{"id":"https://openalex.org/W2109211018","doi":"https://doi.org/10.1109/vetecs.2009.5073444","title":"Closed-Loop Beamspace MIMO Systems with Low Hardware Complexity","display_name":"Closed-Loop Beamspace MIMO Systems with Low Hardware Complexity","publication_year":2009,"publication_date":"2009-04-01","ids":{"openalex":"https://openalex.org/W2109211018","doi":"https://doi.org/10.1109/vetecs.2009.5073444","mag":"2109211018"},"language":"en","primary_location":{"id":"doi:10.1109/vetecs.2009.5073444","is_oa":false,"landing_page_url":"https://doi.org/10.1109/vetecs.2009.5073444","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"VTC Spring 2009 - IEEE 69th Vehicular Technology 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/A5055502592","display_name":"Vlasis I. Barousis","orcid":null},"institutions":[{"id":"https://openalex.org/I154757721","display_name":"University of Piraeus","ror":"https://ror.org/02qs84g94","country_code":"GR","type":"education","lineage":["https://openalex.org/I154757721"]}],"countries":["GR"],"is_corresponding":true,"raw_author_name":"Vlasis Barousis","raw_affiliation_strings":["Department of Digital Systems, University of Piraeus, Piraeus, Greece","Dept. of Digital Syst., Univ. of Piraeus, Piraeus"],"affiliations":[{"raw_affiliation_string":"Department of Digital Systems, University of Piraeus, Piraeus, Greece","institution_ids":["https://openalex.org/I154757721"]},{"raw_affiliation_string":"Dept. of Digital Syst., Univ. of Piraeus, Piraeus","institution_ids":["https://openalex.org/I154757721"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5040433148","display_name":"\u0391thanasios G. Kanatas","orcid":"https://orcid.org/0000-0002-1966-4937"},"institutions":[{"id":"https://openalex.org/I154757721","display_name":"University of Piraeus","ror":"https://ror.org/02qs84g94","country_code":"GR","type":"education","lineage":["https://openalex.org/I154757721"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Athanasios G. Kanatas","raw_affiliation_strings":["Department of Digital Systems, University of Piraeus, Piraeus, Greece","Dept. of Digital Syst., Univ. of Piraeus, Piraeus"],"affiliations":[{"raw_affiliation_string":"Department of Digital Systems, University of Piraeus, Piraeus, Greece","institution_ids":["https://openalex.org/I154757721"]},{"raw_affiliation_string":"Dept. of Digital Syst., Univ. of Piraeus, Piraeus","institution_ids":["https://openalex.org/I154757721"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5067037816","display_name":"Antonis Kalis","orcid":null},"institutions":[{"id":"https://openalex.org/I4210162098","display_name":"Athens Information Technology","ror":"https://ror.org/05eqt7s39","country_code":"GR","type":"nonprofit","lineage":["https://openalex.org/I4210162098"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Antonis Kalis","raw_affiliation_strings":["Athens Information Technology Center, Piraeus, Greece","[Athens Information Technology Center, Piraeus, Greece]"],"affiliations":[{"raw_affiliation_string":"Athens Information Technology Center, Piraeus, Greece","institution_ids":["https://openalex.org/I4210162098"]},{"raw_affiliation_string":"[Athens Information Technology Center, Piraeus, Greece]","institution_ids":["https://openalex.org/I4210162098"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5033473631","display_name":"Constantinos B. Papadias","orcid":"https://orcid.org/0000-0002-0894-5856"},"institutions":[{"id":"https://openalex.org/I4210162098","display_name":"Athens Information Technology","ror":"https://ror.org/05eqt7s39","country_code":"GR","type":"nonprofit","lineage":["https://openalex.org/I4210162098"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Constantinos Papadias","raw_affiliation_strings":["Athens Information Technology Center, Piraeus, Greece","[Athens Information Technology Center, Piraeus, Greece]"],"affiliations":[{"raw_affiliation_string":"Athens Information Technology Center, Piraeus, Greece","institution_ids":["https://openalex.org/I4210162098"]},{"raw_affiliation_string":"[Athens Information Technology Center, Piraeus, Greece]","institution_ids":["https://openalex.org/I4210162098"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5055502592"],"corresponding_institution_ids":["https://openalex.org/I154757721"],"apc_list":null,"apc_paid":null,"fwci":0.5982,"has_fulltext":false,"cited_by_count":5,"citation_normalized_percentile":{"value":0.71991824,"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":"1","last_page":"5"},"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/T11392","display_name":"Energy Harvesting in Wireless Networks","score":0.9991000294685364,"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":0.9980000257492065,"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/mimo","display_name":"MIMO","score":0.891899824142456},{"id":"https://openalex.org/keywords/3g-mimo","display_name":"3G MIMO","score":0.6746054887771606},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6561071872711182},{"id":"https://openalex.org/keywords/multi-user-mimo","display_name":"Multi-user MIMO","score":0.6040552258491516},{"id":"https://openalex.org/keywords/spectral-efficiency","display_name":"Spectral efficiency","score":0.5926343202590942},{"id":"https://openalex.org/keywords/transceiver","display_name":"Transceiver","score":0.5408653616905212},{"id":"https://openalex.org/keywords/feedback-loop","display_name":"Feedback loop","score":0.49840331077575684},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.46765273809432983},{"id":"https://openalex.org/keywords/communications-system","display_name":"Communications system","score":0.4584919512271881},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.44570836424827576},{"id":"https://openalex.org/keywords/antenna","display_name":"Antenna (radio)","score":0.431254118680954},{"id":"https://openalex.org/keywords/spatial-multiplexing","display_name":"Spatial multiplexing","score":0.42613595724105835},{"id":"https://openalex.org/keywords/computer-engineering","display_name":"Computer engineering","score":0.4008380174636841},{"id":"https://openalex.org/keywords/computer-architecture","display_name":"Computer architecture","score":0.37744027376174927},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2789621949195862},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.27716147899627686},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.20129770040512085}],"concepts":[{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.891899824142456},{"id":"https://openalex.org/C165650700","wikidata":"https://www.wikidata.org/wiki/Q4636347","display_name":"3G MIMO","level":4,"score":0.6746054887771606},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6561071872711182},{"id":"https://openalex.org/C91330434","wikidata":"https://www.wikidata.org/wiki/Q738298","display_name":"Multi-user MIMO","level":4,"score":0.6040552258491516},{"id":"https://openalex.org/C137246740","wikidata":"https://www.wikidata.org/wiki/Q583970","display_name":"Spectral efficiency","level":3,"score":0.5926343202590942},{"id":"https://openalex.org/C7720470","wikidata":"https://www.wikidata.org/wiki/Q954187","display_name":"Transceiver","level":3,"score":0.5408653616905212},{"id":"https://openalex.org/C186886427","wikidata":"https://www.wikidata.org/wiki/Q5441213","display_name":"Feedback loop","level":2,"score":0.49840331077575684},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.46765273809432983},{"id":"https://openalex.org/C101765175","wikidata":"https://www.wikidata.org/wiki/Q577764","display_name":"Communications system","level":2,"score":0.4584919512271881},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.44570836424827576},{"id":"https://openalex.org/C21822782","wikidata":"https://www.wikidata.org/wiki/Q131214","display_name":"Antenna (radio)","level":2,"score":0.431254118680954},{"id":"https://openalex.org/C85884896","wikidata":"https://www.wikidata.org/wiki/Q7574075","display_name":"Spatial multiplexing","level":4,"score":0.42613595724105835},{"id":"https://openalex.org/C113775141","wikidata":"https://www.wikidata.org/wiki/Q428691","display_name":"Computer engineering","level":1,"score":0.4008380174636841},{"id":"https://openalex.org/C118524514","wikidata":"https://www.wikidata.org/wiki/Q173212","display_name":"Computer architecture","level":1,"score":0.37744027376174927},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2789621949195862},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.27716147899627686},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.20129770040512085},{"id":"https://openalex.org/C38652104","wikidata":"https://www.wikidata.org/wiki/Q3510521","display_name":"Computer security","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/vetecs.2009.5073444","is_oa":false,"landing_page_url":"https://doi.org/10.1109/vetecs.2009.5073444","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Industry, innovation and infrastructure","id":"https://metadata.un.org/sdg/9","score":0.4099999964237213}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":10,"referenced_works":["https://openalex.org/W1508642566","https://openalex.org/W1990318018","https://openalex.org/W2111299009","https://openalex.org/W2121485091","https://openalex.org/W2128865660","https://openalex.org/W2132153083","https://openalex.org/W2141928109","https://openalex.org/W2143020089","https://openalex.org/W2151180701","https://openalex.org/W2158508801"],"related_works":["https://openalex.org/W1996130034","https://openalex.org/W4321844144","https://openalex.org/W4200145345","https://openalex.org/W1500439066","https://openalex.org/W1561113522","https://openalex.org/W2159343473","https://openalex.org/W4380147564","https://openalex.org/W1574498476","https://openalex.org/W1905709045","https://openalex.org/W1987148101"],"abstract_inverted_index":{"Multiple":[0],"input-multiple":[1],"output":[2],"(MIMO)":[3],"systems":[4,24,39,67],"have":[5,68,79],"drawn":[6],"remarkable":[7],"interest":[8],"in":[9,83],"recent":[10],"years,":[11],"since":[12],"they":[13,78],"are":[14],"known":[15],"to":[16,26],"boost":[17],"the":[18,31,41,51,73,92],"spectral":[19],"efficiency":[20],"of":[21,37,53],"wireless":[22],"communication":[23],"compared":[25],"single":[27],"antenna":[28],"architectures.":[29],"However,":[30],"implementation":[32],"cost":[33],"and":[34,55],"circuit":[35],"complexity":[36,57],"such":[38],"conflicts":[40],"guaranteed":[42],"high":[43],"performance":[44,71],"gain.":[45],"Recent":[46],"research":[47],"efforts":[48],"focus":[49],"on":[50],"investigation":[52],"cheaper":[54],"low":[56],"transceivers,":[58],"introducing":[59],"a":[60],"novel":[61],"beamspace":[62],"MIMO":[63,96],"(BS-MIMO)":[64],"architecture.":[65],"BS-MIMO":[66],"shown":[69],"equivalent":[70],"with":[72],"corresponding":[74],"conventional":[75],"systems,":[76],"while":[77],"been":[80],"also":[81],"evaluated":[82],"closed":[84,93],"loop":[85,94],"environments.":[86],"In":[87],"this":[88],"paper":[89],"we":[90],"extend":[91],"BS":[95],"approach":[97],"presenting":[98],"advanced":[99],"limited":[100],"feedback":[101,106],"techniques":[102],"which":[103],"outperform":[104],"predecessor":[105],"schemes.":[107]},"counts_by_year":[{"year":2013,"cited_by_count":3},{"year":2012,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}