{"id":"https://openalex.org/W3118645808","doi":"https://doi.org/10.1109/wpmc50192.2020.9309493","title":"Improved Null-Space Expansion Scheme under Presence of Channel Estimation Error for Multiuser Massive MIMO","display_name":"Improved Null-Space Expansion Scheme under Presence of Channel Estimation Error for Multiuser Massive MIMO","publication_year":2020,"publication_date":"2020-10-19","ids":{"openalex":"https://openalex.org/W3118645808","doi":"https://doi.org/10.1109/wpmc50192.2020.9309493","mag":"3118645808"},"language":"en","primary_location":{"id":"doi:10.1109/wpmc50192.2020.9309493","is_oa":false,"landing_page_url":"https://doi.org/10.1109/wpmc50192.2020.9309493","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2020 23rd International Symposium on Wireless Personal Multimedia Communications (WPMC)","raw_type":"proceedings-article"},"type":"conference-paper","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/A5006328269","display_name":"Nobutaka Funaki","orcid":"https://orcid.org/0000-0003-1695-8670"},"institutions":[{"id":"https://openalex.org/I159385669","display_name":"Chiba University","ror":"https://ror.org/01hjzeq58","country_code":"JP","type":"education","lineage":["https://openalex.org/I159385669"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Nobutaka Funaki","raw_affiliation_strings":["Graduate School of Engineering, Chiba University, Chiba, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Graduate School of Engineering, Chiba University, Chiba, Japan","institution_ids":["https://openalex.org/I159385669"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5002904170","display_name":"Kazuki Maruta","orcid":"https://orcid.org/0000-0001-9635-3182"},"institutions":[{"id":"https://openalex.org/I114531698","display_name":"Tokyo Institute of Technology","ror":"https://ror.org/0112mx960","country_code":"JP","type":"education","lineage":["https://openalex.org/I114531698"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Kazuki Maruta","raw_affiliation_strings":["Academy for Super Smart Society, Tokyo Institute of Technology, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Academy for Super Smart Society, Tokyo Institute of Technology, Tokyo, Japan","institution_ids":["https://openalex.org/I114531698"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5108759844","display_name":"Chang-Jun Ahn","orcid":null},"institutions":[{"id":"https://openalex.org/I159385669","display_name":"Chiba University","ror":"https://ror.org/01hjzeq58","country_code":"JP","type":"education","lineage":["https://openalex.org/I159385669"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Chang-Jun Ahn","raw_affiliation_strings":["Graduate School of Engineering, Chiba University, Chiba, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Graduate School of Engineering, Chiba University, Chiba, Japan","institution_ids":["https://openalex.org/I159385669"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":1.0735,"has_fulltext":false,"cited_by_count":4,"citation_normalized_percentile":{"value":0.75475386,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":95},"biblio":{"volume":null,"issue":null,"first_page":"1","last_page":"4"},"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/T10796","display_name":"Cooperative Communication and Network Coding","score":0.9991000294685364,"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"}},{"id":"https://openalex.org/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9987000226974487,"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/null","display_name":"Null (SQL)","score":0.7867450714111328},{"id":"https://openalex.org/keywords/subspace-topology","display_name":"Subspace topology","score":0.786632239818573},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.7194698452949524},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.6616255044937134},{"id":"https://openalex.org/keywords/interference","display_name":"Interference (communication)","score":0.6377160549163818},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.6363115906715393},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5642312169075012},{"id":"https://openalex.org/keywords/dimension","display_name":"Dimension (graph theory)","score":0.5088622570037842},{"id":"https://openalex.org/keywords/noise","display_name":"Noise (video)","score":0.4802534878253937},{"id":"https://openalex.org/keywords/multiuser-detection","display_name":"Multiuser detection","score":0.456226646900177},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.45588716864585876},{"id":"https://openalex.org/keywords/control-theory","display_name":"Control theory (sociology)","score":0.3803059756755829},{"id":"https://openalex.org/keywords/topology","display_name":"Topology (electrical circuits)","score":0.325333833694458},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.3064417243003845},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2638271450996399},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.1386532485485077},{"id":"https://openalex.org/keywords/code-division-multiple-access","display_name":"Code division multiple access","score":0.10497596859931946},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.07241937518119812},{"id":"https://openalex.org/keywords/data-mining","display_name":"Data mining","score":0.06916463375091553}],"concepts":[{"id":"https://openalex.org/C203763787","wikidata":"https://www.wikidata.org/wiki/Q371029","display_name":"Null (SQL)","level":2,"score":0.7867450714111328},{"id":"https://openalex.org/C32834561","wikidata":"https://www.wikidata.org/wiki/Q660730","display_name":"Subspace topology","level":2,"score":0.786632239818573},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.7194698452949524},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.6616255044937134},{"id":"https://openalex.org/C32022120","wikidata":"https://www.wikidata.org/wiki/Q797225","display_name":"Interference (communication)","level":3,"score":0.6377160549163818},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.6363115906715393},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5642312169075012},{"id":"https://openalex.org/C33676613","wikidata":"https://www.wikidata.org/wiki/Q13415176","display_name":"Dimension (graph theory)","level":2,"score":0.5088622570037842},{"id":"https://openalex.org/C99498987","wikidata":"https://www.wikidata.org/wiki/Q2210247","display_name":"Noise (video)","level":3,"score":0.4802534878253937},{"id":"https://openalex.org/C2777104032","wikidata":"https://www.wikidata.org/wiki/Q16324514","display_name":"Multiuser detection","level":3,"score":0.456226646900177},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.45588716864585876},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.3803059756755829},{"id":"https://openalex.org/C184720557","wikidata":"https://www.wikidata.org/wiki/Q7825049","display_name":"Topology (electrical circuits)","level":2,"score":0.325333833694458},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.3064417243003845},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2638271450996399},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.1386532485485077},{"id":"https://openalex.org/C47696715","wikidata":"https://www.wikidata.org/wiki/Q233394","display_name":"Code division multiple access","level":2,"score":0.10497596859931946},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.07241937518119812},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.06916463375091553},{"id":"https://openalex.org/C115961682","wikidata":"https://www.wikidata.org/wiki/Q860623","display_name":"Image (mathematics)","level":2,"score":0.0},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.0},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.0},{"id":"https://openalex.org/C2775924081","wikidata":"https://www.wikidata.org/wiki/Q55608371","display_name":"Control (management)","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/wpmc50192.2020.9309493","is_oa":false,"landing_page_url":"https://doi.org/10.1109/wpmc50192.2020.9309493","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2020 23rd International Symposium on Wireless Personal Multimedia Communications (WPMC)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":9,"referenced_works":["https://openalex.org/W2048515205","https://openalex.org/W2054692642","https://openalex.org/W2107566191","https://openalex.org/W2141682101","https://openalex.org/W2167826425","https://openalex.org/W2551881412","https://openalex.org/W2747386168","https://openalex.org/W2902609280","https://openalex.org/W2907812480"],"related_works":["https://openalex.org/W1980381208","https://openalex.org/W2059045613","https://openalex.org/W2374377455","https://openalex.org/W884630482","https://openalex.org/W2059997762","https://openalex.org/W1549272705","https://openalex.org/W2384122953","https://openalex.org/W2025723618","https://openalex.org/W2552025594","https://openalex.org/W4211013851"],"abstract_inverted_index":{"This":[0],"paper":[1],"improves":[2],"the":[3,28,54],"previously":[4],"proposed":[5],"null-space":[6,29],"expansion":[7],"scheme":[8],"for":[9],"multiuser":[10],"massive":[11],"MIMO":[12],"down-link":[13],"in":[14],"time":[15],"varying":[16],"channels.":[17],"By":[18],"exploiting":[19],"past":[20],"estimated":[21],"channel":[22,69],"state":[23],"information":[24],"(CSI),":[25],"it":[26,41],"expands":[27],"even":[30],"against":[31],"future":[32],"interference":[33,68],"channel.":[34],"Its":[35,74],"fundamental":[36],"feasibility":[37],"was":[38],"proven,":[39],"however,":[40],"assumed":[42],"perfect":[43],"knowledge":[44],"of":[45,67],"CSI":[46,50],"at":[47],"estimation":[48],"instant.":[49],"imperfection":[51],"due":[52],"to":[53,70],"additive":[55],"noise":[56],"effect":[57],"limits":[58],"its":[59],"performance.":[60],"We":[61],"proposes":[62],"a":[63],"subspace":[64],"dimension":[65],"reduction":[66],"avoid":[71],"excessive":[72],"null-steering.":[73],"effectiveness":[75],"is":[76],"validated":[77],"through":[78],"computer":[79],"simulation.":[80]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2021,"cited_by_count":2},{"year":2020,"cited_by_count":1}],"updated_date":"2026-07-29T14:22:42.915294","created_date":"2025-10-10T00:00:00"}
