{"id":"https://openalex.org/W4407168325","doi":"https://doi.org/10.1109/ojcoms.2025.3539229","title":"Tight Approximation of Achievable Rates in RIS-Based Multi-User MIMO Systems Under Channel Estimation Constraints","display_name":"Tight Approximation of Achievable Rates in RIS-Based Multi-User MIMO Systems Under Channel Estimation Constraints","publication_year":2025,"publication_date":"2025-01-01","ids":{"openalex":"https://openalex.org/W4407168325","doi":"https://doi.org/10.1109/ojcoms.2025.3539229"},"language":"en","primary_location":{"id":"doi:10.1109/ojcoms.2025.3539229","is_oa":true,"landing_page_url":"https://doi.org/10.1109/ojcoms.2025.3539229","pdf_url":null,"source":{"id":"https://openalex.org/S4210202420","display_name":"IEEE Open Journal of the Communications Society","issn_l":"2644-125X","issn":["2644-125X"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310316002","host_organization_name":"IEEE Communications Society","host_organization_lineage":["https://openalex.org/P4310316002","https://openalex.org/P4310319808"],"host_organization_lineage_names":["IEEE Communications Society","Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Open Journal of the Communications Society","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://doi.org/10.1109/ojcoms.2025.3539229","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5068143992","display_name":"Samar I. Farghaly","orcid":"https://orcid.org/0000-0001-8088-312X"},"institutions":[{"id":"https://openalex.org/I21376657","display_name":"Tanta University","ror":"https://ror.org/016jp5b92","country_code":"EG","type":"education","lineage":["https://openalex.org/I21376657"]}],"countries":["EG"],"is_corresponding":true,"raw_author_name":"Samar I. Farghaly","raw_affiliation_strings":["Department of Electronics and Electrical Communications Engineering, Faculty of Engineering, Tanta University, Tanta, Egypt"],"affiliations":[{"raw_affiliation_string":"Department of Electronics and Electrical Communications Engineering, Faculty of Engineering, Tanta University, Tanta, Egypt","institution_ids":["https://openalex.org/I21376657"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5101537027","display_name":"M. Ismail","orcid":"https://orcid.org/0009-0002-7587-6958"},"institutions":[{"id":"https://openalex.org/I106969075","display_name":"Idaho State University","ror":"https://ror.org/0162z8b04","country_code":"US","type":"education","lineage":["https://openalex.org/I106969075"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Mohamed I. Ismail","raw_affiliation_strings":["Department of Electrical and Computer Engineering, College of Science and Engineering, Idaho State University, Pocatello, ID, USA"],"affiliations":[{"raw_affiliation_string":"Department of Electrical and Computer Engineering, College of Science and Engineering, Idaho State University, Pocatello, ID, USA","institution_ids":["https://openalex.org/I106969075"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5068882573","display_name":"Mostafa M. Fouda","orcid":"https://orcid.org/0000-0003-1790-8640"},"institutions":[{"id":"https://openalex.org/I106969075","display_name":"Idaho State University","ror":"https://ror.org/0162z8b04","country_code":"US","type":"education","lineage":["https://openalex.org/I106969075"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Mostafa M. Fouda","raw_affiliation_strings":["Department of Electrical and Computer Engineering, College of Science and Engineering, Idaho State University, Pocatello, ID, USA"],"affiliations":[{"raw_affiliation_string":"Department of Electrical and Computer Engineering, College of Science and Engineering, Idaho State University, Pocatello, ID, USA","institution_ids":["https://openalex.org/I106969075"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5102814520","display_name":"Ahmed S. Alwakeel","orcid":"https://orcid.org/0000-0003-2494-9010"},"institutions":[{"id":"https://openalex.org/I130009713","display_name":"Suez University","ror":"https://ror.org/00ndhrx30","country_code":"EG","type":"education","lineage":["https://openalex.org/I130009713"]}],"countries":["EG"],"is_corresponding":false,"raw_author_name":"Ahmed S. Alwakeel","raw_affiliation_strings":["Department of Electrical Engineering, Faculty of Engineering, Suez University, Suez, Egypt"],"affiliations":[{"raw_affiliation_string":"Department of Electrical Engineering, Faculty of Engineering, Suez University, Suez, Egypt","institution_ids":["https://openalex.org/I130009713"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5068143992"],"corresponding_institution_ids":["https://openalex.org/I21376657"],"apc_list":{"value":1750,"currency":"USD","value_usd":1750},"apc_paid":{"value":1750,"currency":"USD","value_usd":1750},"fwci":5.6523,"has_fulltext":false,"cited_by_count":8,"citation_normalized_percentile":{"value":0.95692361,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":97,"max":100},"biblio":{"volume":"6","issue":null,"first_page":"1299","last_page":"1327"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":0.9994000196456909,"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":0.9994000196456909,"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/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9945999979972839,"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/T10575","display_name":"Wireless Communication Networks Research","score":0.9940999746322632,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.7248735427856445},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.6365682482719421},{"id":"https://openalex.org/keywords/estimation","display_name":"Estimation","score":0.5308626294136047},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4974806606769562},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.37999382615089417},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.3750095069408417},{"id":"https://openalex.org/keywords/control-theory","display_name":"Control theory (sociology)","score":0.33729690313339233},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.19277387857437134},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.16820812225341797},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.08499187231063843},{"id":"https://openalex.org/keywords/systems-engineering","display_name":"Systems engineering","score":0.06206420063972473}],"concepts":[{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.7248735427856445},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.6365682482719421},{"id":"https://openalex.org/C96250715","wikidata":"https://www.wikidata.org/wiki/Q965330","display_name":"Estimation","level":2,"score":0.5308626294136047},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4974806606769562},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.37999382615089417},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.3750095069408417},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.33729690313339233},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.19277387857437134},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.16820812225341797},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.08499187231063843},{"id":"https://openalex.org/C201995342","wikidata":"https://www.wikidata.org/wiki/Q682496","display_name":"Systems engineering","level":1,"score":0.06206420063972473},{"id":"https://openalex.org/C2775924081","wikidata":"https://www.wikidata.org/wiki/Q55608371","display_name":"Control (management)","level":2,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1109/ojcoms.2025.3539229","is_oa":true,"landing_page_url":"https://doi.org/10.1109/ojcoms.2025.3539229","pdf_url":null,"source":{"id":"https://openalex.org/S4210202420","display_name":"IEEE Open Journal of the Communications Society","issn_l":"2644-125X","issn":["2644-125X"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310316002","host_organization_name":"IEEE Communications Society","host_organization_lineage":["https://openalex.org/P4310316002","https://openalex.org/P4310319808"],"host_organization_lineage_names":["IEEE Communications Society","Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Open Journal of the Communications Society","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:a2df407faf1842b5ac43d83259930270","is_oa":true,"landing_page_url":"https://doaj.org/article/a2df407faf1842b5ac43d83259930270","pdf_url":null,"source":{"id":"https://openalex.org/S112646816","display_name":"SHILAP Revista de lepidopterolog\u00eda","issn_l":"0300-5267","issn":["0300-5267","2340-4078"],"is_oa":true,"is_in_doaj":true,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"IEEE Open Journal of the Communications Society, Vol 6, Pp 1299-1327 (2025)","raw_type":"article"}],"best_oa_location":{"id":"doi:10.1109/ojcoms.2025.3539229","is_oa":true,"landing_page_url":"https://doi.org/10.1109/ojcoms.2025.3539229","pdf_url":null,"source":{"id":"https://openalex.org/S4210202420","display_name":"IEEE Open Journal of the Communications Society","issn_l":"2644-125X","issn":["2644-125X"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310316002","host_organization_name":"IEEE Communications Society","host_organization_lineage":["https://openalex.org/P4310316002","https://openalex.org/P4310319808"],"host_organization_lineage_names":["IEEE Communications Society","Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Open Journal of the Communications Society","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G2552724881","display_name":null,"funder_award_id":"2210252","funder_id":"https://openalex.org/F4320306076","funder_display_name":"National Science Foundation"}],"funders":[{"id":"https://openalex.org/F4320306076","display_name":"National Science Foundation","ror":"https://ror.org/021nxhr62"}],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":43,"referenced_works":["https://openalex.org/W2136133623","https://openalex.org/W2163068306","https://openalex.org/W2963355537","https://openalex.org/W2968389137","https://openalex.org/W2969424089","https://openalex.org/W2971912794","https://openalex.org/W2973110004","https://openalex.org/W2981096252","https://openalex.org/W2985466239","https://openalex.org/W3009563387","https://openalex.org/W3010384738","https://openalex.org/W3010695123","https://openalex.org/W3013639278","https://openalex.org/W3021024154","https://openalex.org/W3021225717","https://openalex.org/W3022272562","https://openalex.org/W3039402952","https://openalex.org/W3047239226","https://openalex.org/W3059813204","https://openalex.org/W3091365446","https://openalex.org/W3130437501","https://openalex.org/W3144244478","https://openalex.org/W3149825481","https://openalex.org/W3159402647","https://openalex.org/W3180206688","https://openalex.org/W3193247573","https://openalex.org/W3199000380","https://openalex.org/W3199166544","https://openalex.org/W3203387279","https://openalex.org/W4214614326","https://openalex.org/W4226061238","https://openalex.org/W4285300455","https://openalex.org/W4291722330","https://openalex.org/W4296915796","https://openalex.org/W4312051188","https://openalex.org/W4312415321","https://openalex.org/W4312549396","https://openalex.org/W4322576964","https://openalex.org/W4378421618","https://openalex.org/W4388207438","https://openalex.org/W4388895085","https://openalex.org/W4390871476","https://openalex.org/W4392309364"],"related_works":["https://openalex.org/W1982160337","https://openalex.org/W1971380437","https://openalex.org/W2545343974","https://openalex.org/W4291895924","https://openalex.org/W1983548084","https://openalex.org/W2141691317","https://openalex.org/W2110846987","https://openalex.org/W1783583321","https://openalex.org/W2160609742","https://openalex.org/W2979526210"],"abstract_inverted_index":{"The":[0,174],"rapid":[1],"and":[2,34,51,56,73,98,124,198,213],"low-power":[3],"configuration":[4],"capabilities":[5],"of":[6,23,47,78,155,180,200],"Reconfigurable":[7],"Intelligent":[8],"Surfaces":[9],"(RISs)":[10],"have":[11,27,43],"made":[12],"them":[13],"an":[14],"attractive":[15],"option":[16],"for":[17,107,208],"future":[18],"wireless":[19,203],"networks":[20],"in":[21,211],"terms":[22],"energy":[24],"efficiency.":[25],"They":[26],"the":[28,76,95,108,139,153,161,177,196],"ability":[29],"to":[30,93,130,144,160],"greatly":[31],"increase":[32],"connection":[33],"facilitate":[35],"low-latency":[36],"communications.":[37],"However,":[38],"because":[39],"RIS-based":[40],"systems":[41],"often":[42],"a":[44,61,69,79,103,145],"large":[45],"number":[46],"RIS":[48,181],"unit":[49],"elements":[50],"unique":[52],"hardware":[53],"constraints,":[54],"accurate":[55],"low-overhead":[57],"channel":[58,70,116,140],"estimate":[59],"remains":[60],"crucial":[62,193],"challenge.":[63],"In":[64,128],"this":[65],"study,":[66],"we":[67],"offer":[68],"estimation":[71,141],"framework":[72],"concentrate":[74],"on":[75,182],"uplink":[77,109],"multi-user":[80,202],"multiple-input":[81],"multiple-output":[82],"(MU-MIMO)":[83],"communication":[84],"system":[85,99,167,183],"driven":[86],"by":[87],"RIS.":[88],"Our":[89,190],"primary":[90],"goal":[91],"is":[92,120],"enhance":[94],"achievable":[96,110,163],"rate":[97,111,164,212],"capacity.":[100,214],"We":[101],"derive":[102],"closed-form":[104],"deterministic":[105],"expression":[106,158],"under":[112],"practical":[113],"scenarios":[114],"where":[115],"state":[117],"information":[118],"(CSI)":[119],"not":[121],"directly":[122],"known":[123],"must":[125],"be":[126],"estimated.":[127],"contrast":[129],"previous":[131],"studies":[132],"assuming":[133],"perfect":[134],"CSI,":[135],"our":[136,156],"approach":[137],"incorporates":[138],"process,":[142],"leading":[143],"more":[146],"realistic":[147],"performance":[148,184],"assessment.":[149],"Extensive":[150],"simulations":[151],"validate":[152],"tightness":[154],"derived":[157],"compared":[159],"actual":[162],"across":[165],"various":[166],"parameters":[168],"(with":[169],"discrepancies":[170],"typically":[171],"within":[172],"2-5%).":[173],"results":[175],"highlight":[176],"significant":[178],"impact":[179],"enhancement,":[185],"even":[186],"with":[187],"imperfect":[188],"CSI.":[189],"findings":[191],"provide":[192],"insights":[194],"into":[195],"deployment":[197],"optimization":[199],"RIS-assisted":[201],"networks,":[204],"underscoring":[205],"their":[206],"potential":[207],"substantial":[209],"improvements":[210]},"counts_by_year":[{"year":2026,"cited_by_count":4},{"year":2025,"cited_by_count":4}],"updated_date":"2026-04-07T14:57:38.498316","created_date":"2025-10-10T00:00:00"}