{"id":{"repo_id":"ohiolink","oai_identifier":"oai:etd.ohiolink.edu:akron1363180310"},"canonical_url":"https://search.dev.ndltd.org/etd/ohiolink/oai:etd.ohiolink.edu:akron1363180310","repository":{"repo_id":"ohiolink","name":"OhioLINK","base_url":"https://etd.ohiolink.edu/acprod/odb_etd/ws/oai/oai"},"display":{"title":"Precoder Design for Cooperative Cognitive Radio Systems","abstract":"Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at each of the source, relay and destination nodes of the secondary system, and the other with a single secondary relay node with multiple antennas at each of the source, relay and destination nodes of the secondary system. In particular, an amplify-and-forward (AF) relaying secondary system is considered that operates in the presence of a primary system. For the first scenario, the joint relay and power allocation problem is studied under power constraints at the source and the relay of the secondary system and the interference constraint from the secondary source and relay to the primary users (PUs). An optimal relay selection and power allocation scheme is first proposed. Since the proposed scheme requires an exhaustive search over all candidate relay nodes, to reduce complexity, a non-exhaustive sub-optimal search method is also proposed with performance near to that of the optimal scheme.In the second scenario, the problem of relay and source precoder design in a multi-antenna non-regenerative relaying CR system is studied assuming underlay spectrum sharing methodology with the PUs. The optimal structure of the relay and source precodering matrices are derived for the cases of dominant power and dominant interference constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of relay and source precoding matrices.Simulation results for different scenarios show that the proposed schemes significantly improve the performance in terms of the achievable throughput.","abstract_html":"Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at each of the source, relay and destination nodes of the secondary system, and the other with a single secondary relay node with multiple antennas at each of the source, relay and destination nodes of the secondary system. In particular, an amplify-and-forward (AF) relaying secondary system is considered that operates in the presence of a primary system. For the first scenario, the joint relay and power allocation problem is studied under power constraints at the source and the relay of the secondary system and the interference constraint from the secondary source and relay to the primary users (PUs). An optimal relay selection and power allocation scheme is first proposed. Since the proposed scheme requires an exhaustive search over all candidate relay nodes, to reduce complexity, a non-exhaustive sub-optimal search method is also proposed with performance near to that of the optimal scheme.In the second scenario, the problem of relay and source precoder design in a multi-antenna non-regenerative relaying CR system is studied assuming underlay spectrum sharing methodology with the PUs. The optimal structure of the relay and source precodering matrices are derived for the cases of dominant power and dominant interference constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of relay and source precoding matrices.Simulation results for different scenarios show that the proposed schemes significantly improve the performance in terms of the achievable throughput.","abstract_has_math":false,"creators":["Budhathoki, Krishna Ram"],"institution":"University of Akron","degree_name":"Master of Science in Engineering","degree_level":"masters","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Bahrami, Hamid Reza"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-05-21","date_published":"2013-05-21","updated_at":"2026-07-24T03:36:39Z","subjects":["Electrical Engineering","cognitive radio","multi-input multi-output (MIMO)","non-regenerative relaying","capacity","precoder design"],"languages":["English"],"rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bahrami, Hamid Reza"]},{"key":"dc:creator","label":"Author","values":["Budhathoki, Krishna Ram"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2013-05-21"]},{"key":"dc:publisher","label":"Institution","values":["University of Akron / OhioLINK"]},{"key":"dc:type","label":"Dc Type","values":["Electronic Thesis or Dissertation"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Engineering"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Akron"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Electrical Engineering","cognitive radio","multi-input multi-output (MIMO)","non-regenerative relaying","capacity","precoder design"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at each of the source, relay and destination nodes of the secondary system, and the other with a single secondary relay node with multiple antennas at each of the source, relay and destination nodes of the secondary system. In particular, an amplify-and-forward (AF) relaying secondary system is considered that operates in the presence of a primary system. For the first scenario, the joint relay and power allocation problem is studied under power constraints at the source and the relay of the secondary system and the interference constraint from the secondary source and relay to the primary users (PUs). An optimal relay selection and power allocation scheme is first proposed. Since the proposed scheme requires an exhaustive search over all candidate relay nodes, to reduce complexity, a non-exhaustive sub-optimal search method is also proposed with performance near to that of the optimal scheme.In the second scenario, the problem of relay and source precoder design in a multi-antenna non-regenerative relaying CR system is studied assuming underlay spectrum sharing methodology with the PUs. The optimal structure of the relay and source precodering matrices are derived for the cases of dominant power and dominant interference constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of relay and source precoding matrices.Simulation results for different scenarios show that the proposed schemes significantly improve the performance in terms of the achievable throughput."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf","p.79","364.1 KB"]},{"key":"dc:title","label":"Title","values":["Precoder Design for Cooperative Cognitive Radio Systems"]}]}],"canonical_facts":{"dc:contributor":["Bahrami, Hamid Reza"],"dc:creator":["Budhathoki, Krishna Ram"],"dc:date":["2013-05-21"],"dc:description":["Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at each of the source, relay and destination nodes of the secondary system, and the other with a single secondary relay node with multiple antennas at each of the source, relay and destination nodes of the secondary system. In particular, an amplify-and-forward (AF) relaying secondary system is considered that operates in the presence of a primary system. For the first scenario, the joint relay and power allocation problem is studied under power constraints at the source and the relay of the secondary system and the interference constraint from the secondary source and relay to the primary users (PUs). An optimal relay selection and power allocation scheme is first proposed. Since the proposed scheme requires an exhaustive search over all candidate relay nodes, to reduce complexity, a non-exhaustive sub-optimal search method is also proposed with performance near to that of the optimal scheme.In the second scenario, the problem of relay and source precoder design in a multi-antenna non-regenerative relaying CR system is studied assuming underlay spectrum sharing methodology with the PUs. The optimal structure of the relay and source precodering matrices are derived for the cases of dominant power and dominant interference constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of relay and source precoding matrices.Simulation results for different scenarios show that the proposed schemes significantly improve the performance in terms of the achievable throughput."],"dc:format":["application/pdf","p.79","364.1 KB"],"dc:identifier":["http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310"],"dc:language":["English"],"dc:publisher":["University of Akron / OhioLINK"],"dc:rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"dc:subject":["Electrical Engineering","cognitive radio","multi-input multi-output (MIMO)","non-regenerative relaying","capacity","precoder design"],"dc:title":["Precoder Design for Cooperative Cognitive Radio Systems"],"dc:type":["Electronic Thesis or Dissertation"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science in Engineering"],"thesis:institution_name":["University of Akron"]},"updated_at":"2026-07-24T03:36:39Z"}