{"id":"https://openalex.org/W1985196726","doi":"https://doi.org/10.1109/glocom.2011.6134231","title":"Joint Frequency Synchronization and Spectrum Occupancy Characterization in OFDM-Based Cognitive Radio Systems","display_name":"Joint Frequency Synchronization and Spectrum Occupancy Characterization in OFDM-Based Cognitive Radio Systems","publication_year":2011,"publication_date":"2011-12-01","ids":{"openalex":"https://openalex.org/W1985196726","doi":"https://doi.org/10.1109/glocom.2011.6134231","mag":"1985196726"},"language":"en","primary_location":{"id":"doi:10.1109/glocom.2011.6134231","is_oa":false,"landing_page_url":"https://doi.org/10.1109/glocom.2011.6134231","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2011 IEEE Global Telecommunications Conference - GLOBECOM 2011","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/A5015851515","display_name":"Mladen \u017divkovi\u0107","orcid":"https://orcid.org/0000-0001-9662-0519"},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"M. Zivkovic","raw_affiliation_strings":["Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany","Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany"],"affiliations":[{"raw_affiliation_string":"Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]},{"raw_affiliation_string":"Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5066277118","display_name":"Rudolf Mathar","orcid":"https://orcid.org/0000-0002-9585-605X"},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"R. Mathar","raw_affiliation_strings":["Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany","Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany"],"affiliations":[{"raw_affiliation_string":"Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]},{"raw_affiliation_string":"Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5015851515"],"corresponding_institution_ids":["https://openalex.org/I887968799"],"apc_list":null,"apc_paid":null,"fwci":0.8098,"has_fulltext":false,"cited_by_count":4,"citation_normalized_percentile":{"value":0.74933495,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"6","issue":null,"first_page":"1","last_page":"6"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10125","display_name":"Advanced Wireless Communication Techniques","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/T10125","display_name":"Advanced Wireless Communication Techniques","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/T11873","display_name":"PAPR reduction in OFDM","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/T12146","display_name":"Power Line Communications and Noise","score":0.9997000098228455,"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/cognitive-radio","display_name":"Cognitive radio","score":0.8725954294204712},{"id":"https://openalex.org/keywords/orthogonal-frequency-division-multiplexing","display_name":"Orthogonal frequency-division multiplexing","score":0.7949725389480591},{"id":"https://openalex.org/keywords/synchronization","display_name":"Synchronization (alternating current)","score":0.6931523680686951},{"id":"https://openalex.org/keywords/preamble","display_name":"Preamble","score":0.6751961708068848},{"id":"https://openalex.org/keywords/frequency-offset","display_name":"Frequency offset","score":0.6623581051826477},{"id":"https://openalex.org/keywords/bandwidth","display_name":"Bandwidth (computing)","score":0.633707582950592},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.600196361541748},{"id":"https://openalex.org/keywords/carrier-frequency-offset","display_name":"Carrier frequency offset","score":0.5962579846382141},{"id":"https://openalex.org/keywords/spectral-efficiency","display_name":"Spectral efficiency","score":0.5771628022193909},{"id":"https://openalex.org/keywords/interference","display_name":"Interference (communication)","score":0.5208923816680908},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.47983285784721375},{"id":"https://openalex.org/keywords/radio-spectrum","display_name":"Radio spectrum","score":0.4563584327697754},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2970762848854065},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.2035389542579651},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.2026273012161255}],"concepts":[{"id":"https://openalex.org/C149946192","wikidata":"https://www.wikidata.org/wiki/Q3235733","display_name":"Cognitive radio","level":3,"score":0.8725954294204712},{"id":"https://openalex.org/C40409654","wikidata":"https://www.wikidata.org/wiki/Q375889","display_name":"Orthogonal frequency-division multiplexing","level":3,"score":0.7949725389480591},{"id":"https://openalex.org/C2778562939","wikidata":"https://www.wikidata.org/wiki/Q1298791","display_name":"Synchronization (alternating current)","level":3,"score":0.6931523680686951},{"id":"https://openalex.org/C2780691134","wikidata":"https://www.wikidata.org/wiki/Q1129448","display_name":"Preamble","level":3,"score":0.6751961708068848},{"id":"https://openalex.org/C49319798","wikidata":"https://www.wikidata.org/wiki/Q5502874","display_name":"Frequency offset","level":4,"score":0.6623581051826477},{"id":"https://openalex.org/C2776257435","wikidata":"https://www.wikidata.org/wiki/Q1576430","display_name":"Bandwidth (computing)","level":2,"score":0.633707582950592},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.600196361541748},{"id":"https://openalex.org/C2776108382","wikidata":"https://www.wikidata.org/wiki/Q25111451","display_name":"Carrier frequency offset","level":5,"score":0.5962579846382141},{"id":"https://openalex.org/C137246740","wikidata":"https://www.wikidata.org/wiki/Q583970","display_name":"Spectral efficiency","level":3,"score":0.5771628022193909},{"id":"https://openalex.org/C32022120","wikidata":"https://www.wikidata.org/wiki/Q797225","display_name":"Interference (communication)","level":3,"score":0.5208923816680908},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.47983285784721375},{"id":"https://openalex.org/C92545706","wikidata":"https://www.wikidata.org/wiki/Q902174","display_name":"Radio spectrum","level":2,"score":0.4563584327697754},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2970762848854065},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.2035389542579651},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.2026273012161255},{"id":"https://openalex.org/C54197355","wikidata":"https://www.wikidata.org/wiki/Q5782992","display_name":"Beamforming","level":2,"score":0.0},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1109/glocom.2011.6134231","is_oa":false,"landing_page_url":"https://doi.org/10.1109/glocom.2011.6134231","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2011 IEEE Global Telecommunications Conference - GLOBECOM 2011","raw_type":"proceedings-article"},{"id":"pmh:oai:publications.rwth-aachen.de:128435","is_oa":false,"landing_page_url":"https://publications.rwth-aachen.de/record/128435","pdf_url":null,"source":{"id":"https://openalex.org/S4306401362","display_name":"RWTH Publications (RWTH Aachen)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I887968799","host_organization_name":"RWTH Aachen University","host_organization_lineage":["https://openalex.org/I887968799"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"2011 IEEE Global Telecommunications Conference : GLOBECOM 2011 ; Houston, Texas, USA, 5 - 9 December 2011 / [IEEE Communications Society]. - Vol. 1-7<br/>2011 IEEE Global Telecommunications Conference, GLOBECOM 2011, Houston, TX, USA, 2011-12-05 - 2011-12-09","raw_type":"info:eu-repo/semantics/publishedVersion"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/7","display_name":"Affordable and clean energy","score":0.8899999856948853}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":9,"referenced_works":["https://openalex.org/W1981112682","https://openalex.org/W2010465803","https://openalex.org/W2100406919","https://openalex.org/W2100500752","https://openalex.org/W2101159382","https://openalex.org/W2136403873","https://openalex.org/W2159043079","https://openalex.org/W2162775304","https://openalex.org/W2168078104"],"related_works":["https://openalex.org/W2033692824","https://openalex.org/W2122124862","https://openalex.org/W2789593045","https://openalex.org/W2107432979","https://openalex.org/W2163799874","https://openalex.org/W2142667235","https://openalex.org/W2012008483","https://openalex.org/W2010378487","https://openalex.org/W2110234499","https://openalex.org/W2152587671"],"abstract_inverted_index":{"OFDM-based":[0,82],"cognitive":[1],"radio":[2],"(CR)":[3],"systems":[4,52,84],"are":[5],"shown":[6],"to":[7,35,40,96,102,108],"be":[8,54],"an":[9],"effective":[10],"solution":[11],"for":[12,81,129],"increasing":[13],"spectrum":[14,77,120,133],"efficiency":[15,49],"by":[16],"activating":[17],"the":[18,64],"certain":[19],"group":[20],"of":[21,50,63,119,124,132],"subcarriers":[22],"(subbands)":[23],"in":[24,94],"locally":[25],"available":[26],"spectrum.":[27],"However,":[28],"each":[29,57],"CR":[30,51,58,83],"receiver":[31],"should":[32],"synchronize":[33],"itself":[34],"appropriate":[36],"carrier":[37],"frequency":[38,74,99],"and":[39,47,76,111,135],"identify":[41,103],"currently":[42],"activated":[43],"subbands.":[44],"Moreover,":[45],"energy":[46],"bandwidth":[48],"can":[53],"improved":[55],"if":[56],"could":[59],"provide":[60,109],"additional":[61],"characterization":[62,79],"local":[65],"spectral":[66],"content.":[67],"In":[68],"this":[69],"paper":[70],"a":[71],"novel":[72],"joint":[73],"synchronization":[75,88],"occupancy":[78,134],"method":[80,126],"is":[85,91,127],"proposed.":[86],"The":[87,122],"preamble":[89],"structure":[90],"appropriately":[92],"modified":[93],"order":[95],"efficiently":[97],"perform":[98],"offset":[100],"estimation,":[101],"occupied":[104],"subbands,":[105],"and,":[106],"finally,":[107],"SNR":[110],"interference":[112,136],"power":[113],"estimates":[114],"as":[115],"reliable":[116],"quantitative":[117],"indicators":[118],"occupancy.":[121],"performance":[123],"proposed":[125],"evaluated":[128],"different":[130],"amounts":[131],"levels.":[137]},"counts_by_year":[{"year":2016,"cited_by_count":1},{"year":2013,"cited_by_count":1},{"year":2012,"cited_by_count":1}],"updated_date":"2026-04-04T16:13:02.066488","created_date":"2025-10-10T00:00:00"}