portal/en/studentTheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://kclpure.kcl.ac.uk/portal/files/12365101/Studentthesis-Nur%20Idora_Abdul%20Razak_2012.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The future of mobile and personal communications requires a system
that can support a large number of users and has the ability to provide
high-speed services. Meeting this demand is challenging since wireless
communications are subject to these four major constraints: complex
fading channels, a scarce usable radio spectrum, and limitations on
the power and size of the mobile terminals. Space-time codes, such
as the Alamouti/space-time block coding (STBC) and cyclic delay
diversity (CDD) can provide diversity and coding gains in multipleinput
multiple-output (MIMO) systems over fading channels.
However in an ad-hoc network, nodes are often constrained in hardware
complexity and size, which makes MIMO systems impractical for
certain applications. Cooperative relay diversity schemes have been
introduced in an eort to overcome these limitations. Cooperative
techniques allow a collection of communication nodes to cooperate
with to relay signals amongst each other, eectively creating a virtual
antenna array, which combat multipath fading in wireless channels.
This thesis investigates relay diversity techniques in cooperative communications,
namely the distributed space-time block coding (DSTBC)
and relay cyclic delay diversity (RCDD) for OFDM and MC-CDMA
systems. The performance analysis of the wireless relay networks under
dierent protocols and fading channels are investigated. We derived
the formulas for the symbol error rate (SER) of the investigated
schemes in fading channels.
Finally, a novel hybrid relay diversity (HRD) is presented for OFDMbased
system. This new relay structure addresses the issue of achieving
a full spatial and multipath diversity by developing a hybrid for
CDD and STBC. Simulation on the system performance of HRD
shows the superiority of the technique compared to standalone DSTBC
and RCDD."]},{"key":"dc:title","label":"Title","values":["Relay Diversity Techniques for OFDM and MC-CDMA"]}]}],"canonical_facts":{"dc:contributor.advisor":["Said, Fatin","Aghvami, Abdol-Hamid"],"dc:creator":["Abdul Razak, Nur Idora"],"dc:date":["2012-12-1"],"dc:date.issued":["2012-12-1"],"dc:description.abstract":["The future of mobile and personal communications requires a system
that can support a large number of users and has the ability to provide
high-speed services. Meeting this demand is challenging since wireless
communications are subject to these four major constraints: complex
fading channels, a scarce usable radio spectrum, and limitations on
the power and size of the mobile terminals. Space-time codes, such
as the Alamouti/space-time block coding (STBC) and cyclic delay
diversity (CDD) can provide diversity and coding gains in multipleinput
multiple-output (MIMO) systems over fading channels.
However in an ad-hoc network, nodes are often constrained in hardware
complexity and size, which makes MIMO systems impractical for
certain applications. Cooperative relay diversity schemes have been
introduced in an eort to overcome these limitations. Cooperative
techniques allow a collection of communication nodes to cooperate
with to relay signals amongst each other, eectively creating a virtual
antenna array, which combat multipath fading in wireless channels.
This thesis investigates relay diversity techniques in cooperative communications,
namely the distributed space-time block coding (DSTBC)
and relay cyclic delay diversity (RCDD) for OFDM and MC-CDMA
systems. The performance analysis of the wireless relay networks under
dierent protocols and fading channels are investigated. We derived
the formulas for the symbol error rate (SER) of the investigated
schemes in fading channels.
Finally, a novel hybrid relay diversity (HRD) is presented for OFDMbased
system. This new relay structure addresses the issue of achieving
a full spatial and multipath diversity by developing a hybrid for
CDD and STBC. Simulation on the system performance of HRD
shows the superiority of the technique compared to standalone DSTBC
and RCDD."],"dc:identifier":["oai:kclpure.kcl.ac.uk:studenttheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a","https://kclpure.kcl.ac.uk/portal/en/studentTheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"],"dc:identifier.uri":["https://kclpure.kcl.ac.uk/portal/files/12365101/Studentthesis-Nur%20Idora_Abdul%20Razak_2012.pdf"],"dc:language":["eng"],"dc:publisher.department":["Informatics"],"dc:publisher.institution":["King's College London"],"dc:relation.isreferencedby":["https://kclpure.kcl.ac.uk/portal/en/studentTheses/7aff62f9-7af4-47f5-b4bc-d91377988f5a"],"dc:title":["Relay Diversity Techniques for OFDM and MC-CDMA"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["Doctoral Thesis"],"dc:type.qualificationname":["Doctor of Philosophy"]},"updated_at":"2026-07-24T02:44:31Z"}