{"id":"https://openalex.org/W2908882174","doi":"https://doi.org/10.1109/twc.2018.2890474","title":"Weighted Sum-Rate Maximization for the Ultra-Dense User-Centric TDD C-RAN Downlink Relying on Imperfect CSI","display_name":"Weighted Sum-Rate Maximization for the Ultra-Dense User-Centric TDD C-RAN Downlink Relying on Imperfect CSI","publication_year":2019,"publication_date":"2019-01-09","ids":{"openalex":"https://openalex.org/W2908882174","doi":"https://doi.org/10.1109/twc.2018.2890474","mag":"2908882174"},"language":"en","primary_location":{"id":"doi:10.1109/twc.2018.2890474","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2018.2890474","pdf_url":null,"source":{"id":"https://openalex.org/S63459445","display_name":"IEEE Transactions on Wireless Communications","issn_l":"1536-1276","issn":["1536-1276","1558-2248"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Wireless Communications","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5075696071","display_name":"Cunhua Pan","orcid":"https://orcid.org/0000-0001-5286-7958"},"institutions":[{"id":"https://openalex.org/I166337079","display_name":"Queen Mary University of London","ror":"https://ror.org/026zzn846","country_code":"GB","type":"education","lineage":["https://openalex.org/I124357947","https://openalex.org/I166337079"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Cunhua Pan","raw_affiliation_strings":["School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K"],"affiliations":[{"raw_affiliation_string":"School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K","institution_ids":["https://openalex.org/I166337079"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5113433956","display_name":"Hong Ren","orcid":"https://orcid.org/0000-0002-3477-1087"},"institutions":[{"id":"https://openalex.org/I76569877","display_name":"Southeast University","ror":"https://ror.org/04ct4d772","country_code":"CN","type":"education","lineage":["https://openalex.org/I76569877"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Hong Ren","raw_affiliation_strings":["Southeast University, Nanjing, China"],"affiliations":[{"raw_affiliation_string":"Southeast University, Nanjing, China","institution_ids":["https://openalex.org/I76569877"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5015335741","display_name":"Maged Elkashlan","orcid":"https://orcid.org/0000-0002-5168-0160"},"institutions":[{"id":"https://openalex.org/I166337079","display_name":"Queen Mary University of London","ror":"https://ror.org/026zzn846","country_code":"GB","type":"education","lineage":["https://openalex.org/I124357947","https://openalex.org/I166337079"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Maged Elkashlan","raw_affiliation_strings":["School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K"],"affiliations":[{"raw_affiliation_string":"School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K","institution_ids":["https://openalex.org/I166337079"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5002265731","display_name":"Arumugam Nallanathan","orcid":"https://orcid.org/0000-0001-8337-5884"},"institutions":[{"id":"https://openalex.org/I166337079","display_name":"Queen Mary University of London","ror":"https://ror.org/026zzn846","country_code":"GB","type":"education","lineage":["https://openalex.org/I124357947","https://openalex.org/I166337079"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Arumugam Nallanathan","raw_affiliation_strings":["School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K"],"affiliations":[{"raw_affiliation_string":"School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K","institution_ids":["https://openalex.org/I166337079"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5091122305","display_name":"Lajos Hanzo","orcid":"https://orcid.org/0000-0002-2636-5214"},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Lajos Hanzo","raw_affiliation_strings":["School of Electronics and Computer Science, The University of Southampton, Southampton, U.K"],"affiliations":[{"raw_affiliation_string":"School of Electronics and Computer Science, The University of Southampton, Southampton, U.K","institution_ids":[]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5075696071"],"corresponding_institution_ids":["https://openalex.org/I166337079"],"apc_list":null,"apc_paid":null,"fwci":3.4971,"has_fulltext":false,"cited_by_count":48,"citation_normalized_percentile":{"value":0.93027837,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":96,"max":99},"biblio":{"volume":"18","issue":"2","first_page":"1182","last_page":"1198"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10936","display_name":"Millimeter-Wave Propagation and Modeling","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11458","display_name":"Advanced Wireless Communication Technologies","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6741795539855957},{"id":"https://openalex.org/keywords/telecommunications-link","display_name":"Telecommunications link","score":0.6174626350402832},{"id":"https://openalex.org/keywords/cluster-analysis","display_name":"Cluster analysis","score":0.565544068813324},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.5573700666427612},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.536659836769104},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.46896636486053467},{"id":"https://openalex.org/keywords/maximization","display_name":"Maximization","score":0.45959600806236267},{"id":"https://openalex.org/keywords/computational-complexity-theory","display_name":"Computational complexity theory","score":0.451028972864151},{"id":"https://openalex.org/keywords/overhead","display_name":"Overhead (engineering)","score":0.4349818229675293},{"id":"https://openalex.org/keywords/benchmark","display_name":"Benchmark (surveying)","score":0.4251595139503479},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.355840265750885},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.27589690685272217}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6741795539855957},{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.6174626350402832},{"id":"https://openalex.org/C73555534","wikidata":"https://www.wikidata.org/wiki/Q622825","display_name":"Cluster analysis","level":2,"score":0.565544068813324},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.5573700666427612},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.536659836769104},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.46896636486053467},{"id":"https://openalex.org/C2776330181","wikidata":"https://www.wikidata.org/wiki/Q18358244","display_name":"Maximization","level":2,"score":0.45959600806236267},{"id":"https://openalex.org/C179799912","wikidata":"https://www.wikidata.org/wiki/Q205084","display_name":"Computational complexity theory","level":2,"score":0.451028972864151},{"id":"https://openalex.org/C2779960059","wikidata":"https://www.wikidata.org/wiki/Q7113681","display_name":"Overhead (engineering)","level":2,"score":0.4349818229675293},{"id":"https://openalex.org/C185798385","wikidata":"https://www.wikidata.org/wiki/Q1161707","display_name":"Benchmark (surveying)","level":2,"score":0.4251595139503479},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.355840265750885},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.27589690685272217},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.0},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.0},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.0},{"id":"https://openalex.org/C119857082","wikidata":"https://www.wikidata.org/wiki/Q2539","display_name":"Machine learning","level":1,"score":0.0},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.0},{"id":"https://openalex.org/C13280743","wikidata":"https://www.wikidata.org/wiki/Q131089","display_name":"Geodesy","level":1,"score":0.0}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.1109/twc.2018.2890474","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2018.2890474","pdf_url":null,"source":{"id":"https://openalex.org/S63459445","display_name":"IEEE Transactions on Wireless Communications","issn_l":"1536-1276","issn":["1536-1276","1558-2248"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Wireless Communications","raw_type":"journal-article"},{"id":"pmh:oai:eprints.soton.ac.uk:427636","is_oa":false,"landing_page_url":"http://doi.org/10.1109/TWC.2018.2890474>).","pdf_url":null,"source":{"id":"https://openalex.org/S4306401020","display_name":"ePrints Soton (University of Southampton)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I43439940","host_organization_name":"University of Southampton","host_organization_lineage":["https://openalex.org/I43439940"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":null,"raw_type":"PeerReviewed"},{"id":"pmh:oai:qmro.qmul.ac.uk:123456789/61483","is_oa":false,"landing_page_url":"https://qmro.qmul.ac.uk/xmlui/handle/123456789/61483","pdf_url":null,"source":{"id":"https://openalex.org/S4306400530","display_name":"Queen Mary Research Online (Queen Mary University of London)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I166337079","host_organization_name":"Queen Mary University of London","host_organization_lineage":["https://openalex.org/I166337079"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G1190378674","display_name":null,"funder_award_id":"EP/L010550/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G2019173011","display_name":"Enabling High-Speed Microwave and Millimetre Wave Links (MiMiWaveS)","funder_award_id":"EP/N029666/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G2212794949","display_name":null,"funder_award_id":"EP/N029666/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G2422336959","display_name":null,"funder_award_id":"EP/P003990/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G3009845101","display_name":null,"funder_award_id":"EP/J015520/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G3862308619","display_name":null,"funder_award_id":"EP/N029720/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G3962106785","display_name":"Enabling High-Speed Microwave and Millimetre Wave Links (MiMiWaveS)","funder_award_id":"EP/N029720/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"},{"id":"https://openalex.org/G3964311364","display_name":null,"funder_award_id":"EP/N004558/1","funder_id":"https://openalex.org/F4320334627","funder_display_name":"Engineering and Physical Sciences Research Council"}],"funders":[{"id":"https://openalex.org/F4320320006","display_name":"Royal Society","ror":"https://ror.org/03wnrjx87"},{"id":"https://openalex.org/F4320334627","display_name":"Engineering and Physical Sciences Research Council","ror":"https://ror.org/0439y7842"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":54,"referenced_works":["https://openalex.org/W64867182","https://openalex.org/W151604921","https://openalex.org/W1928152501","https://openalex.org/W1970830346","https://openalex.org/W1987210641","https://openalex.org/W2004101329","https://openalex.org/W2011550466","https://openalex.org/W2016828539","https://openalex.org/W2019013468","https://openalex.org/W2031318228","https://openalex.org/W2054692642","https://openalex.org/W2074978263","https://openalex.org/W2100755644","https://openalex.org/W2105235982","https://openalex.org/W2106929598","https://openalex.org/W2109800347","https://openalex.org/W2112300062","https://openalex.org/W2121315337","https://openalex.org/W2131750568","https://openalex.org/W2143021984","https://openalex.org/W2144000019","https://openalex.org/W2151278498","https://openalex.org/W2157005274","https://openalex.org/W2161272050","https://openalex.org/W2166544578","https://openalex.org/W2166733284","https://openalex.org/W2186982976","https://openalex.org/W2191948661","https://openalex.org/W2256970999","https://openalex.org/W2295253609","https://openalex.org/W2296319761","https://openalex.org/W2317760008","https://openalex.org/W2342148475","https://openalex.org/W2343343021","https://openalex.org/W2398409936","https://openalex.org/W2520993345","https://openalex.org/W2554698009","https://openalex.org/W2592659251","https://openalex.org/W2595217078","https://openalex.org/W2596944875","https://openalex.org/W2612557364","https://openalex.org/W2623150508","https://openalex.org/W2741141278","https://openalex.org/W2742503793","https://openalex.org/W2744020042","https://openalex.org/W2744046002","https://openalex.org/W2765134725","https://openalex.org/W2790964695","https://openalex.org/W2963306459","https://openalex.org/W2963652759","https://openalex.org/W2984884920","https://openalex.org/W3008609509","https://openalex.org/W4240429381","https://openalex.org/W4250589301"],"related_works":["https://openalex.org/W2548963335","https://openalex.org/W2159941915","https://openalex.org/W1995129237","https://openalex.org/W1761601995","https://openalex.org/W4300468626","https://openalex.org/W2904599916","https://openalex.org/W2097713053","https://openalex.org/W2909457694","https://openalex.org/W4321608401","https://openalex.org/W2800473611"],"abstract_inverted_index":{"The":[0,13,78],"weighted":[1,138],"sum-rate":[2],"maximization":[3],"problem":[4,99],"of":[5,64,84,150,194],"ultra-dense":[6],"cloud":[7],"radio":[8],"access":[9],"networks":[10],"is":[11,16,72,105,121,190],"considered.":[12],"user-centric":[14],"clustering":[15],"adopted":[17],"for":[18,87,145],"reducing":[19],"the":[20,24,32,39,46,51,61,67,75,82,85,89,101,117,125,135,147,151,156,163,169,174,185,195],"complexity.":[21],"To":[22],"reduce":[23],"training":[25],"overhead,":[26],"one":[27],"only":[28,38],"needs":[29],"to":[30,192],"estimate":[31],"intra-cluster":[33],"channel-state":[34],"information":[35],"(CSI),":[36],"while":[37],"large-scale":[40],"channel":[41],"gains":[42],"are":[43,166],"available":[44],"outside":[45],"cluster.":[47],"We":[48],"first":[49],"derive":[50],"rate":[52,70,104],"lower":[53],"bound":[54],"(LB)":[55],"relying":[56,172],"on":[57,173],"Jensen's":[58],"inequality.":[59],"For":[60,155],"special":[62],"case":[63],"non-overlapping":[65],"clusters,":[66],"accurate":[68],"data":[69,103],"expression":[71],"derived":[73,167],"in":[74,168],"closed":[76,170],"form.":[77],"simulation":[79,181],"results":[80,182],"show":[81,183],"tightness":[83],"LB":[86],"both":[88],"overlapped":[90],"and":[91],"non-overlapped":[92],"cases.":[93],"Then,":[94,132],"we":[95,133],"consider":[96],"an":[97],"alternative":[98],"where":[100],"actual":[102],"replaced":[106],"by":[107,123,159],"its":[108],"LB,":[109],"which":[110,199],"constitutes":[111],"a":[112],"non-convex":[113],"optimization":[114],"problem.":[115],"First,":[116],"globally":[118],"optimal":[119],"solution":[120],"obtained":[122],"applying":[124],"high-complexity":[126,196],"outer":[127],"polyblock":[128],"approximation":[129],"(OPA)":[130],"algorithm.":[131],"invoke":[134],"reduced-complexity":[136],"modified":[137,186],"minimum":[139],"mean":[140],"square":[141],"error":[142],"(WMMSE)":[143],"algorithm":[144],"mitigating":[146],"deleterious":[148],"effects":[149],"realistic":[152],"imperfect":[153],"CSI.":[154],"subproblem":[157],"solved":[158],"each":[160],"WMMSE":[161,187],"iteration,":[162],"beamforming":[164],"vectors":[165],"form":[171],"Lagrangian":[175],"dual":[176],"decomposition":[177],"method.":[178],"Finally,":[179],"our":[180],"that":[184,193],"algorithm's":[188],"performance":[189],"comparable":[191],"OPA":[197],"algorithm,":[198],"outperforms":[200],"other":[201],"benchmark":[202],"algorithms.":[203]},"counts_by_year":[{"year":2025,"cited_by_count":7},{"year":2024,"cited_by_count":4},{"year":2023,"cited_by_count":8},{"year":2022,"cited_by_count":8},{"year":2021,"cited_by_count":13},{"year":2020,"cited_by_count":5},{"year":2019,"cited_by_count":3}],"updated_date":"2026-03-20T23:20:44.827607","created_date":"2025-10-10T00:00:00"}