{"id":"https://openalex.org/W4315630010","doi":"https://doi.org/10.1109/globecom48099.2022.10000679","title":"Energy-Efficient Precoder Design in RIS-Assisted Multiuser MIMO Cognitive Radio Networks","display_name":"Energy-Efficient Precoder Design in RIS-Assisted Multiuser MIMO Cognitive Radio Networks","publication_year":2022,"publication_date":"2022-12-04","ids":{"openalex":"https://openalex.org/W4315630010","doi":"https://doi.org/10.1109/globecom48099.2022.10000679"},"language":"en","primary_location":{"id":"doi:10.1109/globecom48099.2022.10000679","is_oa":false,"landing_page_url":"https://doi.org/10.1109/globecom48099.2022.10000679","pdf_url":null,"source":{"id":"https://openalex.org/S4363607705","display_name":"GLOBECOM 2022 - 2022 IEEE Global Communications Conference","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"conference"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"GLOBECOM 2022 - 2022 IEEE Global Communications Conference","raw_type":"proceedings-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/A5017824926","display_name":"Raviteja Allu","orcid":"https://orcid.org/0000-0002-3871-678X"},"institutions":[{"id":"https://openalex.org/I142974352","display_name":"National Sun Yat-sen University","ror":"https://ror.org/00mjawt10","country_code":"TW","type":"education","lineage":["https://openalex.org/I142974352"]}],"countries":["TW"],"is_corresponding":true,"raw_author_name":"Raviteja Allu","raw_affiliation_strings":["Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan"],"affiliations":[{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","institution_ids":["https://openalex.org/I142974352"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5050609414","display_name":"Sandeep Kumar Singh","orcid":"https://orcid.org/0000-0002-2405-0470"},"institutions":[{"id":"https://openalex.org/I142974352","display_name":"National Sun Yat-sen University","ror":"https://ror.org/00mjawt10","country_code":"TW","type":"education","lineage":["https://openalex.org/I142974352"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Sandeep Kumar Singh","raw_affiliation_strings":["Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan"],"affiliations":[{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","institution_ids":["https://openalex.org/I142974352"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5064845302","display_name":"Omid Taghizadeh","orcid":"https://orcid.org/0000-0001-6482-8200"},"institutions":[{"id":"https://openalex.org/I142974352","display_name":"National Sun Yat-sen University","ror":"https://ror.org/00mjawt10","country_code":"TW","type":"education","lineage":["https://openalex.org/I142974352"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Omid Taghizadeh","raw_affiliation_strings":["Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","5G Wireless Research Group,Lenovo Deutschland GmbH, Germany"],"affiliations":[{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"5G Wireless Research Group,Lenovo Deutschland GmbH, Germany","institution_ids":[]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5071647281","display_name":"Keshav Singh","orcid":"https://orcid.org/0000-0001-9028-4518"},"institutions":[{"id":"https://openalex.org/I142974352","display_name":"National Sun Yat-sen University","ror":"https://ror.org/00mjawt10","country_code":"TW","type":"education","lineage":["https://openalex.org/I142974352"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Keshav Singh","raw_affiliation_strings":["Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan"],"affiliations":[{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","institution_ids":["https://openalex.org/I142974352"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5050916758","display_name":"Chih-Peng Lit","orcid":null},"institutions":[{"id":"https://openalex.org/I142974352","display_name":"National Sun Yat-sen University","ror":"https://ror.org/00mjawt10","country_code":"TW","type":"education","lineage":["https://openalex.org/I142974352"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Chih-Peng Lit","raw_affiliation_strings":["Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan"],"affiliations":[{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University,Kaohsiung,Taiwan","institution_ids":["https://openalex.org/I142974352"]},{"raw_affiliation_string":"Institute of Communications Engineering,National Sun Yat-sen University, Kaohsiung, Taiwan","institution_ids":["https://openalex.org/I142974352"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5017824926"],"corresponding_institution_ids":["https://openalex.org/I142974352"],"apc_list":null,"apc_paid":null,"fwci":1.6121,"has_fulltext":false,"cited_by_count":5,"citation_normalized_percentile":{"value":0.84538547,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":97},"biblio":{"volume":null,"issue":null,"first_page":"3338","last_page":"3343"},"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/T10148","display_name":"Advanced MIMO Systems Optimization","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/T10326","display_name":"Indoor and Outdoor Localization Technologies","score":0.9958999752998352,"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/precoding","display_name":"Precoding","score":0.7504904270172119},{"id":"https://openalex.org/keywords/cognitive-radio","display_name":"Cognitive radio","score":0.6910721659660339},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6270852088928223},{"id":"https://openalex.org/keywords/transmitter","display_name":"Transmitter","score":0.5819835066795349},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.5806607007980347},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.559820294380188},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.49882960319519043},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.4508230686187744},{"id":"https://openalex.org/keywords/transmitter-power-output","display_name":"Transmitter power output","score":0.4391269385814667},{"id":"https://openalex.org/keywords/convex-optimization","display_name":"Convex optimization","score":0.43727290630340576},{"id":"https://openalex.org/keywords/optimization-problem","display_name":"Optimization problem","score":0.4102688729763031},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.3537139594554901},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.3387734293937683},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.24601981043815613},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.24360942840576172},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2169894278049469},{"id":"https://openalex.org/keywords/regular-polygon","display_name":"Regular polygon","score":0.11913195252418518},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.115323007106781}],"concepts":[{"id":"https://openalex.org/C160562895","wikidata":"https://www.wikidata.org/wiki/Q7239557","display_name":"Precoding","level":4,"score":0.7504904270172119},{"id":"https://openalex.org/C149946192","wikidata":"https://www.wikidata.org/wiki/Q3235733","display_name":"Cognitive radio","level":3,"score":0.6910721659660339},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6270852088928223},{"id":"https://openalex.org/C47798520","wikidata":"https://www.wikidata.org/wiki/Q190157","display_name":"Transmitter","level":3,"score":0.5819835066795349},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.5806607007980347},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.559820294380188},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.49882960319519043},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.4508230686187744},{"id":"https://openalex.org/C65422117","wikidata":"https://www.wikidata.org/wiki/Q358527","display_name":"Transmitter power output","level":4,"score":0.4391269385814667},{"id":"https://openalex.org/C157972887","wikidata":"https://www.wikidata.org/wiki/Q463359","display_name":"Convex optimization","level":3,"score":0.43727290630340576},{"id":"https://openalex.org/C137836250","wikidata":"https://www.wikidata.org/wiki/Q984063","display_name":"Optimization problem","level":2,"score":0.4102688729763031},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.3537139594554901},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.3387734293937683},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.24601981043815613},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.24360942840576172},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2169894278049469},{"id":"https://openalex.org/C112680207","wikidata":"https://www.wikidata.org/wiki/Q714886","display_name":"Regular polygon","level":2,"score":0.11913195252418518},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.115323007106781},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/globecom48099.2022.10000679","is_oa":false,"landing_page_url":"https://doi.org/10.1109/globecom48099.2022.10000679","pdf_url":null,"source":{"id":"https://openalex.org/S4363607705","display_name":"GLOBECOM 2022 - 2022 IEEE Global Communications Conference","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"conference"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"GLOBECOM 2022 - 2022 IEEE Global Communications Conference","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/7","score":0.9100000262260437,"display_name":"Affordable and clean energy"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":30,"referenced_works":["https://openalex.org/W1971063774","https://openalex.org/W2048637996","https://openalex.org/W2949436132","https://openalex.org/W2968389137","https://openalex.org/W3003499446","https://openalex.org/W3021024154","https://openalex.org/W3027118737","https://openalex.org/W3036886449","https://openalex.org/W3041253942","https://openalex.org/W3082159919","https://openalex.org/W3100536113","https://openalex.org/W3114609582","https://openalex.org/W3157277360","https://openalex.org/W3163236698","https://openalex.org/W3180102453","https://openalex.org/W3185068011","https://openalex.org/W3190430387","https://openalex.org/W3194721843","https://openalex.org/W3197792384","https://openalex.org/W3199708577","https://openalex.org/W3205415745","https://openalex.org/W3205905181","https://openalex.org/W3211257091","https://openalex.org/W3211304744","https://openalex.org/W4225966556","https://openalex.org/W4250589301","https://openalex.org/W6775903679","https://openalex.org/W6789912688","https://openalex.org/W6791596381","https://openalex.org/W6803253033"],"related_works":["https://openalex.org/W2167568384","https://openalex.org/W2116541631","https://openalex.org/W2514205366","https://openalex.org/W3173074004","https://openalex.org/W1976511355","https://openalex.org/W2064335375","https://openalex.org/W2083202929","https://openalex.org/W2544668827","https://openalex.org/W2075530143","https://openalex.org/W1985632843"],"abstract_inverted_index":{"Reconfigurable":[0],"intelligent":[1],"surface":[2],"(RIS)":[3],"is":[4,206],"an":[5,146],"emerging":[6],"next-generation":[7],"technology":[8],"that":[9,149,202],"can":[10],"improve":[11],"the":[12,22,26,55,61,70,74,81,89,95,102,119,128,139,151,167,172,183,196,203,210],"energy":[13,46],"efficiency":[14,47],"using":[15,156,177],"multiple":[16],"low-power":[17],"passive":[18,65],"metasurfaces":[19],"which":[20],"reflect":[21],"desired":[23],"signal":[24],"to":[25,52,73,94,113],"users.":[27],"In":[28],"this":[29],"work,":[30],"we":[31,125,144],"consider":[32],"a":[33,44,133],"RIS-assisted":[34],"underlay":[35],"multiuser":[36],"multiple-input":[37],"multiple-output":[38],"cognitive":[39],"radio":[40],"network":[41,198],"and":[42,64,84,99,106,154,161,169,199],"formulate":[43],"weighted":[45,120],"maximization":[48],"problem":[49,103],"in":[50],"order":[51],"jointly":[53],"optimize":[54],"active":[56],"precoding":[57,66],"matrix":[58,67],"(APM)":[59],"at":[60,69,80,214],"secondary":[62,82],"transmitter":[63,83],"(PPM)":[68],"RIS":[71],"subject":[72],"constraints":[75],"of":[76,97,171,182],"available":[77],"transmission":[78],"power":[79],"maximum":[85],"allowable":[86],"interference":[87],"towards":[88],"primary":[90],"user/receiver.":[91],"However,":[92],"due":[93],"coupling":[96],"APM":[98,153],"PPM":[100,155],"variables,":[101],"becomes":[104],"non-convex,":[105],"conventional":[107],"optimization":[108],"methods":[109],"cannot":[110],"be":[111],"used":[112],"solve":[114],"it.":[115],"Therefore,":[116],"by":[117],"adopting":[118],"minimum":[121],"mean-square":[122],"error":[123,188],"method":[124,160],"first":[126],"transform":[127],"non-convex":[129],"objective":[130],"function":[131],"into":[132],"convex":[134],"one.":[135],"Next,":[136],"based":[137],"on":[138,195],"block":[140],"coordinate":[141],"descent":[142],"method,":[143,164],"propose":[145],"iterative":[147],"algorithm":[148,174],"determines":[150],"optimal":[152],"Lagrange":[157],"dual":[158],"decomposition":[159],"inner":[162],"approximation":[163],"respectively.":[165],"Finally,":[166],"optimality":[168],"efficacy":[170],"proposed":[173,197,204],"are":[175],"validated":[176],"numerical":[178,193],"simulations.":[179],"The":[180],"impact":[181],"channel":[184],"state":[185],"information":[186],"(CSI)":[187],"has":[189],"been":[190],"studied":[191],"via":[192],"simulations":[194],"it":[200],"shows":[201],"design":[205],"relatively":[207],"robust":[208],"against":[209],"CSI":[211],"imperfections,":[212],"especially":[213],"low":[215],"SNR":[216],"conditions.":[217]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":3},{"year":2023,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}