{"id":"https://openalex.org/W4289536033","doi":"https://doi.org/10.1109/lcomm.2022.3195908","title":"Downlink Resource Allocation With Pilot Length Optimization for User-Centric Cell-Free MIMO Networks","display_name":"Downlink Resource Allocation With Pilot Length Optimization for User-Centric Cell-Free MIMO Networks","publication_year":2022,"publication_date":"2022-08-02","ids":{"openalex":"https://openalex.org/W4289536033","doi":"https://doi.org/10.1109/lcomm.2022.3195908"},"language":"en","primary_location":{"id":"doi:10.1109/lcomm.2022.3195908","is_oa":false,"landing_page_url":"https://doi.org/10.1109/lcomm.2022.3195908","pdf_url":null,"source":{"id":"https://openalex.org/S147316732","display_name":"IEEE Communications Letters","issn_l":"1089-7798","issn":["1089-7798","1558-2558","2373-7891"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310316002","host_organization_name":"IEEE Communications Society","host_organization_lineage":["https://openalex.org/P4310316002","https://openalex.org/P4310319808"],"host_organization_lineage_names":["IEEE Communications Society","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 Communications Letters","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/A5086544282","display_name":"Yang Ming","orcid":"https://orcid.org/0000-0002-6870-312X"},"institutions":[{"id":"https://openalex.org/I3131625388","display_name":"University Town of Shenzhen","ror":"https://ror.org/05f5j6225","country_code":"CN","type":"education","lineage":["https://openalex.org/I3131625388"]},{"id":"https://openalex.org/I99065089","display_name":"Tsinghua University","ror":"https://ror.org/03cve4549","country_code":"CN","type":"education","lineage":["https://openalex.org/I99065089"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yang Ming","raw_affiliation_strings":["Shenzhen International Graduate School, Tsinghua University, Shenzhen, China"],"raw_orcid":"https://orcid.org/0000-0002-6870-312X","affiliations":[{"raw_affiliation_string":"Shenzhen International Graduate School, Tsinghua University, Shenzhen, China","institution_ids":["https://openalex.org/I3131625388","https://openalex.org/I99065089"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5086536570","display_name":"Ziyuan Sha","orcid":"https://orcid.org/0000-0002-9992-4099"},"institutions":[{"id":"https://openalex.org/I99065089","display_name":"Tsinghua University","ror":"https://ror.org/03cve4549","country_code":"CN","type":"education","lineage":["https://openalex.org/I99065089"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Ziyuan Sha","raw_affiliation_strings":["Department of Electronic Engineering, Tsinghua University, Beijing, China"],"raw_orcid":"https://orcid.org/0000-0002-9992-4099","affiliations":[{"raw_affiliation_string":"Department of Electronic Engineering, Tsinghua University, Beijing, China","institution_ids":["https://openalex.org/I99065089"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5108047157","display_name":"Yuhan Dong","orcid":"https://orcid.org/0000-0001-5275-1787"},"institutions":[{"id":"https://openalex.org/I3131625388","display_name":"University Town of Shenzhen","ror":"https://ror.org/05f5j6225","country_code":"CN","type":"education","lineage":["https://openalex.org/I3131625388"]},{"id":"https://openalex.org/I99065089","display_name":"Tsinghua University","ror":"https://ror.org/03cve4549","country_code":"CN","type":"education","lineage":["https://openalex.org/I99065089"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yuhan Dong","raw_affiliation_strings":["Shenzhen International Graduate School, Tsinghua University, Shenzhen, China"],"raw_orcid":"https://orcid.org/0000-0001-5275-1787","affiliations":[{"raw_affiliation_string":"Shenzhen International Graduate School, Tsinghua University, Shenzhen, China","institution_ids":["https://openalex.org/I3131625388","https://openalex.org/I99065089"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5102023049","display_name":"Zhaocheng Wang","orcid":"https://orcid.org/0000-0002-6150-3846"},"institutions":[{"id":"https://openalex.org/I3131625388","display_name":"University Town of Shenzhen","ror":"https://ror.org/05f5j6225","country_code":"CN","type":"education","lineage":["https://openalex.org/I3131625388"]},{"id":"https://openalex.org/I99065089","display_name":"Tsinghua University","ror":"https://ror.org/03cve4549","country_code":"CN","type":"education","lineage":["https://openalex.org/I99065089"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Zhaocheng Wang","raw_affiliation_strings":["Shenzhen International Graduate School, Tsinghua University, Shenzhen, China"],"raw_orcid":"https://orcid.org/0000-0002-6150-3846","affiliations":[{"raw_affiliation_string":"Shenzhen International Graduate School, Tsinghua University, Shenzhen, China","institution_ids":["https://openalex.org/I3131625388","https://openalex.org/I99065089"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.7951,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.69763454,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":97},"biblio":{"volume":"26","issue":"11","first_page":"2705","last_page":"2709"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":1.0,"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":1.0,"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/T11458","display_name":"Advanced Wireless Communication Technologies","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"}},{"id":"https://openalex.org/T10500","display_name":"Sparse and Compressive Sensing Techniques","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"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/mimo","display_name":"MIMO","score":0.7384552955627441},{"id":"https://openalex.org/keywords/telecommunications-link","display_name":"Telecommunications link","score":0.7236528396606445},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6488214731216431},{"id":"https://openalex.org/keywords/scheduling","display_name":"Scheduling (production processes)","score":0.5976042151451111},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.5653256773948669},{"id":"https://openalex.org/keywords/convex-optimization","display_name":"Convex optimization","score":0.5396751165390015},{"id":"https://openalex.org/keywords/proportionally-fair","display_name":"Proportionally fair","score":0.48579955101013184},{"id":"https://openalex.org/keywords/multi-user","display_name":"Multi-user","score":0.4796448349952698},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.47577205300331116},{"id":"https://openalex.org/keywords/optimization-problem","display_name":"Optimization problem","score":0.4738854765892029},{"id":"https://openalex.org/keywords/transmitter-power-output","display_name":"Transmitter power output","score":0.4398577809333801},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.4212809205055237},{"id":"https://openalex.org/keywords/resource-allocation","display_name":"Resource allocation","score":0.41858503222465515},{"id":"https://openalex.org/keywords/multi-user-mimo","display_name":"Multi-user MIMO","score":0.4128110110759735},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.3403659164905548},{"id":"https://openalex.org/keywords/regular-polygon","display_name":"Regular polygon","score":0.31308966875076294},{"id":"https://openalex.org/keywords/transmitter","display_name":"Transmitter","score":0.31103190779685974},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.23954421281814575},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.23368895053863525},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.2323528528213501},{"id":"https://openalex.org/keywords/dynamic-priority-scheduling","display_name":"Dynamic priority scheduling","score":0.12939339876174927},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.12747684121131897},{"id":"https://openalex.org/keywords/round-robin-scheduling","display_name":"Round-robin scheduling","score":0.1173851490020752}],"concepts":[{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.7384552955627441},{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.7236528396606445},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6488214731216431},{"id":"https://openalex.org/C206729178","wikidata":"https://www.wikidata.org/wiki/Q2271896","display_name":"Scheduling (production processes)","level":2,"score":0.5976042151451111},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.5653256773948669},{"id":"https://openalex.org/C157972887","wikidata":"https://www.wikidata.org/wiki/Q463359","display_name":"Convex optimization","level":3,"score":0.5396751165390015},{"id":"https://openalex.org/C86127852","wikidata":"https://www.wikidata.org/wiki/Q7250364","display_name":"Proportionally fair","level":5,"score":0.48579955101013184},{"id":"https://openalex.org/C2778002699","wikidata":"https://www.wikidata.org/wiki/Q876057","display_name":"Multi-user","level":2,"score":0.4796448349952698},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.47577205300331116},{"id":"https://openalex.org/C137836250","wikidata":"https://www.wikidata.org/wiki/Q984063","display_name":"Optimization problem","level":2,"score":0.4738854765892029},{"id":"https://openalex.org/C65422117","wikidata":"https://www.wikidata.org/wiki/Q358527","display_name":"Transmitter power output","level":4,"score":0.4398577809333801},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.4212809205055237},{"id":"https://openalex.org/C29202148","wikidata":"https://www.wikidata.org/wiki/Q287260","display_name":"Resource allocation","level":2,"score":0.41858503222465515},{"id":"https://openalex.org/C91330434","wikidata":"https://www.wikidata.org/wiki/Q738298","display_name":"Multi-user MIMO","level":4,"score":0.4128110110759735},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.3403659164905548},{"id":"https://openalex.org/C112680207","wikidata":"https://www.wikidata.org/wiki/Q714886","display_name":"Regular polygon","level":2,"score":0.31308966875076294},{"id":"https://openalex.org/C47798520","wikidata":"https://www.wikidata.org/wiki/Q190157","display_name":"Transmitter","level":3,"score":0.31103190779685974},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.23954421281814575},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.23368895053863525},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.2323528528213501},{"id":"https://openalex.org/C107568181","wikidata":"https://www.wikidata.org/wiki/Q5319000","display_name":"Dynamic priority scheduling","level":3,"score":0.12939339876174927},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.12747684121131897},{"id":"https://openalex.org/C175893541","wikidata":"https://www.wikidata.org/wiki/Q1196582","display_name":"Round-robin scheduling","level":4,"score":0.1173851490020752},{"id":"https://openalex.org/C5119721","wikidata":"https://www.wikidata.org/wiki/Q220501","display_name":"Quality of service","level":2,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/lcomm.2022.3195908","is_oa":false,"landing_page_url":"https://doi.org/10.1109/lcomm.2022.3195908","pdf_url":null,"source":{"id":"https://openalex.org/S147316732","display_name":"IEEE Communications Letters","issn_l":"1089-7798","issn":["1089-7798","1558-2558","2373-7891"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310316002","host_organization_name":"IEEE Communications Society","host_organization_lineage":["https://openalex.org/P4310316002","https://openalex.org/P4310319808"],"host_organization_lineage_names":["IEEE Communications Society","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 Communications Letters","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G5495080709","display_name":null,"funder_award_id":"2018YFB1801102","funder_id":"https://openalex.org/F4320335777","funder_display_name":"National Key Research and Development Program of China"}],"funders":[{"id":"https://openalex.org/F4320335777","display_name":"National Key Research and Development Program of China","ror":null}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":17,"referenced_works":["https://openalex.org/W1994534328","https://openalex.org/W2107861471","https://openalex.org/W2286275639","https://openalex.org/W2742503793","https://openalex.org/W2963280061","https://openalex.org/W2974046131","https://openalex.org/W2984884920","https://openalex.org/W3041415426","https://openalex.org/W3082876858","https://openalex.org/W3128549410","https://openalex.org/W3158832185","https://openalex.org/W3168711504","https://openalex.org/W3192674192","https://openalex.org/W3195410378","https://openalex.org/W3207107933","https://openalex.org/W4206180546","https://openalex.org/W4211052828"],"related_works":["https://openalex.org/W2728807107","https://openalex.org/W2962837930","https://openalex.org/W2059045613","https://openalex.org/W2022380002","https://openalex.org/W2519009872","https://openalex.org/W2139372543","https://openalex.org/W2110984460","https://openalex.org/W2106747410","https://openalex.org/W2552025594","https://openalex.org/W2099388115"],"abstract_inverted_index":{"Pilot":[0],"length":[1,32],"is":[2,44,59,123,142],"a":[3,94,143],"crucial":[4],"parameter":[5],"in":[6,89,111],"cell-free":[7,36],"multiple-input":[8],"multiple-output":[9],"(MIMO)":[10],"networks,":[11],"which":[12,141],"could":[13],"significantly":[14],"affect":[15],"the":[16,25,41,51,84,90,101,128,134],"downlink":[17,91],"throughput.":[18],"In":[19],"this":[20],"letter,":[21],"we":[22,80],"jointly":[23],"optimize":[24],"user":[26,78,87,147],"scheduling,":[27],"power":[28,152],"allocation":[29],"and":[30,151],"pilot":[31,63,74],"for":[33],"user-centric":[34],"(UC)":[35],"MIMO":[37],"networks.":[38],"We":[39],"consider":[40],"frequency":[42],"band":[43],"uniformly":[45],"split":[46],"into":[47],"several":[48],"sub-channels.":[49],"As":[50],"number":[52],"of":[53],"users":[54,68],"scheduled":[55],"on":[56,69],"one":[57],"sub-channel":[58,71,149],"commonly":[60],"small,":[61],"orthogonal":[62],"sequences":[64],"are":[65],"adopted":[66],"among":[67],"each":[70],"to":[72,82,126],"avoid":[73],"contamination.":[75],"To":[76],"achieve":[77],"fairness,":[79],"aim":[81],"maximize":[83],"minimum":[85],"ergodic":[86],"rate":[88],"transmission,":[92],"yielding":[93],"challenging":[95],"mix-integer":[96],"non-convex":[97],"optimization.":[98,153],"Inspired":[99],"by":[100],"weighted":[102],"<inline-formula":[103],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[104],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">":[105],"<tex-math":[106],"notation=\"LaTeX\">$l_{1}$":[107],"</tex-math></inline-formula>":[108],"-norm":[109],"approximation":[110,118],"compressive":[112],"sensing":[113],"together":[114],"with":[115],"successive":[116],"convex":[117],"(SCA),":[119],"an":[120],"iterative":[121],"scheme":[122,136],"then":[124],"proposed":[125,135],"solve":[127],"problem.":[129],"Simulation":[130],"results":[131],"demonstrate":[132],"that":[133],"outperforms":[137],"its":[138],"state-of-the-art":[139],"counterpart,":[140],"three-step":[144],"algorithm":[145],"including":[146],"grouping,":[148],"allocation,":[150]},"counts_by_year":[{"year":2025,"cited_by_count":3},{"year":2024,"cited_by_count":2},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":1}],"updated_date":"2026-03-27T05:58:40.876381","created_date":"2025-10-10T00:00:00"}