{"id":"https://openalex.org/W4414535421","doi":"https://doi.org/10.1109/icc52391.2025.11161845","title":"Grant-Free Random Access in Uplink LEO Satellite Communications with OFDM","display_name":"Grant-Free Random Access in Uplink LEO Satellite Communications with OFDM","publication_year":2025,"publication_date":"2025-06-08","ids":{"openalex":"https://openalex.org/W4414535421","doi":"https://doi.org/10.1109/icc52391.2025.11161845"},"language":"en","primary_location":{"id":"doi:10.1109/icc52391.2025.11161845","is_oa":false,"landing_page_url":"https://doi.org/10.1109/icc52391.2025.11161845","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ICC 2025 - IEEE International Conference on 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/A5074962077","display_name":"Rui Mao","orcid":null},"institutions":[{"id":"https://openalex.org/I183067930","display_name":"Shanghai Jiao Tong University","ror":"https://ror.org/0220qvk04","country_code":"CN","type":"education","lineage":["https://openalex.org/I183067930"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Rui Mao","raw_affiliation_strings":["Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240"],"affiliations":[{"raw_affiliation_string":"Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240","institution_ids":["https://openalex.org/I183067930"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5065362219","display_name":"Yongpeng Wu","orcid":"https://orcid.org/0000-0001-8210-5057"},"institutions":[{"id":"https://openalex.org/I183067930","display_name":"Shanghai Jiao Tong University","ror":"https://ror.org/0220qvk04","country_code":"CN","type":"education","lineage":["https://openalex.org/I183067930"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yongpeng Wu","raw_affiliation_strings":["Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240"],"affiliations":[{"raw_affiliation_string":"Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240","institution_ids":["https://openalex.org/I183067930"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5006781087","display_name":"Boxiao Shen","orcid":"https://orcid.org/0000-0003-4510-8843"},"institutions":[{"id":"https://openalex.org/I183067930","display_name":"Shanghai Jiao Tong University","ror":"https://ror.org/0220qvk04","country_code":"CN","type":"education","lineage":["https://openalex.org/I183067930"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Boxiao Shen","raw_affiliation_strings":["Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240"],"affiliations":[{"raw_affiliation_string":"Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240","institution_ids":["https://openalex.org/I183067930"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5016154330","display_name":"Symeon Chatzinotas","orcid":"https://orcid.org/0000-0001-5122-0001"},"institutions":[{"id":"https://openalex.org/I186903577","display_name":"University of Luxembourg","ror":"https://ror.org/036x5ad56","country_code":"LU","type":"education","lineage":["https://openalex.org/I186903577"]}],"countries":["LU"],"is_corresponding":false,"raw_author_name":"Symeon Chatzinotas","raw_affiliation_strings":["University of Luxembourg,Interdisciplinary Center for Security, Reliability and Trust (SnT),Luxembourg City,Luxembourg,1855"],"affiliations":[{"raw_affiliation_string":"University of Luxembourg,Interdisciplinary Center for Security, Reliability and Trust (SnT),Luxembourg City,Luxembourg,1855","institution_ids":["https://openalex.org/I186903577"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5080037825","display_name":"Bj\u00f6rn Ottersten","orcid":"https://orcid.org/0000-0003-2298-6774"},"institutions":[{"id":"https://openalex.org/I186903577","display_name":"University of Luxembourg","ror":"https://ror.org/036x5ad56","country_code":"LU","type":"education","lineage":["https://openalex.org/I186903577"]}],"countries":["LU"],"is_corresponding":false,"raw_author_name":"Bj\u00f6rn Ottersten","raw_affiliation_strings":["University of Luxembourg,Interdisciplinary Center for Security, Reliability and Trust (SnT),Luxembourg City,Luxembourg,1855"],"affiliations":[{"raw_affiliation_string":"University of Luxembourg,Interdisciplinary Center for Security, Reliability and Trust (SnT),Luxembourg City,Luxembourg,1855","institution_ids":["https://openalex.org/I186903577"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5100447806","display_name":"Wenjun Zhang","orcid":"https://orcid.org/0000-0001-8799-1182"},"institutions":[{"id":"https://openalex.org/I183067930","display_name":"Shanghai Jiao Tong University","ror":"https://ror.org/0220qvk04","country_code":"CN","type":"education","lineage":["https://openalex.org/I183067930"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Wenjun Zhang","raw_affiliation_strings":["Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240"],"affiliations":[{"raw_affiliation_string":"Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240","institution_ids":["https://openalex.org/I183067930"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":6,"corresponding_author_ids":["https://openalex.org/A5074962077"],"corresponding_institution_ids":["https://openalex.org/I183067930"],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.35522238,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"1225","last_page":"1230"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12042","display_name":"Satellite Communication Systems","score":0.9966999888420105,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace 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/T12042","display_name":"Satellite Communication Systems","score":0.9966999888420105,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace 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/T11701","display_name":"Space Satellite Systems and Control","score":0.9740999937057495,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace 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/T12079","display_name":"IoT Networks and Protocols","score":0.9729999899864197,"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/telecommunications-link","display_name":"Telecommunications link","score":0.739300012588501},{"id":"https://openalex.org/keywords/random-access","display_name":"Random access","score":0.6819000244140625},{"id":"https://openalex.org/keywords/orthogonal-frequency-division-multiplexing","display_name":"Orthogonal frequency-division multiplexing","score":0.6585999727249146},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.6223000288009644},{"id":"https://openalex.org/keywords/transmission","display_name":"Transmission (telecommunications)","score":0.48570001125335693},{"id":"https://openalex.org/keywords/communications-satellite","display_name":"Communications satellite","score":0.47440001368522644},{"id":"https://openalex.org/keywords/satellite","display_name":"Satellite","score":0.46959999203681946},{"id":"https://openalex.org/keywords/multiplexing","display_name":"Multiplexing","score":0.4406000077724457},{"id":"https://openalex.org/keywords/joint","display_name":"Joint (building)","score":0.3935999870300293},{"id":"https://openalex.org/keywords/doppler-effect","display_name":"Doppler effect","score":0.37610000371932983}],"concepts":[{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.739300012588501},{"id":"https://openalex.org/C101722063","wikidata":"https://www.wikidata.org/wiki/Q218825","display_name":"Random access","level":2,"score":0.6819000244140625},{"id":"https://openalex.org/C40409654","wikidata":"https://www.wikidata.org/wiki/Q375889","display_name":"Orthogonal frequency-division multiplexing","level":3,"score":0.6585999727249146},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6456000208854675},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.6223000288009644},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.5077000260353088},{"id":"https://openalex.org/C761482","wikidata":"https://www.wikidata.org/wiki/Q118093","display_name":"Transmission (telecommunications)","level":2,"score":0.48570001125335693},{"id":"https://openalex.org/C121308736","wikidata":"https://www.wikidata.org/wiki/Q149918","display_name":"Communications satellite","level":3,"score":0.47440001368522644},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.46959999203681946},{"id":"https://openalex.org/C19275194","wikidata":"https://www.wikidata.org/wiki/Q222903","display_name":"Multiplexing","level":2,"score":0.4406000077724457},{"id":"https://openalex.org/C18555067","wikidata":"https://www.wikidata.org/wiki/Q8375051","display_name":"Joint (building)","level":2,"score":0.3935999870300293},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3880000114440918},{"id":"https://openalex.org/C142757262","wikidata":"https://www.wikidata.org/wiki/Q76436","display_name":"Doppler effect","level":2,"score":0.37610000371932983},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.36899998784065247},{"id":"https://openalex.org/C90652560","wikidata":"https://www.wikidata.org/wiki/Q11091747","display_name":"Minimum mean square error","level":3,"score":0.3671000003814697},{"id":"https://openalex.org/C159886148","wikidata":"https://www.wikidata.org/wiki/Q176645","display_name":"Markov process","level":2,"score":0.3652999997138977},{"id":"https://openalex.org/C130946814","wikidata":"https://www.wikidata.org/wiki/Q5988271","display_name":"MIMO-OFDM","level":4,"score":0.3416999876499176},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.34049999713897705},{"id":"https://openalex.org/C123079801","wikidata":"https://www.wikidata.org/wiki/Q750240","display_name":"Modulation (music)","level":2,"score":0.33739998936653137},{"id":"https://openalex.org/C56296756","wikidata":"https://www.wikidata.org/wiki/Q840922","display_name":"Bit error rate","level":3,"score":0.3345000147819519},{"id":"https://openalex.org/C186370098","wikidata":"https://www.wikidata.org/wiki/Q442787","display_name":"Energy (signal processing)","level":2,"score":0.32420000433921814},{"id":"https://openalex.org/C12426560","wikidata":"https://www.wikidata.org/wiki/Q189569","display_name":"Basis (linear algebra)","level":2,"score":0.3231000006198883},{"id":"https://openalex.org/C2775980084","wikidata":"https://www.wikidata.org/wiki/Q4771249","display_name":"Planar array","level":2,"score":0.3221000134944916},{"id":"https://openalex.org/C157764524","wikidata":"https://www.wikidata.org/wiki/Q1383412","display_name":"Throughput","level":3,"score":0.3149999976158142},{"id":"https://openalex.org/C89061704","wikidata":"https://www.wikidata.org/wiki/Q5555726","display_name":"Frequency-division multiplexing","level":4,"score":0.2890999913215637},{"id":"https://openalex.org/C139945424","wikidata":"https://www.wikidata.org/wiki/Q1940696","display_name":"Mean squared error","level":2,"score":0.2709999978542328},{"id":"https://openalex.org/C98763669","wikidata":"https://www.wikidata.org/wiki/Q176645","display_name":"Markov chain","level":2,"score":0.26570001244544983},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.26019999384880066},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.25929999351501465},{"id":"https://openalex.org/C8642999","wikidata":"https://www.wikidata.org/wiki/Q4171168","display_name":"Hyperparameter","level":2,"score":0.25760000944137573},{"id":"https://openalex.org/C167928553","wikidata":"https://www.wikidata.org/wiki/Q1376021","display_name":"Estimation theory","level":2,"score":0.2558000087738037},{"id":"https://openalex.org/C163836022","wikidata":"https://www.wikidata.org/wiki/Q6771326","display_name":"Markov model","level":3,"score":0.2531999945640564},{"id":"https://openalex.org/C557945733","wikidata":"https://www.wikidata.org/wiki/Q389772","display_name":"Data transmission","level":2,"score":0.25189998745918274}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/icc52391.2025.11161845","is_oa":false,"landing_page_url":"https://doi.org/10.1109/icc52391.2025.11161845","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ICC 2025 - IEEE International Conference on Communications","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W2046553641","https://openalex.org/W2071284784","https://openalex.org/W2109155033","https://openalex.org/W2167208435","https://openalex.org/W2248880694","https://openalex.org/W2543631487","https://openalex.org/W2890736047","https://openalex.org/W2945463326","https://openalex.org/W3032755566","https://openalex.org/W3210050257","https://openalex.org/W4226242403","https://openalex.org/W4312629554","https://openalex.org/W4360996675","https://openalex.org/W4362005642","https://openalex.org/W4402509581","https://openalex.org/W4406321277"],"related_works":[],"abstract_inverted_index":{"This":[0],"paper":[1],"investigates":[2],"joint":[3],"device":[4],"activity":[5,152],"detection":[6],"and":[7,102,155],"channel":[8,79,112,156],"estimation":[9,98,157],"for":[10],"grant-free":[11],"random":[12,105],"access":[13],"in":[14,125,149],"Lowearth":[15],"orbit":[16],"(LEO)":[17],"satellite":[18,32],"communications.":[19],"We":[20],"consider":[21],"uplink":[22],"communications":[23],"from":[24],"multiple":[25,40],"single-antenna":[26],"terrestrial":[27],"users":[28],"to":[29,73,91,109,121],"a":[30,35,57],"LEO":[31],"equipped":[33],"with":[34],"uniform":[36],"planar":[37],"array":[38],"of":[39,77,99,135,151],"antennas,":[41],"where":[42,62],"orthogonal":[43],"frequency":[44],"division":[45],"multiplexing":[46],"(OFDM)":[47],"modulation":[48],"is":[49,60,71,89,107,119],"adopted.":[50],"To":[51],"combat":[52],"the":[53,63,75,82,93,100,103,111,115,123,136,143],"severe":[54],"Doppler":[55],"shift,":[56],"transmission":[58],"scheme":[59],"proposed,":[61],"discrete":[64],"prolate":[65],"spheroidal":[66],"basis":[67],"expansion":[68],"model":[69],"(DPS-BEM)":[70],"introduced":[72],"reduce":[74],"number":[76],"unknown":[78],"parameters.":[80],"Then":[81],"vector":[83],"approximate":[84,92],"message":[85],"passing":[86],"(VAMP)":[87],"algorithm":[88],"employed":[90],"minimum":[94],"mean":[95],"square":[96],"error":[97,153],"channel,":[101],"Markov":[104],"field":[106],"combined":[108],"capture":[110],"sparsity.":[113],"Meanwhile,":[114],"expectation-maximization":[116],"(EM)":[117],"approach":[118],"integrated":[120],"learn":[122],"hyperparameters":[124],"priors.":[126],"Finally,":[127],"active":[128],"devices":[129],"are":[130],"detected":[131],"by":[132],"calculating":[133],"energy":[134],"estimated":[137],"channel.":[138],"Simulation":[139],"results":[140],"demonstrate":[141],"that":[142],"proposed":[144],"method":[145],"outperforms":[146],"conventional":[147],"algorithms":[148],"terms":[150],"rate":[154],"precision.":[158]},"counts_by_year":[],"updated_date":"2026-03-07T16:01:11.037858","created_date":"2025-10-10T00:00:00"}