{"id":"https://openalex.org/W4409257663","doi":"https://doi.org/10.1109/twc.2025.3556873","title":"OTFS-SDMA for Massive Grant-Free Random Access in LEO Satellite Internet of Things","display_name":"OTFS-SDMA for Massive Grant-Free Random Access in LEO Satellite Internet of Things","publication_year":2025,"publication_date":"2025-04-08","ids":{"openalex":"https://openalex.org/W4409257663","doi":"https://doi.org/10.1109/twc.2025.3556873"},"language":"en","primary_location":{"id":"doi:10.1109/twc.2025.3556873","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2025.3556873","pdf_url":null,"source":{"id":"https://openalex.org/S63459445","display_name":"IEEE Transactions on Wireless Communications","issn_l":"1536-1276","issn":["1536-1276","1558-2248"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Wireless Communications","raw_type":"journal-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/A5066870974","display_name":"Qu Ren","orcid":null},"institutions":[{"id":"https://openalex.org/I149594827","display_name":"Xidian University","ror":"https://ror.org/05s92vm98","country_code":"CN","type":"education","lineage":["https://openalex.org/I149594827"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Qiqi Ren","raw_affiliation_strings":["School of Telecommunications Engineering, Xidian University, Xi’an, China","State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China"],"affiliations":[{"raw_affiliation_string":"School of Telecommunications Engineering, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]},{"raw_affiliation_string":"State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100414362","display_name":"Ying Li","orcid":"https://orcid.org/0000-0002-9604-2664"},"institutions":[{"id":"https://openalex.org/I149594827","display_name":"Xidian University","ror":"https://ror.org/05s92vm98","country_code":"CN","type":"education","lineage":["https://openalex.org/I149594827"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Ying Li","raw_affiliation_strings":["School of Telecommunications Engineering, Xidian University, Xi’an, China","State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China"],"affiliations":[{"raw_affiliation_string":"School of Telecommunications Engineering, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]},{"raw_affiliation_string":"State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5044882430","display_name":"Zhaoji Zhang","orcid":"https://orcid.org/0000-0003-4432-3760"},"institutions":[{"id":"https://openalex.org/I149594827","display_name":"Xidian University","ror":"https://ror.org/05s92vm98","country_code":"CN","type":"education","lineage":["https://openalex.org/I149594827"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Zhaoji Zhang","raw_affiliation_strings":["School of Telecommunications Engineering, Xidian University, Xi’an, China","State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China"],"affiliations":[{"raw_affiliation_string":"School of Telecommunications Engineering, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]},{"raw_affiliation_string":"State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China","institution_ids":["https://openalex.org/I149594827"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5056769144","display_name":"Shan Lu","orcid":"https://orcid.org/0000-0002-9837-5606"},"institutions":[{"id":"https://openalex.org/I60134161","display_name":"Nagoya University","ror":"https://ror.org/04chrp450","country_code":"JP","type":"education","lineage":["https://openalex.org/I60134161"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Shan Lu","raw_affiliation_strings":["Department of Information and Communication Engineering, Nagoya University, Nagoya, Japan","Department of Information and Communication Engineering, Nagoya University, Japan"],"affiliations":[{"raw_affiliation_string":"Department of Information and Communication Engineering, Nagoya University, Nagoya, Japan","institution_ids":["https://openalex.org/I60134161"]},{"raw_affiliation_string":"Department of Information and Communication Engineering, Nagoya University, Japan","institution_ids":["https://openalex.org/I60134161"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5066870974"],"corresponding_institution_ids":["https://openalex.org/I149594827"],"apc_list":null,"apc_paid":null,"fwci":5.1063,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.93556769,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":96,"max":98},"biblio":{"volume":"24","issue":"8","first_page":"6902","last_page":"6916"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12042","display_name":"Satellite Communication Systems","score":0.9908000230789185,"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":0.9908000230789185,"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/T10575","display_name":"Wireless Communication Networks Research","score":0.9839000105857849,"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"}},{"id":"https://openalex.org/T12079","display_name":"IoT Networks and Protocols","score":0.9728000164031982,"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/computer-science","display_name":"Computer science","score":0.6347450017929077},{"id":"https://openalex.org/keywords/satellite","display_name":"Satellite","score":0.5445390939712524},{"id":"https://openalex.org/keywords/random-access","display_name":"Random access","score":0.45887720584869385},{"id":"https://openalex.org/keywords/the-internet","display_name":"The Internet","score":0.4153881371021271},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.3960282504558563},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.36833426356315613},{"id":"https://openalex.org/keywords/world-wide-web","display_name":"World Wide Web","score":0.15937727689743042},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.10927799344062805}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6347450017929077},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.5445390939712524},{"id":"https://openalex.org/C101722063","wikidata":"https://www.wikidata.org/wiki/Q218825","display_name":"Random access","level":2,"score":0.45887720584869385},{"id":"https://openalex.org/C110875604","wikidata":"https://www.wikidata.org/wiki/Q75","display_name":"The Internet","level":2,"score":0.4153881371021271},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.3960282504558563},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.36833426356315613},{"id":"https://openalex.org/C136764020","wikidata":"https://www.wikidata.org/wiki/Q466","display_name":"World Wide Web","level":1,"score":0.15937727689743042},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.10927799344062805},{"id":"https://openalex.org/C146978453","wikidata":"https://www.wikidata.org/wiki/Q3798668","display_name":"Aerospace engineering","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/twc.2025.3556873","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2025.3556873","pdf_url":null,"source":{"id":"https://openalex.org/S63459445","display_name":"IEEE Transactions on Wireless Communications","issn_l":"1536-1276","issn":["1536-1276","1558-2248"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Wireless Communications","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G2394140253","display_name":null,"funder_award_id":"62131016","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"},{"id":"https://openalex.org/G940974447","display_name":null,"funder_award_id":"62471363","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"}],"funders":[{"id":"https://openalex.org/F4320321001","display_name":"National Natural Science Foundation of China","ror":"https://ror.org/01h0zpd94"},{"id":"https://openalex.org/F4320325763","display_name":"Telecommunications Advancement Foundation","ror":"https://ror.org/05y77zf79"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":48,"referenced_works":["https://openalex.org/W1997834106","https://openalex.org/W2111211848","https://openalex.org/W2117890770","https://openalex.org/W2144136361","https://openalex.org/W2152600927","https://openalex.org/W2467524786","https://openalex.org/W2612254130","https://openalex.org/W2706056020","https://openalex.org/W2884333066","https://openalex.org/W2888002205","https://openalex.org/W2962951066","https://openalex.org/W2980231147","https://openalex.org/W2984294778","https://openalex.org/W3007804894","https://openalex.org/W3022137255","https://openalex.org/W3032755566","https://openalex.org/W3080292365","https://openalex.org/W3080804940","https://openalex.org/W3089706104","https://openalex.org/W3099350037","https://openalex.org/W3103408716","https://openalex.org/W3120875796","https://openalex.org/W3134916744","https://openalex.org/W3161771080","https://openalex.org/W3169385106","https://openalex.org/W3178346894","https://openalex.org/W3179283102","https://openalex.org/W3200797369","https://openalex.org/W3210050257","https://openalex.org/W4226168441","https://openalex.org/W4226239314","https://openalex.org/W4226242403","https://openalex.org/W4285222027","https://openalex.org/W4312629554","https://openalex.org/W4312685994","https://openalex.org/W4312810460","https://openalex.org/W4312899363","https://openalex.org/W4315630401","https://openalex.org/W4321016411","https://openalex.org/W4321195607","https://openalex.org/W4362005642","https://openalex.org/W4367280283","https://openalex.org/W4376466507","https://openalex.org/W4381296758","https://openalex.org/W4384080812","https://openalex.org/W4385894332","https://openalex.org/W4391877793","https://openalex.org/W4392152508"],"related_works":["https://openalex.org/W3133183159","https://openalex.org/W2952222336","https://openalex.org/W4297872561","https://openalex.org/W2116633494","https://openalex.org/W3117544412","https://openalex.org/W2888733329","https://openalex.org/W2740103453","https://openalex.org/W2899709827","https://openalex.org/W3194135015","https://openalex.org/W2999087534"],"abstract_inverted_index":{"Low":[0],"earth":[1],"orbit":[2],"(LEO)":[3],"satellite-based":[4],"Internet":[5],"of":[6,98,123,126,229],"Things":[7],"(IoT)":[8],"has":[9],"great":[10],"potential":[11],"to":[12,64,119,156,197,216,224],"provide":[13],"seamless":[14],"global":[15],"coverage,":[16],"but":[17],"the":[18,32,59,66,74,88,96,121,130,140,145,148,158,163,170,186,207,214,226,230,235],"large":[19],"propagation":[20],"delay":[21],"and":[22,40,137,192,206],"severe":[23,109],"Doppler":[24,110,141,146],"shift":[25],"in":[26,162,211],"terrestrial-satellite":[27],"link":[28],"(TSL)":[29],"will":[30],"become":[31],"most":[33],"challenging":[34],"problem.":[35],"To":[36,102],"handle":[37],"these":[38],"challenges":[39],"facilitate":[41,103],"massive":[42],"grant-free":[43],"random":[44],"access,":[45],"we":[46,76,112,173],"propose":[47,78,174],"an":[48],"orthogonal":[49,149],"time":[50],"frequency":[51],"space-based":[52],"scramble-division":[53],"multiple":[54,132],"access":[55],"(OTFS-SDMA)":[56],"scheme,":[57,172],"where":[58],"scrambling":[60,194],"technique":[61],"is":[62,154],"used":[63,155],"tackle":[65],"correlated":[67,203],"TSL":[68,160,204],"channels":[69],"between":[70],"neighboring":[71,199],"devices.":[72],"At":[73],"receiver,":[75],"first":[77],"a":[79,99,175],"user":[80],"activity":[81],"detection":[82,183],"(UAD)":[83],"method":[84],"based":[85],"on":[86,95,144],"capturing":[87],"dominant":[89],"line-of-sight":[90],"(LoS)":[91],"path,":[92],"without":[93],"relying":[94],"assumption":[97],"static":[100],"TSL.":[101],"accurate":[104],"channel":[105,161,208],"estimation":[106],"(CE)":[107],"against":[108],"shifts,":[111],"exploit":[113],"prior":[114],"information":[115],"about":[116],"satellite":[117],"velocity":[118],"detect":[120],"angles":[122],"arrival":[124],"(AoAs)":[125],"active":[127,200],"devices":[128,201],"with":[129,169,202,213],"two-dimensional":[131],"signal":[133,178],"classification":[134],"(2D-MUSIC)":[135],"algorithm,":[136],"further":[138],"estimate":[139,157],"shifts.":[142],"Building":[143],"estimation,":[147],"matching":[150],"pursuit":[151],"(OMP)":[152],"algorithm":[153],"sparse":[159],"time-delay":[164],"(TD)":[165],"domain.":[166],"In":[167,185],"accordance":[168],"OTFS-SDMA":[171,232],"cross-domain":[176],"elementary":[177],"estimator":[179],"(CD-ESE)":[180],"for":[181],"multi-user":[182],"(MUD).":[184],"CD-ESE":[187,215],"MUD":[188,218],"structure,":[189],"both":[190],"bit-level":[191],"symbol-level":[193],"sequences":[195],"help":[196],"distinguish":[198],"channels,":[205],"decoder":[209],"works":[210],"conjunction":[212],"enhance":[217],"accuracy.":[219],"Simulation":[220],"results":[221],"are":[222],"provided":[223],"demonstrate":[225],"superior":[227],"performance":[228],"proposed":[231],"scheme":[233],"over":[234],"state-of-the-art":[236],"solutions.":[237]},"counts_by_year":[{"year":2026,"cited_by_count":1}],"updated_date":"2026-04-09T08:11:56.329763","created_date":"2025-10-10T00:00:00"}