{"id":"https://openalex.org/W2118242001","doi":"https://doi.org/10.1109/pimrc.2009.5450272","title":"CQI-report optimization for multi-mode MIMO with unitary codebook based precoding","display_name":"CQI-report optimization for multi-mode MIMO with unitary codebook based precoding","publication_year":2009,"publication_date":"2009-09-01","ids":{"openalex":"https://openalex.org/W2118242001","doi":"https://doi.org/10.1109/pimrc.2009.5450272","mag":"2118242001"},"language":"en","primary_location":{"id":"doi:10.1109/pimrc.2009.5450272","is_oa":false,"landing_page_url":"https://doi.org/10.1109/pimrc.2009.5450272","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","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/A5010372409","display_name":"Helka\u2010Liina M\u00e4\u00e4tt\u00e4nen","orcid":null},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Helka-Liina Maattanen","raw_affiliation_strings":["Helsinki University of Technology, Finland","Helsinki University of Technology (TKK)#TAB#"],"affiliations":[{"raw_affiliation_string":"Helsinki University of Technology, Finland","institution_ids":[]},{"raw_affiliation_string":"Helsinki University of Technology (TKK)#TAB#","institution_ids":[]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5006597250","display_name":"Olav Tirkkonen","orcid":"https://orcid.org/0000-0002-2611-1636"},"institutions":[{"id":"https://openalex.org/I2738502077","display_name":"Nokia (Finland)","ror":"https://ror.org/04pkc8m17","country_code":"FI","type":"company","lineage":["https://openalex.org/I2738502077"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Olav Tirkkonen","raw_affiliation_strings":["Nokia Research Center, Helsinki University of Technology, Finland","Helsinki University of Technology (TKK), Nokia Research Center"],"affiliations":[{"raw_affiliation_string":"Nokia Research Center, Helsinki University of Technology, Finland","institution_ids":["https://openalex.org/I2738502077"]},{"raw_affiliation_string":"Helsinki University of Technology (TKK), Nokia Research Center","institution_ids":["https://openalex.org/I2738502077"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5046562117","display_name":"Timo Roman","orcid":null},"institutions":[{"id":"https://openalex.org/I4210106018","display_name":"Nokia (Netherlands)","ror":"https://ror.org/01resg468","country_code":"NL","type":"company","lineage":["https://openalex.org/I2738502077","https://openalex.org/I4210106018"]},{"id":"https://openalex.org/I2738502077","display_name":"Nokia (Finland)","ror":"https://ror.org/04pkc8m17","country_code":"FI","type":"company","lineage":["https://openalex.org/I2738502077"]}],"countries":["FI","NL"],"is_corresponding":false,"raw_author_name":"Timo Roman","raw_affiliation_strings":["Nokia Devices","Nokia Devices,"],"affiliations":[{"raw_affiliation_string":"Nokia Devices","institution_ids":["https://openalex.org/I2738502077"]},{"raw_affiliation_string":"Nokia Devices,","institution_ids":["https://openalex.org/I4210106018"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5010372409"],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.5982,"has_fulltext":false,"cited_by_count":7,"citation_normalized_percentile":{"value":0.72280205,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":97},"biblio":{"volume":null,"issue":null,"first_page":"3084","last_page":"3088"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":0.9998999834060669,"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":0.9998999834060669,"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/T11409","display_name":"Advanced Wireless Network Optimization","score":0.9995999932289124,"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":0.9979000091552734,"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/precoding","display_name":"Precoding","score":0.9215167164802551},{"id":"https://openalex.org/keywords/codebook","display_name":"Codebook","score":0.8397446274757385},{"id":"https://openalex.org/keywords/telecommunications-link","display_name":"Telecommunications link","score":0.709183931350708},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6760692000389099},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.6530286073684692},{"id":"https://openalex.org/keywords/zero-forcing-precoding","display_name":"Zero-forcing precoding","score":0.5863109827041626},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.5141101479530334},{"id":"https://openalex.org/keywords/link-adaptation","display_name":"Link adaptation","score":0.4970565140247345},{"id":"https://openalex.org/keywords/quantization","display_name":"Quantization (signal processing)","score":0.484282910823822},{"id":"https://openalex.org/keywords/control-theory","display_name":"Control theory (sociology)","score":0.45030084252357483},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.3582995533943176},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.35413485765457153},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.23940283060073853},{"id":"https://openalex.org/keywords/fading","display_name":"Fading","score":0.19455647468566895},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.12304902076721191},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.07165315747261047}],"concepts":[{"id":"https://openalex.org/C160562895","wikidata":"https://www.wikidata.org/wiki/Q7239557","display_name":"Precoding","level":4,"score":0.9215167164802551},{"id":"https://openalex.org/C127759330","wikidata":"https://www.wikidata.org/wiki/Q637416","display_name":"Codebook","level":2,"score":0.8397446274757385},{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.709183931350708},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6760692000389099},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.6530286073684692},{"id":"https://openalex.org/C155437304","wikidata":"https://www.wikidata.org/wiki/Q8069444","display_name":"Zero-forcing precoding","level":5,"score":0.5863109827041626},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.5141101479530334},{"id":"https://openalex.org/C138916503","wikidata":"https://www.wikidata.org/wiki/Q2714551","display_name":"Link adaptation","level":4,"score":0.4970565140247345},{"id":"https://openalex.org/C28855332","wikidata":"https://www.wikidata.org/wiki/Q198099","display_name":"Quantization (signal processing)","level":2,"score":0.484282910823822},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.45030084252357483},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.3582995533943176},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.35413485765457153},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.23940283060073853},{"id":"https://openalex.org/C81978471","wikidata":"https://www.wikidata.org/wiki/Q1196572","display_name":"Fading","level":3,"score":0.19455647468566895},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.12304902076721191},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.07165315747261047},{"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/pimrc.2009.5450272","is_oa":false,"landing_page_url":"https://doi.org/10.1109/pimrc.2009.5450272","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","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":6,"referenced_works":["https://openalex.org/W1995875735","https://openalex.org/W2112277368","https://openalex.org/W2130521103","https://openalex.org/W2147643489","https://openalex.org/W2160779252","https://openalex.org/W2161515500"],"related_works":["https://openalex.org/W2123156148","https://openalex.org/W2111825998","https://openalex.org/W2012665287","https://openalex.org/W2326544815","https://openalex.org/W1973158664","https://openalex.org/W1731022149","https://openalex.org/W1996933839","https://openalex.org/W2000226056","https://openalex.org/W4386858283","https://openalex.org/W3141240674"],"abstract_inverted_index":{"In":[0,100],"this":[1],"paper":[2],"we":[3,118],"consider":[4,119],"the":[5,34,54,63,78,87,123,128],"CQI":[6],"reporting":[7,111,121,131],"problem":[8],"in":[9,71,80],"MIMO":[10],"downlink":[11],"with":[12],"adaptive":[13,96],"switching":[14],"between":[15,138],"single":[16,81,139],"user":[17,82,140],"and":[18,21,37,98,141],"multiuser":[19,59,72,124,142],"mode":[20,73],"finite":[22],"rate":[23],"feedback.":[24],"The":[25,51,84],"feedback":[26,108],"consist":[27],"of":[28,46,53,86],"channel":[29,38,55,88,113,129],"directional":[30,56],"information,":[31,40],"which":[32,41],"is":[33,42,74],"precoding":[35],"weight,":[36],"quality":[39,89,114,130],"a":[43,68,92],"quantized":[44],"value":[45],"estimated":[47],"post":[48,64],"processing":[49,65],"SINR.":[50,143],"quantization":[52,137],"information":[57,90],"causes":[58],"interference":[60],"so":[61],"that":[62],"SINR":[66,79],"after":[67],"linear":[69],"receiver":[70],"considerably":[75],"different":[76],"from":[77],"mode.":[83,125],"accuracy":[85],"plays":[91],"relevant":[93],"role":[94],"for":[95,115,122],"modulation":[97],"coding.":[99],"order":[101],"to":[102],"achieve":[103],"good":[104],"performance":[105],"without":[106],"increasing":[107],"load":[109],"by":[110,132],"accurate":[112],"both":[116],"modes,":[117],"differential":[120,136],"We":[126],"optimize":[127],"considering":[133],"an":[134],"optimum":[135]},"counts_by_year":[{"year":2018,"cited_by_count":1},{"year":2015,"cited_by_count":1},{"year":2014,"cited_by_count":3},{"year":2012,"cited_by_count":2}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}