{"id":"https://openalex.org/W7124171603","doi":"https://doi.org/10.1109/twc.2026.3651766","title":"Orthogonal Complement-Driven Channel Estimation for Multi-RIS Wireless Systems","display_name":"Orthogonal Complement-Driven Channel Estimation for Multi-RIS Wireless Systems","publication_year":2026,"publication_date":"2026-01-01","ids":{"openalex":"https://openalex.org/W7124171603","doi":"https://doi.org/10.1109/twc.2026.3651766"},"language":null,"primary_location":{"id":"doi:10.1109/twc.2026.3651766","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2026.3651766","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":null,"display_name":"Jinkyu Lee","orcid":"https://orcid.org/0009-0003-5515-2677"},"institutions":[{"id":"https://openalex.org/I139264467","display_name":"Seoul National University","ror":"https://ror.org/04h9pn542","country_code":"KR","type":"education","lineage":["https://openalex.org/I139264467"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Jinkyu Lee","raw_affiliation_strings":["Department of Electrical and Computer Engineering and the Institute of New Media and Communications, Seoul National University (SNU), Seoul, South Korea"],"raw_orcid":"https://orcid.org/0009-0003-5515-2677","affiliations":[{"raw_affiliation_string":"Department of Electrical and Computer Engineering and the Institute of New Media and Communications, Seoul National University (SNU), Seoul, South Korea","institution_ids":["https://openalex.org/I139264467"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5039011815","display_name":"Hyowoon Seo","orcid":"https://orcid.org/0000-0002-8681-9476"},"institutions":[{"id":"https://openalex.org/I848706","display_name":"Sungkyunkwan University","ror":"https://ror.org/04q78tk20","country_code":"KR","type":"education","lineage":["https://openalex.org/I848706"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Hyowoon Seo","raw_affiliation_strings":["School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon, South Korea"],"raw_orcid":"https://orcid.org/0000-0002-8681-9476","affiliations":[{"raw_affiliation_string":"School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon, South Korea","institution_ids":["https://openalex.org/I848706"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5122998822","display_name":"Wan Choi","orcid":null},"institutions":[{"id":"https://openalex.org/I139264467","display_name":"Seoul National University","ror":"https://ror.org/04h9pn542","country_code":"KR","type":"education","lineage":["https://openalex.org/I139264467"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Wan Choi","raw_affiliation_strings":["Department of Electrical and Computer Engineering and the Institute of New Media and Communications, Seoul National University (SNU), Seoul, South Korea"],"raw_orcid":"https://orcid.org/0000-0003-3930-7088","affiliations":[{"raw_affiliation_string":"Department of Electrical and Computer Engineering and the Institute of New Media and Communications, Seoul National University (SNU), Seoul, South Korea","institution_ids":["https://openalex.org/I139264467"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.05172414,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"25","issue":null,"first_page":"10209","last_page":"10224"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11458","display_name":"Advanced Wireless Communication Technologies","score":0.9979000091552734,"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/T11458","display_name":"Advanced Wireless Communication Technologies","score":0.9979000091552734,"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/T11192","display_name":"Underwater Vehicles and Communication Systems","score":0.0005000000237487257,"subfield":{"id":"https://openalex.org/subfields/2212","display_name":"Ocean 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/T10148","display_name":"Advanced MIMO Systems Optimization","score":0.00019999999494757503,"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/channel","display_name":"Channel (broadcasting)","score":0.7166000008583069},{"id":"https://openalex.org/keywords/superposition-principle","display_name":"Superposition principle","score":0.6879000067710876},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.6383000016212463},{"id":"https://openalex.org/keywords/overhead","display_name":"Overhead (engineering)","score":0.6328999996185303},{"id":"https://openalex.org/keywords/reflection","display_name":"Reflection (computer programming)","score":0.4512999951839447},{"id":"https://openalex.org/keywords/signal","display_name":"SIGNAL (programming language)","score":0.4099000096321106},{"id":"https://openalex.org/keywords/linear-subspace","display_name":"Linear subspace","score":0.4016000032424927},{"id":"https://openalex.org/keywords/wireless-network","display_name":"Wireless network","score":0.39160001277923584},{"id":"https://openalex.org/keywords/path","display_name":"Path (computing)","score":0.37400001287460327}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7386000156402588},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.7166000008583069},{"id":"https://openalex.org/C27753989","wikidata":"https://www.wikidata.org/wiki/Q284885","display_name":"Superposition principle","level":2,"score":0.6879000067710876},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.6383000016212463},{"id":"https://openalex.org/C2779960059","wikidata":"https://www.wikidata.org/wiki/Q7113681","display_name":"Overhead (engineering)","level":2,"score":0.6328999996185303},{"id":"https://openalex.org/C65682993","wikidata":"https://www.wikidata.org/wiki/Q1056451","display_name":"Reflection (computer programming)","level":2,"score":0.4512999951839447},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.43059998750686646},{"id":"https://openalex.org/C2779843651","wikidata":"https://www.wikidata.org/wiki/Q7390335","display_name":"SIGNAL (programming language)","level":2,"score":0.4099000096321106},{"id":"https://openalex.org/C12362212","wikidata":"https://www.wikidata.org/wiki/Q728435","display_name":"Linear subspace","level":2,"score":0.4016000032424927},{"id":"https://openalex.org/C108037233","wikidata":"https://www.wikidata.org/wiki/Q11375","display_name":"Wireless network","level":3,"score":0.39160001277923584},{"id":"https://openalex.org/C104267543","wikidata":"https://www.wikidata.org/wiki/Q208163","display_name":"Signal processing","level":3,"score":0.37400001287460327},{"id":"https://openalex.org/C2777735758","wikidata":"https://www.wikidata.org/wiki/Q817765","display_name":"Path (computing)","level":2,"score":0.37400001287460327},{"id":"https://openalex.org/C41700454","wikidata":"https://www.wikidata.org/wiki/Q1852282","display_name":"Reflection coefficient","level":2,"score":0.37070000171661377},{"id":"https://openalex.org/C77618280","wikidata":"https://www.wikidata.org/wiki/Q1155772","display_name":"Scheme (mathematics)","level":2,"score":0.3619000017642975},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.3400999903678894},{"id":"https://openalex.org/C40409654","wikidata":"https://www.wikidata.org/wiki/Q375889","display_name":"Orthogonal frequency-division multiplexing","level":3,"score":0.33820000290870667},{"id":"https://openalex.org/C167928553","wikidata":"https://www.wikidata.org/wiki/Q1376021","display_name":"Estimation theory","level":2,"score":0.32659998536109924},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3215000033378601},{"id":"https://openalex.org/C2776257435","wikidata":"https://www.wikidata.org/wiki/Q1576430","display_name":"Bandwidth (computing)","level":2,"score":0.3167000114917755},{"id":"https://openalex.org/C194273485","wikidata":"https://www.wikidata.org/wiki/Q1478845","display_name":"Path loss","level":3,"score":0.31060001254081726},{"id":"https://openalex.org/C13944312","wikidata":"https://www.wikidata.org/wiki/Q7512748","display_name":"Signal-to-noise ratio (imaging)","level":2,"score":0.2971000075340271},{"id":"https://openalex.org/C184720557","wikidata":"https://www.wikidata.org/wiki/Q7825049","display_name":"Topology (electrical circuits)","level":2,"score":0.2831999957561493},{"id":"https://openalex.org/C24590314","wikidata":"https://www.wikidata.org/wiki/Q336038","display_name":"Wireless sensor network","level":2,"score":0.2770000100135803},{"id":"https://openalex.org/C2776096036","wikidata":"https://www.wikidata.org/wiki/Q1140483","display_name":"Narrowband","level":2,"score":0.2639999985694885},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2630999982357025},{"id":"https://openalex.org/C179799912","wikidata":"https://www.wikidata.org/wiki/Q205084","display_name":"Computational complexity theory","level":2,"score":0.2547000050544739},{"id":"https://openalex.org/C96250715","wikidata":"https://www.wikidata.org/wiki/Q965330","display_name":"Estimation","level":2,"score":0.25119999051094055}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/twc.2026.3651766","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2026.3651766","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"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G1938019663","display_name":null,"funder_award_id":"RS-2024-00436923","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G3894033896","display_name":null,"funder_award_id":"RS-2023-00271540","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G4544186544","display_name":null,"funder_award_id":"IITP-2025-2021-0-02048","funder_id":"https://openalex.org/F4320335489","funder_display_name":"Institute for Information and Communications Technology Promotion"}],"funders":[{"id":"https://openalex.org/F4320322120","display_name":"National Research Foundation of Korea","ror":"https://ror.org/013aysd81"},{"id":"https://openalex.org/F4320335489","display_name":"Institute for Information and Communications Technology Promotion","ror":"https://ror.org/01g0hqq23"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":29,"referenced_works":["https://openalex.org/W1997834106","https://openalex.org/W2054692642","https://openalex.org/W3093874970","https://openalex.org/W3096723356","https://openalex.org/W3158743991","https://openalex.org/W3190774574","https://openalex.org/W3197026645","https://openalex.org/W3201584873","https://openalex.org/W3202006029","https://openalex.org/W3203675995","https://openalex.org/W4226061238","https://openalex.org/W4285104979","https://openalex.org/W4301657906","https://openalex.org/W4321770460","https://openalex.org/W4362683599","https://openalex.org/W4377710206","https://openalex.org/W4378364861","https://openalex.org/W4387789438","https://openalex.org/W4390496060","https://openalex.org/W4390938784","https://openalex.org/W4392543711","https://openalex.org/W4397026583","https://openalex.org/W4398757456","https://openalex.org/W4399766326","https://openalex.org/W4403022968","https://openalex.org/W4403635747","https://openalex.org/W4408017173","https://openalex.org/W4408258780","https://openalex.org/W4409237237"],"related_works":[],"abstract_inverted_index":{"Recent":[0],"breakthroughs":[1],"in":[2,183],"reconfigurable":[3],"intelligent":[4],"surface":[5],"(RIS)":[6],"technology":[7],"are":[8,120],"reshaping":[9],"next-generation":[10],"wireless":[11,185],"networks.":[12,186],"In":[13,90,108],"multi-RIS":[14,88,181],"deployments,":[15],"however,":[16],"the":[17,38,62,69,91,94,109,112,117,124,129,135,151,164],"received":[18,95,138],"signal":[19,96],"is":[20,97],"a":[21,82,176],"superposition":[22],"of":[23,71,128,158],"numerous":[24],"single-":[25],"and":[26,59,73],"double-reflection":[27],"paths,":[28],"some":[29],"arrive":[30],"from":[31,105],"different":[32,106],"angles":[33],"while":[34,170],"others":[35],"overlap":[36],"at":[37],"same":[39,118,136],"angle,":[40],"which":[41],"makes":[42],"channel":[43,84],"estimation":[44,85,168],"challenging.":[45],"Conventional":[46],"approaches":[47],"attempt":[48],"to":[49,102,154],"separate":[50,103],"these":[51],"paths":[52],"by":[53,122],"sequentially":[54],"turning":[55],"each":[56],"RIS":[57],"on":[58,134],"off,":[60],"but":[61],"required":[63],"switching":[64,172],"overhead":[65],"grows":[66],"rapidly":[67],"with":[68],"number":[70,157],"channels":[72],"becomes":[74],"impractical.":[75],"To":[76],"overcome":[77],"this":[78],"limitation,":[79],"we":[80],"propose":[81],"two-stage":[83],"method":[86,147],"for":[87,179],"systems.":[89],"first":[92],"stage,":[93,111],"projected":[98],"onto":[99],"angle":[100,119],"subspaces":[101],"components":[104,114],"directions.":[107],"second":[110],"remaining":[113],"that":[115,163],"share":[116],"resolved":[121],"exploiting":[123],"reflection":[125],"coefficient":[126],"design":[127],"RISs.":[130,159],"Both":[131],"stages":[132],"operate":[133],"superposed":[137],"signal,":[139],"enabling":[140],"path":[141],"separation":[142],"without":[143],"exhaustive":[144],"switching.":[145],"The":[146],"further":[148],"extends":[149],"beyond":[150],"two-RIS":[152],"case":[153],"an":[155],"arbitrary":[156],"Simulation":[160],"results":[161],"demonstrate":[162],"proposed":[165],"scheme":[166],"maintains":[167],"accuracy":[169],"reducing":[171],"overhead,":[173],"thereby":[174],"providing":[175],"practical":[177],"solution":[178],"large-scale":[180],"deployments":[182],"future":[184]},"counts_by_year":[],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2026-01-15T00:00:00"}