{"id":"https://openalex.org/W3179114306","doi":"https://doi.org/10.1155/2021/9913149","title":"Pilot Assignment Based on Graph Coloring and Location Information in Multicell Multiuser Massive MIMO Systems","display_name":"Pilot Assignment Based on Graph Coloring and Location Information in Multicell Multiuser Massive MIMO Systems","publication_year":2021,"publication_date":"2021-01-01","ids":{"openalex":"https://openalex.org/W3179114306","doi":"https://doi.org/10.1155/2021/9913149","mag":"3179114306"},"language":"en","primary_location":{"id":"doi:10.1155/2021/9913149","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2021/9913149","pdf_url":"https://downloads.hindawi.com/journals/wcmc/2021/9913149.pdf","source":{"id":"https://openalex.org/S235346","display_name":"Wireless Communications and Mobile Computing","issn_l":"1530-8669","issn":["1530-8669","1530-8677"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Wireless Communications and Mobile Computing","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"hybrid","oa_url":"https://downloads.hindawi.com/journals/wcmc/2021/9913149.pdf","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5046187793","display_name":"Canyun Xiong","orcid":"https://orcid.org/0000-0002-4745-1365"},"institutions":[{"id":"https://openalex.org/I158842170","display_name":"Chongqing University","ror":"https://ror.org/023rhb549","country_code":"CN","type":"education","lineage":["https://openalex.org/I158842170"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Canyun Xiong","raw_affiliation_strings":["School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","School of Microelectronics and Communication Engineering, Chongqing University, Chongqing"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","institution_ids":["https://openalex.org/I158842170"]},{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing","institution_ids":["https://openalex.org/I158842170"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5076498651","display_name":"Shiyong Chen","orcid":"https://orcid.org/0000-0003-1395-4340"},"institutions":[{"id":"https://openalex.org/I158842170","display_name":"Chongqing University","ror":"https://ror.org/023rhb549","country_code":"CN","type":"education","lineage":["https://openalex.org/I158842170"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Shiyong Chen","raw_affiliation_strings":["School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","School of Microelectronics and Communication Engineering, Chongqing University, Chongqing"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","institution_ids":["https://openalex.org/I158842170"]},{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing","institution_ids":["https://openalex.org/I158842170"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100623216","display_name":"Liang Li","orcid":"https://orcid.org/0000-0003-3864-1711"},"institutions":[{"id":"https://openalex.org/I158842170","display_name":"Chongqing University","ror":"https://ror.org/023rhb549","country_code":"CN","type":"education","lineage":["https://openalex.org/I158842170"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Liang Li","raw_affiliation_strings":["School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","School of Microelectronics and Communication Engineering, Chongqing University, Chongqing"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","institution_ids":["https://openalex.org/I158842170"]},{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing","institution_ids":["https://openalex.org/I158842170"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5089934059","display_name":"Yucheng Wu","orcid":"https://orcid.org/0000-0003-1116-7706"},"institutions":[{"id":"https://openalex.org/I158842170","display_name":"Chongqing University","ror":"https://ror.org/023rhb549","country_code":"CN","type":"education","lineage":["https://openalex.org/I158842170"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Yucheng Wu","raw_affiliation_strings":["School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","School of Microelectronics and Communication Engineering, Chongqing University, Chongqing"],"raw_orcid":"https://orcid.org/0000-0003-1116-7706","affiliations":[{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China","institution_ids":["https://openalex.org/I158842170"]},{"raw_affiliation_string":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing","institution_ids":["https://openalex.org/I158842170"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5089934059"],"corresponding_institution_ids":["https://openalex.org/I158842170"],"apc_list":{"value":2300,"currency":"USD","value_usd":2300},"apc_paid":{"value":2300,"currency":"USD","value_usd":2300},"fwci":0.1017,"has_fulltext":true,"cited_by_count":4,"citation_normalized_percentile":{"value":0.4256007,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":97},"biblio":{"volume":"2021","issue":"1","first_page":null,"last_page":null},"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/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/T11458","display_name":"Advanced Wireless Communication Technologies","score":0.9987999796867371,"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":0.8877454400062561},{"id":"https://openalex.org/keywords/graph-coloring","display_name":"Graph coloring","score":0.698799729347229},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.6216259002685547},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.4520135819911957},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.4519491195678711},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.3139938712120056},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.06149214506149292}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8877454400062561},{"id":"https://openalex.org/C76946457","wikidata":"https://www.wikidata.org/wiki/Q504843","display_name":"Graph coloring","level":3,"score":0.698799729347229},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.6216259002685547},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.4520135819911957},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.4519491195678711},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.3139938712120056},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.06149214506149292}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1155/2021/9913149","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2021/9913149","pdf_url":"https://downloads.hindawi.com/journals/wcmc/2021/9913149.pdf","source":{"id":"https://openalex.org/S235346","display_name":"Wireless Communications and Mobile Computing","issn_l":"1530-8669","issn":["1530-8669","1530-8677"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Wireless Communications and Mobile Computing","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:4e7b749c4f06427d81a6cd4f0835c72d","is_oa":false,"landing_page_url":"https://doaj.org/article/4e7b749c4f06427d81a6cd4f0835c72d","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Wireless Communications and Mobile Computing, Vol 2021 (2021)","raw_type":"article"}],"best_oa_location":{"id":"doi:10.1155/2021/9913149","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2021/9913149","pdf_url":"https://downloads.hindawi.com/journals/wcmc/2021/9913149.pdf","source":{"id":"https://openalex.org/S235346","display_name":"Wireless Communications and Mobile Computing","issn_l":"1530-8669","issn":["1530-8669","1530-8677"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Wireless Communications and Mobile Computing","raw_type":"journal-article"},"sustainable_development_goals":[{"display_name":"Affordable and clean energy","score":0.4099999964237213,"id":"https://metadata.un.org/sdg/7"}],"awards":[{"id":"https://openalex.org/G5428187623","display_name":null,"funder_award_id":"2018YFB2100100","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":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3179114306.pdf","grobid_xml":"https://content.openalex.org/works/W3179114306.grobid-xml"},"referenced_works_count":32,"referenced_works":["https://openalex.org/W1636094761","https://openalex.org/W2145013959","https://openalex.org/W2408034629","https://openalex.org/W2765853827","https://openalex.org/W2781054684","https://openalex.org/W2782968070","https://openalex.org/W2784069082","https://openalex.org/W2784477914","https://openalex.org/W2794365014","https://openalex.org/W2794681628","https://openalex.org/W2799249207","https://openalex.org/W2800486579","https://openalex.org/W2800897465","https://openalex.org/W2800900312","https://openalex.org/W2803073251","https://openalex.org/W2888987802","https://openalex.org/W2889454423","https://openalex.org/W2912978723","https://openalex.org/W2913551535","https://openalex.org/W2921187277","https://openalex.org/W2921474503","https://openalex.org/W2963151934","https://openalex.org/W2963666254","https://openalex.org/W2968746919","https://openalex.org/W2973078122","https://openalex.org/W2997786076","https://openalex.org/W3013248313","https://openalex.org/W3016433488","https://openalex.org/W3034448035","https://openalex.org/W3083228202","https://openalex.org/W3100164193","https://openalex.org/W3102454833"],"related_works":["https://openalex.org/W2545343974","https://openalex.org/W4291895924","https://openalex.org/W1783583321","https://openalex.org/W2038397443","https://openalex.org/W2941374357","https://openalex.org/W2026727497","https://openalex.org/W4388520214","https://openalex.org/W2164866798","https://openalex.org/W1976502299","https://openalex.org/W2088459095"],"abstract_inverted_index":{"A":[0],"massive":[1],"multiple\u2010input":[2],"multiple\u2010output":[3],"(MIMO)":[4],"system":[5],"uses":[6],"a":[7,51],"large":[8],"number":[9],"of":[10,26,46,66,83,171],"antennas":[11],"in":[12,30],"the":[13,24,27,36,44,64,73,81,97,105,116,124,127,134,141,163,177],"base":[14],"station":[15],"(BS)":[16],"to":[17,43,62,89,113,123,132,148],"serve":[18],"multiple":[19],"users,":[20],"which":[21],"significantly":[22,198],"improves":[23],"capacity":[25],"system.":[28],"However,":[29],"time":[31],"division":[32],"duplex":[33],"(TDD)":[34],"mode,":[35],"pilot":[37,52,143,179],"contamination":[38],"(PC)":[39],"is":[40,130,166],"inevitable":[41],"due":[42],"multiplexing":[45],"pilots.":[47],"This":[48],"paper":[49],"proposed":[50,74,131],"assignment":[53,180],"based":[54,69,155,182],"on":[55,70,156,183],"graph":[56,71,184],"coloring":[57],"and":[58,87,103,191],"location":[59,78],"information":[60,79],"(GC\u2010LI)":[61],"improve":[63],"performance":[65],"users.":[67],"Specifically,":[68],"coloring,":[72,185],"GC\u2010LI":[75,128,164],"algorithm":[76,129,165],"combines":[77],"like":[80],"angle":[82],"arrival":[84],"(AoA),":[85],"distance,":[86],"correlation":[88],"construct":[90],"an":[91],"interference":[92,98,125,136],"graph.":[93],"Then,":[94],"we":[95],"calculate":[96],"between":[99,138],"any":[100],"two":[101],"users":[102,117,139,150],"use":[104],"postprocessing":[106],"discrete":[107],"Fourier":[108],"transform":[109],"(DFT)":[110],"filtering":[111],"process":[112],"effectively":[114],"distinguish":[115],"with":[118,140,151,176],"nonoverlapping":[119],"AoAs.":[120],"Finally,":[121],"according":[122],"graph,":[126],"mitigate":[133],"intercell":[135],"(ICI)":[137],"same":[142],"by":[144],"assigning":[145],"different":[146],"pilots":[147],"connected":[149],"high":[152],"ICI":[153],"metrics":[154],"some":[157],"regulation.":[158],"Simulation":[159],"results":[160],"show":[161],"that":[162],"suitable":[167],"for":[168],"various":[169],"types":[170],"cells.":[172],"In":[173],"addition,":[174],"compared":[175],"existing":[178],"algorithms":[181],"users\u2019":[186],"average":[187],"signal\u2010to\u2010interference\u2010plus\u2010noise":[188],"ratio":[189],"(SINR)":[190],"uplink":[192],"achievable":[193],"sum":[194],"rate":[195],"(ASR)":[196],"are":[197],"improved.":[199]},"counts_by_year":[{"year":2025,"cited_by_count":3},{"year":2023,"cited_by_count":1}],"updated_date":"2026-05-21T06:26:12.895304","created_date":"2025-10-10T00:00:00"}
