{"id":"https://openalex.org/W3127690891","doi":"https://doi.org/10.1109/twc.2021.3053770","title":"Privacy-Preserving Channel Estimation in Cell-Free Hybrid Massive MIMO Systems","display_name":"Privacy-Preserving Channel Estimation in Cell-Free Hybrid Massive MIMO Systems","publication_year":2021,"publication_date":"2021-01-29","ids":{"openalex":"https://openalex.org/W3127690891","doi":"https://doi.org/10.1109/twc.2021.3053770","mag":"3127690891"},"language":"en","primary_location":{"id":"doi:10.1109/twc.2021.3053770","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2021.3053770","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/A5101985034","display_name":"Jun Xu","orcid":"https://orcid.org/0000-0003-0101-4001"},"institutions":[{"id":"https://openalex.org/I76569877","display_name":"Southeast University","ror":"https://ror.org/04ct4d772","country_code":"CN","type":"education","lineage":["https://openalex.org/I76569877"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Jun Xu","raw_affiliation_strings":["National Mobile Communications Research Laboratory, Southeast University, Nanjing, China"],"raw_orcid":"https://orcid.org/0000-0003-0101-4001","affiliations":[{"raw_affiliation_string":"National Mobile Communications Research Laboratory, Southeast University, Nanjing, China","institution_ids":["https://openalex.org/I76569877"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100382658","display_name":"Xiaodong Wang","orcid":"https://orcid.org/0000-0002-2945-9240"},"institutions":[{"id":"https://openalex.org/I78577930","display_name":"Columbia University","ror":"https://ror.org/00hj8s172","country_code":"US","type":"education","lineage":["https://openalex.org/I78577930"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Xiaodong Wang","raw_affiliation_strings":["Department of Electrical Engineering, Columbia University, New York, NY, USA"],"raw_orcid":"https://orcid.org/0000-0002-2945-9240","affiliations":[{"raw_affiliation_string":"Department of Electrical Engineering, Columbia University, New York, NY, USA","institution_ids":["https://openalex.org/I78577930"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5050166453","display_name":"Pengcheng Zhu","orcid":"https://orcid.org/0000-0001-9867-7041"},"institutions":[{"id":"https://openalex.org/I76569877","display_name":"Southeast University","ror":"https://ror.org/04ct4d772","country_code":"CN","type":"education","lineage":["https://openalex.org/I76569877"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Pengcheng Zhu","raw_affiliation_strings":["National Mobile Communications Research Laboratory, Southeast University, Nanjing, China"],"raw_orcid":"https://orcid.org/0000-0001-9867-7041","affiliations":[{"raw_affiliation_string":"National Mobile Communications Research Laboratory, Southeast University, Nanjing, China","institution_ids":["https://openalex.org/I76569877"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5072916702","display_name":"Xiaohu You","orcid":"https://orcid.org/0000-0002-0809-8511"},"institutions":[{"id":"https://openalex.org/I76569877","display_name":"Southeast University","ror":"https://ror.org/04ct4d772","country_code":"CN","type":"education","lineage":["https://openalex.org/I76569877"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Xiaohu You","raw_affiliation_strings":["National Mobile Communications Research Laboratory, Southeast University, Nanjing, China"],"raw_orcid":"https://orcid.org/0000-0002-0809-8511","affiliations":[{"raw_affiliation_string":"National Mobile Communications Research Laboratory, Southeast University, Nanjing, China","institution_ids":["https://openalex.org/I76569877"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":1.3768,"has_fulltext":false,"cited_by_count":15,"citation_normalized_percentile":{"value":0.80201114,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":91,"max":98},"biblio":{"volume":"20","issue":"6","first_page":"3815","last_page":"3830"},"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/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"}},{"id":"https://openalex.org/T10964","display_name":"Wireless Communication Security Techniques","score":0.9995999932289124,"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":0.6465467214584351},{"id":"https://openalex.org/keywords/estimator","display_name":"Estimator","score":0.5655070543289185},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.5641369223594666},{"id":"https://openalex.org/keywords/telecommunications-link","display_name":"Telecommunications link","score":0.5531179904937744},{"id":"https://openalex.org/keywords/payload","display_name":"Payload (computing)","score":0.5504879355430603},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.5123416185379028},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.47907692193984985},{"id":"https://openalex.org/keywords/singular-value-decomposition","display_name":"Singular value decomposition","score":0.46311986446380615},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.42250511050224304},{"id":"https://openalex.org/keywords/topology","display_name":"Topology (electrical circuits)","score":0.3305938243865967},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.25537651777267456},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.23327729105949402},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.2042497992515564},{"id":"https://openalex.org/keywords/network-packet","display_name":"Network packet","score":0.09584105014801025},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.09199556708335876}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6465467214584351},{"id":"https://openalex.org/C185429906","wikidata":"https://www.wikidata.org/wiki/Q1130160","display_name":"Estimator","level":2,"score":0.5655070543289185},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.5641369223594666},{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.5531179904937744},{"id":"https://openalex.org/C134066672","wikidata":"https://www.wikidata.org/wiki/Q1424639","display_name":"Payload (computing)","level":3,"score":0.5504879355430603},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.5123416185379028},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.47907692193984985},{"id":"https://openalex.org/C22789450","wikidata":"https://www.wikidata.org/wiki/Q420904","display_name":"Singular value decomposition","level":2,"score":0.46311986446380615},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.42250511050224304},{"id":"https://openalex.org/C184720557","wikidata":"https://www.wikidata.org/wiki/Q7825049","display_name":"Topology (electrical circuits)","level":2,"score":0.3305938243865967},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.25537651777267456},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.23327729105949402},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.2042497992515564},{"id":"https://openalex.org/C158379750","wikidata":"https://www.wikidata.org/wiki/Q214111","display_name":"Network packet","level":2,"score":0.09584105014801025},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.09199556708335876}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/twc.2021.3053770","is_oa":false,"landing_page_url":"https://doi.org/10.1109/twc.2021.3053770","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/G3554749734","display_name":"\u57fa\u4e8e\u7f51\u7edc\u5168\u53cc\u5de5\u7684\u5bc6\u96c6\u5206\u5e03\u5f0fMIMO\u65e0\u7ebf\u4f20\u8f93\u7406\u8bba\u4e0e\u6280\u672f\u7814\u7a76","funder_award_id":"61871122","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"},{"id":"https://openalex.org/G4462495405","display_name":"\u5168\u53cc\u5de5\u65e0\u7ebf\u56de\u4f20\u5bc6\u96c6\u5206\u5e03\u5f0fMIMO\u65e0\u7ebf\u901a\u4fe1\u7406\u8bba\u4e0e\u6280\u672f\u7814\u7a76","funder_award_id":"61971127","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"},{"id":"https://openalex.org/G4472654138","display_name":null,"funder_award_id":"BK20180011","funder_id":"https://openalex.org/F4320322769","funder_display_name":"Natural Science Foundation of Jiangsu Province"},{"id":"https://openalex.org/G6069530659","display_name":null,"funder_award_id":"2019YFE0113400","funder_id":"https://openalex.org/F4320335777","funder_display_name":"National Key Research and Development Program 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/F4320322769","display_name":"Natural Science Foundation of Jiangsu Province","ror":"https://ror.org/01h0zpd94"},{"id":"https://openalex.org/F4320335777","display_name":"National Key Research and Development Program of China","ror":null}],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":48,"referenced_works":["https://openalex.org/W905619","https://openalex.org/W602904462","https://openalex.org/W1492459858","https://openalex.org/W1507780841","https://openalex.org/W1873763122","https://openalex.org/W1997690112","https://openalex.org/W2004294022","https://openalex.org/W2005107218","https://openalex.org/W2020679325","https://openalex.org/W2022097286","https://openalex.org/W2027595342","https://openalex.org/W2068712429","https://openalex.org/W2092845654","https://openalex.org/W2101394529","https://openalex.org/W2109706083","https://openalex.org/W2130914270","https://openalex.org/W2136015602","https://openalex.org/W2166074149","https://openalex.org/W2167372639","https://openalex.org/W2318184860","https://openalex.org/W2473418344","https://openalex.org/W2508363235","https://openalex.org/W2547527490","https://openalex.org/W2603533168","https://openalex.org/W2616032753","https://openalex.org/W2620479485","https://openalex.org/W2779248810","https://openalex.org/W2781189798","https://openalex.org/W2887443223","https://openalex.org/W2887892418","https://openalex.org/W2899063420","https://openalex.org/W2915612378","https://openalex.org/W2920749665","https://openalex.org/W2963391443","https://openalex.org/W2963663060","https://openalex.org/W2963741669","https://openalex.org/W2969648422","https://openalex.org/W2978348882","https://openalex.org/W3022363124","https://openalex.org/W3100506612","https://openalex.org/W3103352822","https://openalex.org/W3104871901","https://openalex.org/W4205228770","https://openalex.org/W4235371447","https://openalex.org/W6600043445","https://openalex.org/W6639246211","https://openalex.org/W6680702173","https://openalex.org/W6747444909"],"related_works":["https://openalex.org/W2548963335","https://openalex.org/W2159941915","https://openalex.org/W2962882802","https://openalex.org/W1535080110","https://openalex.org/W2571404653","https://openalex.org/W1995129237","https://openalex.org/W1761601995","https://openalex.org/W4300468626","https://openalex.org/W2097713053","https://openalex.org/W4321608401"],"abstract_inverted_index":{"We":[0,98,141],"consider":[1],"a":[2,70],"cell-free":[3],"hybrid":[4],"massive":[5],"multiple-input":[6],"multiple-output":[7],"(MIMO)":[8],"system":[9],"with":[10,19,55,178],"K":[11,40],"users":[12],"and":[13,25,52,101,135,151,182,190,212],"M":[14],"access":[15],"points":[16],"(APs),":[17],"each":[18],"N":[20,26,31],"<sub":[21,27,32,44],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[22,28,33,45],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">a</sub>":[23,34,46],"antennas":[24],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">r</sub>":[29],"<;":[30,41,42],"radio":[35],"frequency":[36],"(RF)":[37],"chains.":[38],"When":[39],"MN":[43],",":[47],"efficient":[48],"uplink":[49],"channel":[50,104,120,153,213],"estimation":[51,105,154,162,214],"data":[53],"detection":[54],"reduced":[56],"number":[57],"of":[58,95,110,118,186,196],"pilots":[59],"can":[60,164],"be":[61,165],"performed":[62],"based":[63,130],"on":[64,132,145],"low-rank":[65],"matrix":[66,127],"completion.":[67],"However,":[68],"such":[69],"scheme":[71],"requires":[72],"the":[73,88,92,108,115,119,146,149,152,161,169,175,183,188,208],"central":[74],"processing":[75],"unit":[76],"(CPU)":[77],"to":[78,90,205],"collect":[79],"received":[80],"signals":[81],"from":[82],"all":[83],"APs,":[84],"which":[85],"may":[86],"enable":[87],"CPU":[89],"infer":[91],"private":[93,125],"information":[94],"user":[96],"locations.":[97],"therefore":[99],"develop":[100],"analyze":[102],"privacy-preserving":[103],"schemes":[106],"under":[107],"framework":[109],"differential":[111],"privacy":[112,150,171,211],"(DP).":[113],"As":[114],"key":[116],"ingredient":[117],"estimator,":[121],"two":[122],"joint":[123],"differentially":[124],"noisy":[126],"completion":[128],"algorithms":[129],"respectively":[131],"Frank-Wolfe":[133],"iteration":[134],"singular":[136],"value":[137],"decomposition":[138],"are":[139,199,203],"presented.":[140],"provide":[142],"an":[143],"analysis":[144],"tradeoff":[147,209],"between":[148,210],"error.":[155],"In":[156],"particular,":[157],"we":[158],"show":[159],"that":[160],"error":[163,192],"mitigated":[166],"while":[167],"maintaining":[168],"same":[170],"level":[172],"by":[173],"increasing":[174],"payload":[176,197],"size":[177,198],"fixed":[179],"pilot":[180],"size;":[181],"scaling":[184],"laws":[185],"both":[187],"privacy-induced":[189],"privacy-independent":[191],"components":[193],"in":[194],"terms":[195],"characterized.":[200],"Simulation":[201],"results":[202],"provided":[204],"further":[206],"demonstrate":[207],"performance.":[215]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":4},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":3},{"year":2021,"cited_by_count":4}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
