{"id":"https://openalex.org/W2620619669","doi":"https://doi.org/10.1155/2009/894726","title":"Downlink Assisted Uplink Zero Forcing for TDD Multiuser MIMO Systems","display_name":"Downlink Assisted Uplink Zero Forcing for TDD Multiuser MIMO Systems","publication_year":2009,"publication_date":"2009-09-10","ids":{"openalex":"https://openalex.org/W2620619669","doi":"https://doi.org/10.1155/2009/894726","mag":"2620619669"},"language":"en","primary_location":{"id":"doi:10.1155/2009/894726","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2009/894726","pdf_url":"https://jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/894726","source":{"id":"https://openalex.org/S82675988","display_name":"EURASIP Journal on Wireless Communications and Networking","issn_l":"1687-1472","issn":["1687-1472","1687-1499"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310319965","host_organization_name":"Springer Nature","host_organization_lineage":["https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Nature"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"EURASIP Journal on Wireless Communications and Networking","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/894726","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5044160110","display_name":"Petri Komulainen","orcid":null},"institutions":[{"id":"https://openalex.org/I98381234","display_name":"University of Oulu","ror":"https://ror.org/03yj89h83","country_code":"FI","type":"education","lineage":["https://openalex.org/I98381234"]}],"countries":["FI"],"is_corresponding":true,"raw_author_name":"Petri Komulainen","raw_affiliation_strings":["Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland"],"affiliations":[{"raw_affiliation_string":"Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland","institution_ids":["https://openalex.org/I98381234"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5039827493","display_name":"Antti T\u00f6lli","orcid":"https://orcid.org/0000-0001-6219-9770"},"institutions":[{"id":"https://openalex.org/I98381234","display_name":"University of Oulu","ror":"https://ror.org/03yj89h83","country_code":"FI","type":"education","lineage":["https://openalex.org/I98381234"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Antti T\u00f6lli","raw_affiliation_strings":["Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland"],"affiliations":[{"raw_affiliation_string":"Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland","institution_ids":["https://openalex.org/I98381234"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5035872239","display_name":"Matti Latva\u2010aho","orcid":"https://orcid.org/0000-0002-6261-0969"},"institutions":[{"id":"https://openalex.org/I98381234","display_name":"University of Oulu","ror":"https://ror.org/03yj89h83","country_code":"FI","type":"education","lineage":["https://openalex.org/I98381234"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Matti Latva-aho","raw_affiliation_strings":["Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland"],"affiliations":[{"raw_affiliation_string":"Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland","institution_ids":["https://openalex.org/I98381234"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5029534229","display_name":"Markku Juntti","orcid":"https://orcid.org/0000-0002-5413-1896"},"institutions":[{"id":"https://openalex.org/I98381234","display_name":"University of Oulu","ror":"https://ror.org/03yj89h83","country_code":"FI","type":"education","lineage":["https://openalex.org/I98381234"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Markku Juntti","raw_affiliation_strings":["Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland"],"affiliations":[{"raw_affiliation_string":"Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland","institution_ids":["https://openalex.org/I98381234"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5044160110"],"corresponding_institution_ids":["https://openalex.org/I98381234"],"apc_list":{"value":1140,"currency":"GBP","value_usd":1398},"apc_paid":{"value":1140,"currency":"GBP","value_usd":1398},"fwci":0.9121,"has_fulltext":true,"cited_by_count":8,"citation_normalized_percentile":{"value":0.79263727,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"2009","issue":"1","first_page":null,"last_page":null},"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/T12791","display_name":"Full-Duplex Wireless Communications","score":0.9998000264167786,"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":0.9997000098228455,"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/telecommunications-link","display_name":"Telecommunications link","score":0.8344544768333435},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.8119231462478638},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.7302988767623901},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.6217120289802551},{"id":"https://openalex.org/keywords/base-station","display_name":"Base station","score":0.5863114595413208},{"id":"https://openalex.org/keywords/overhead","display_name":"Overhead (engineering)","score":0.5712098479270935},{"id":"https://openalex.org/keywords/transmission","display_name":"Transmission (telecommunications)","score":0.5528146028518677},{"id":"https://openalex.org/keywords/precoding","display_name":"Precoding","score":0.5458595752716064},{"id":"https://openalex.org/keywords/duplex","display_name":"Duplex (building)","score":0.5070657730102539},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.4770438075065613},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.41734498739242554},{"id":"https://openalex.org/keywords/real-time-computing","display_name":"Real-time computing","score":0.3876504898071289},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.32697558403015137},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2790943384170532},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.22538480162620544},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.08325260877609253}],"concepts":[{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.8344544768333435},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8119231462478638},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.7302988767623901},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.6217120289802551},{"id":"https://openalex.org/C68649174","wikidata":"https://www.wikidata.org/wiki/Q1379116","display_name":"Base station","level":2,"score":0.5863114595413208},{"id":"https://openalex.org/C2779960059","wikidata":"https://www.wikidata.org/wiki/Q7113681","display_name":"Overhead (engineering)","level":2,"score":0.5712098479270935},{"id":"https://openalex.org/C761482","wikidata":"https://www.wikidata.org/wiki/Q118093","display_name":"Transmission (telecommunications)","level":2,"score":0.5528146028518677},{"id":"https://openalex.org/C160562895","wikidata":"https://www.wikidata.org/wiki/Q7239557","display_name":"Precoding","level":4,"score":0.5458595752716064},{"id":"https://openalex.org/C99611785","wikidata":"https://www.wikidata.org/wiki/Q6453233","display_name":"Duplex (building)","level":3,"score":0.5070657730102539},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.4770438075065613},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.41734498739242554},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3876504898071289},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.32697558403015137},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2790943384170532},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.22538480162620544},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.08325260877609253},{"id":"https://openalex.org/C54355233","wikidata":"https://www.wikidata.org/wiki/Q7162","display_name":"Genetics","level":1,"score":0.0},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.0},{"id":"https://openalex.org/C552990157","wikidata":"https://www.wikidata.org/wiki/Q7430","display_name":"DNA","level":2,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1155/2009/894726","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2009/894726","pdf_url":"https://jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/894726","source":{"id":"https://openalex.org/S82675988","display_name":"EURASIP Journal on Wireless Communications and Networking","issn_l":"1687-1472","issn":["1687-1472","1687-1499"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310319965","host_organization_name":"Springer Nature","host_organization_lineage":["https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Nature"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"EURASIP Journal on Wireless Communications and Networking","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:4584b1bc511341ddb957ecc03385c3d9","is_oa":true,"landing_page_url":"https://doaj.org/article/4584b1bc511341ddb957ecc03385c3d9","pdf_url":null,"source":{"id":"https://openalex.org/S112646816","display_name":"SHILAP Revista de lepidopterolog\u00eda","issn_l":"0300-5267","issn":["0300-5267","2340-4078"],"is_oa":true,"is_in_doaj":true,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"EURASIP Journal on Wireless Communications and Networking, Vol 2009 (2009)","raw_type":"article"}],"best_oa_location":{"id":"doi:10.1155/2009/894726","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2009/894726","pdf_url":"https://jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/894726","source":{"id":"https://openalex.org/S82675988","display_name":"EURASIP Journal on Wireless Communications and Networking","issn_l":"1687-1472","issn":["1687-1472","1687-1499"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310319965","host_organization_name":"Springer Nature","host_organization_lineage":["https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Nature"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"EURASIP Journal on Wireless Communications and Networking","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320321855","display_name":"Tekes","ror":"https://ror.org/02ag8cq23"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2620619669.pdf","grobid_xml":"https://content.openalex.org/works/W2620619669.grobid-xml"},"referenced_works_count":19,"referenced_works":["https://openalex.org/W1581039813","https://openalex.org/W1974891392","https://openalex.org/W2042225056","https://openalex.org/W2097183892","https://openalex.org/W2098126478","https://openalex.org/W2100995993","https://openalex.org/W2103749601","https://openalex.org/W2114043910","https://openalex.org/W2122437257","https://openalex.org/W2123836500","https://openalex.org/W2136653297","https://openalex.org/W2139706615","https://openalex.org/W2154177870","https://openalex.org/W2155847893","https://openalex.org/W2164497732","https://openalex.org/W2164536085","https://openalex.org/W2169402362","https://openalex.org/W3143835353","https://openalex.org/W4250677164"],"related_works":["https://openalex.org/W3141240674","https://openalex.org/W4365807906","https://openalex.org/W2157864637","https://openalex.org/W2116541631","https://openalex.org/W2744170735","https://openalex.org/W4223416141","https://openalex.org/W2514205366","https://openalex.org/W2546639359","https://openalex.org/W3173074004","https://openalex.org/W2578955643"],"abstract_inverted_index":{"This":[0],"paper":[1],"proposes":[2],"practical":[3],"coordinated":[4],"linear":[5],"transmit-receive":[6,65],"processing":[7],"schemes":[8],"for":[9,76,103,134],"the":[10,20,31,46,49,58,63,68,89,97,104,118,127,143,157,159],"uplink":[11],"(UL)":[12],"of":[13,48,96,142],"multiuser":[14],"multiple-input":[15],"multiple-output":[16],"(MIMO)":[17],"systems":[18],"in":[19,34,132,147],"time":[21],"division":[22],"duplex":[23],"(TDD)":[24],"mode.":[25],"The":[26,138],"base":[27],"station":[28],"(BS)":[29],"computes":[30],"transmission":[32,162,171],"parameters":[33],"a":[35],"centralized":[36],"manner":[37],"and":[38,52,110,151],"employs":[39],"downlink":[40],"(DL)":[41],"pilot":[42,84,120],"signals":[43],"to":[44,54,106,116,156,168,179,187],"convey":[45],"information":[47,94],"beam":[50,78],"selection":[51,175,182],"beamformers":[53],"be":[55,74],"used":[56],"by":[57],"terminals.":[59],"When":[60],"coexisting":[61],"with":[62,152,173],"DL":[64,70],"zero":[66],"forcing,":[67],"precoded":[69,128],"demodulation":[71,130],"pilots":[72,131],"can":[73],"reused":[75],"UL":[77,119,129,161,180],"allocation":[79,112],"so":[80],"that":[81],"no":[82],"additional":[83],"overhead":[85,121],"is":[86,101,145],"required.":[87],"Furthermore,":[88],"locally":[90],"available":[91],"channel":[92,100,153],"state":[93],"(CSI)":[95],"effective":[98],"MIMO":[99,170],"sufficient":[102],"terminals":[105],"perform":[107],"transmit":[108],"power":[109],"rate":[111,141],"independently.":[113],"In":[114],"order":[115],"reduce":[117],"as":[122,176,178],"well,":[123],"we":[124],"propose":[125],"reusing":[126],"turn":[133],"partial":[135],"CSI":[136,188],"sounding.":[137],"achievable":[139],"sum":[140],"system":[144],"evaluated":[146],"time-varying":[148],"fading":[149],"channels":[150],"estimation.":[154],"According":[155],"results,":[158],"proposed":[160],"strategy":[163],"provides":[164],"increased":[165],"rates":[166],"compared":[167],"single-user":[169],"combined":[172],"user":[174],"well":[177],"antenna":[181],"transmission,":[183],"without":[184],"being":[185],"sensitive":[186],"uncertainty.":[189]},"counts_by_year":[{"year":2016,"cited_by_count":1},{"year":2015,"cited_by_count":1},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":2}],"updated_date":"2026-03-20T23:20:44.827607","created_date":"2025-10-10T00:00:00"}
