{"id":"https://openalex.org/W3158853690","doi":"https://doi.org/10.1109/tccn.2021.3075413","title":"Channel Estimation Approach for RIS Assisted MIMO Systems","display_name":"Channel Estimation Approach for RIS Assisted MIMO Systems","publication_year":2021,"publication_date":"2021-04-28","ids":{"openalex":"https://openalex.org/W3158853690","doi":"https://doi.org/10.1109/tccn.2021.3075413","mag":"3158853690"},"language":"en","primary_location":{"id":"doi:10.1109/tccn.2021.3075413","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tccn.2021.3075413","pdf_url":null,"source":{"id":"https://openalex.org/S2484188435","display_name":"IEEE Transactions on Cognitive Communications and Networking","issn_l":"2332-7731","issn":["2332-7731","2372-2045"],"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 Cognitive Communications and Networking","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/A5051082918","display_name":"Eyad Shtaiwi","orcid":"https://orcid.org/0000-0001-6319-3637"},"institutions":[{"id":"https://openalex.org/I44461941","display_name":"University of Houston","ror":"https://ror.org/048sx0r50","country_code":"US","type":"education","lineage":["https://openalex.org/I44461941"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Eyad Shtaiwi","raw_affiliation_strings":["Electrical and Computer Engineering Department, University of Houston, Houston, TX, USA"],"raw_orcid":"https://orcid.org/0000-0001-6319-3637","affiliations":[{"raw_affiliation_string":"Electrical and Computer Engineering Department, University of Houston, Houston, TX, USA","institution_ids":["https://openalex.org/I44461941"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100440579","display_name":"Hongliang Zhang","orcid":"https://orcid.org/0000-0003-3393-8612"},"institutions":[{"id":"https://openalex.org/I20089843","display_name":"Princeton University","ror":"https://ror.org/00hx57361","country_code":"US","type":"education","lineage":["https://openalex.org/I20089843"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Hongliang Zhang","raw_affiliation_strings":["Department of Electrical Engineering, Princeton University, Princeton, NJ, USA"],"raw_orcid":"https://orcid.org/0000-0003-3393-8612","affiliations":[{"raw_affiliation_string":"Department of Electrical Engineering, Princeton University, Princeton, NJ, USA","institution_ids":["https://openalex.org/I20089843"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5088120102","display_name":"Sriram Vishwanath","orcid":"https://orcid.org/0000-0003-3112-4885"},"institutions":[{"id":"https://openalex.org/I86519309","display_name":"The University of Texas at Austin","ror":"https://ror.org/00hj54h04","country_code":"US","type":"education","lineage":["https://openalex.org/I86519309"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Sriram Vishwanath","raw_affiliation_strings":["Electrical and Computer Engineering Department, The University of Texas at Austin, Austin, TX, USA"],"raw_orcid":"https://orcid.org/0000-0003-3112-4885","affiliations":[{"raw_affiliation_string":"Electrical and Computer Engineering Department, The University of Texas at Austin, Austin, TX, USA","institution_ids":["https://openalex.org/I86519309"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5008352007","display_name":"Moustafa Youssef","orcid":"https://orcid.org/0000-0002-2063-4364"},"institutions":[{"id":"https://openalex.org/I84524832","display_name":"Alexandria University","ror":"https://ror.org/00mzz1w90","country_code":"EG","type":"education","lineage":["https://openalex.org/I84524832"]}],"countries":["EG"],"is_corresponding":false,"raw_author_name":"Moustafa Youssef","raw_affiliation_strings":["Department of Computer Science and Engineering, Alexandria University, Alexandria, Egypt"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, Alexandria University, Alexandria, Egypt","institution_ids":["https://openalex.org/I84524832"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5012796841","display_name":"Ahmed Abdelhadi","orcid":"https://orcid.org/0000-0003-0545-4477"},"institutions":[{"id":"https://openalex.org/I44461941","display_name":"University of Houston","ror":"https://ror.org/048sx0r50","country_code":"US","type":"education","lineage":["https://openalex.org/I44461941"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Ahmed Abdelhadi","raw_affiliation_strings":["Department of Engineering Technology, University of Houston, TX, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Engineering Technology, University of Houston, TX, USA","institution_ids":["https://openalex.org/I44461941"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5063667378","display_name":"Zhu Han","orcid":"https://orcid.org/0000-0002-6606-5822"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]},{"id":"https://openalex.org/I44461941","display_name":"University of Houston","ror":"https://ror.org/048sx0r50","country_code":"US","type":"education","lineage":["https://openalex.org/I44461941"]}],"countries":["KR","US"],"is_corresponding":false,"raw_author_name":"Zhu Han","raw_affiliation_strings":["Department of Computer Science and Engineering, Kyung Hee University, Seoul, South Korea","Electrical and Computer Engineering Department, University of Houston, Houston, TX, USA"],"raw_orcid":"https://orcid.org/0000-0002-6606-5822","affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, Kyung Hee University, Seoul, South Korea","institution_ids":["https://openalex.org/I35928602"]},{"raw_affiliation_string":"Electrical and Computer Engineering Department, University of Houston, Houston, TX, USA","institution_ids":["https://openalex.org/I44461941"]}]}],"institutions":[],"countries_distinct_count":3,"institutions_distinct_count":5,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":6.0975,"has_fulltext":false,"cited_by_count":78,"citation_normalized_percentile":{"value":0.97119564,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":97,"max":100},"biblio":{"volume":"7","issue":"2","first_page":"452","last_page":"465"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11458","display_name":"Advanced Wireless Communication Technologies","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/T11458","display_name":"Advanced Wireless Communication Technologies","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/T11383","display_name":"Advanced Antenna and Metasurface Technologies","score":0.9955999851226807,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace 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/T10069","display_name":"Antenna Design and Analysis","score":0.9945999979972839,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace 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/telecommunications-link","display_name":"Telecommunications link","score":0.7240451574325562},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.7217928171157837},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.7070320844650269},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.6975972652435303},{"id":"https://openalex.org/keywords/scheduling","display_name":"Scheduling (production processes)","score":0.5181523561477661},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.49076804518699646},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.2826577425003052},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.26909035444259644},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.14923012256622314}],"concepts":[{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.7240451574325562},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.7217928171157837},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7070320844650269},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.6975972652435303},{"id":"https://openalex.org/C206729178","wikidata":"https://www.wikidata.org/wiki/Q2271896","display_name":"Scheduling (production processes)","level":2,"score":0.5181523561477661},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.49076804518699646},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.2826577425003052},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.26909035444259644},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.14923012256622314}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/tccn.2021.3075413","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tccn.2021.3075413","pdf_url":null,"source":{"id":"https://openalex.org/S2484188435","display_name":"IEEE Transactions on Cognitive Communications and Networking","issn_l":"2332-7731","issn":["2332-7731","2372-2045"],"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 Cognitive Communications and Networking","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":52,"referenced_works":["https://openalex.org/W1752175949","https://openalex.org/W1975494153","https://openalex.org/W1988395888","https://openalex.org/W2054692642","https://openalex.org/W2065105631","https://openalex.org/W2098841537","https://openalex.org/W2140941610","https://openalex.org/W2478157570","https://openalex.org/W2591983868","https://openalex.org/W2600647254","https://openalex.org/W2610669350","https://openalex.org/W2767613687","https://openalex.org/W2805166665","https://openalex.org/W2891354184","https://openalex.org/W2937693915","https://openalex.org/W2950077417","https://openalex.org/W2953984813","https://openalex.org/W2969424089","https://openalex.org/W2970670564","https://openalex.org/W2971912794","https://openalex.org/W2981792785","https://openalex.org/W2985466239","https://openalex.org/W2990747873","https://openalex.org/W2993316576","https://openalex.org/W2994742101","https://openalex.org/W2995554704","https://openalex.org/W2996738588","https://openalex.org/W3005112765","https://openalex.org/W3009918410","https://openalex.org/W3010695123","https://openalex.org/W3011747750","https://openalex.org/W3015419519","https://openalex.org/W3017311957","https://openalex.org/W3021225717","https://openalex.org/W3021564798","https://openalex.org/W3021587675","https://openalex.org/W3032095193","https://openalex.org/W3034281970","https://openalex.org/W3034533409","https://openalex.org/W3035697904","https://openalex.org/W3039402952","https://openalex.org/W3043220753","https://openalex.org/W3048215566","https://openalex.org/W3080525847","https://openalex.org/W3087258725","https://openalex.org/W3099679786","https://openalex.org/W3100218246","https://openalex.org/W3103026331","https://openalex.org/W3115287968","https://openalex.org/W3134059753","https://openalex.org/W3134746776","https://openalex.org/W4288365549"],"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/W3040536194"],"abstract_inverted_index":{"Reconfigurable":[0],"Intelligent":[1],"Surfaces":[2],"(RISs)":[3],"are":[4],"planner":[5],"surfaces":[6],"that":[7],"include":[8],"a":[9,68,151],"large":[10],"number":[11],"of":[12,21,110,116,165,178],"passively":[13],"radiating":[14],"elements.":[15],"By":[16],"changing":[17],"the":[18,28,38,54,59,83,86,91,95,114,117,122,132,145,161,174,179],"phase":[19,136,162],"shifts":[20,137],"these":[22,135],"passive":[23,153],"elements,":[24],"RISs":[25],"can":[26,143],"shape":[27],"propagation":[29],"environment.":[30],"This":[31,56],"requires":[32],"accurate":[33],"channel":[34,66,93],"state":[35],"information.":[36],"However,":[37],"Channel":[39],"Estimation":[40],"(CE)":[41],"process":[42],"is":[43],"challenging":[44],"because":[45],"transmitting":[46],"and/or":[47],"signal":[48],"processing":[49],"means":[50],"being":[51],"unworkable":[52],"at":[53],"RIS.":[55],"paper":[57],"investigates":[58],"CE":[60],"problem":[61],"for":[62,67,94,138],"an":[63,79],"Uplink":[64],"(UL)":[65],"RIS-aided":[69],"Multi-user":[70],"Multiple-Input":[71],"Multiple-Output":[72],"(MU-MIMO)":[73],"system.":[74],"In":[75],"particular,":[76],"we":[77,142,149],"propose":[78,150],"algorithm":[80],"to":[81],"estimate":[82,144],"composite":[84],"channel,":[85],"separate":[87],"RIS-based":[88],"channels,":[89],"and":[90,108,113,129,158,176],"direct":[92],"RIS-assisted":[96],"system":[97],"by":[98,130],"exploiting":[99],"symmetric":[100],"positive":[101],"definite":[102],"(SPD)":[103],"properties":[104],"matrices;":[105],"e.g.,":[106],"invertibility":[107],"existence":[109],"global":[111],"minimum,":[112],"uniqueness":[115],"Chelosky":[118],"decomposition.":[119],"We":[120],"divide":[121],"entire":[123],"RIS":[124],"surface":[125],"into":[126],"small":[127],"sub-RISs,":[128],"controlling":[131],"changes":[133],"in":[134],"every":[139],"sub-RIS":[140,169],"surfaces,":[141],"overall":[146],"channel.":[147],"Moreover,":[148],"simple":[152],"pilot":[154],"sequence":[155],"scheduling":[156],"scheme":[157],"jointly":[159],"adjusting":[160],"shift":[163],"coefficients":[164],"elements":[166],"on":[167],"each":[168],"unit.":[170],"Simulation":[171],"results":[172],"justify":[173],"efficiency":[175],"effectiveness":[177],"proposed":[180],"approach":[181],"algorithm.":[182]},"counts_by_year":[{"year":2025,"cited_by_count":16},{"year":2024,"cited_by_count":19},{"year":2023,"cited_by_count":23},{"year":2022,"cited_by_count":15},{"year":2021,"cited_by_count":5}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
