{"id":"https://openalex.org/W2782968070","doi":"https://doi.org/10.1109/access.2018.2789860","title":"Vertex Graph-Coloring-Based Pilot Assignment With Location-Based Channel Estimation for Massive MIMO Systems","display_name":"Vertex Graph-Coloring-Based Pilot Assignment With Location-Based Channel Estimation for Massive MIMO Systems","publication_year":2018,"publication_date":"2018-01-01","ids":{"openalex":"https://openalex.org/W2782968070","doi":"https://doi.org/10.1109/access.2018.2789860","mag":"2782968070"},"language":"en","primary_location":{"id":"doi:10.1109/access.2018.2789860","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2018.2789860","pdf_url":null,"source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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 Access","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://doi.org/10.1109/access.2018.2789860","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5041179168","display_name":"Hieu Dao","orcid":"https://orcid.org/0000-0003-2940-807X"},"institutions":[{"id":"https://openalex.org/I40542001","display_name":"University of Ulsan","ror":"https://ror.org/02c2f8975","country_code":"KR","type":"education","lineage":["https://openalex.org/I40542001"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Hieu Trong Dao","raw_affiliation_strings":["Coding and Information Theory Lab, School of Electrical Engineering, University of Ulsan, Ulsan, South Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Coding and Information Theory Lab, School of Electrical Engineering, University of Ulsan, Ulsan, South Korea","institution_ids":["https://openalex.org/I40542001"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5100430160","display_name":"Sunghwan Kim","orcid":"https://orcid.org/0000-0003-1762-5915"},"institutions":[{"id":"https://openalex.org/I40542001","display_name":"University of Ulsan","ror":"https://ror.org/02c2f8975","country_code":"KR","type":"education","lineage":["https://openalex.org/I40542001"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Sunghwan Kim","raw_affiliation_strings":["Coding and Information Theory Lab, School of Electrical Engineering, University of Ulsan, Ulsan, South Korea"],"raw_orcid":"https://orcid.org/0000-0003-1762-5915","affiliations":[{"raw_affiliation_string":"Coding and Information Theory Lab, School of Electrical Engineering, University of Ulsan, Ulsan, South Korea","institution_ids":["https://openalex.org/I40542001"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":1850,"currency":"USD","value_usd":1850},"apc_paid":{"value":1850,"currency":"USD","value_usd":1850},"fwci":3.6663,"has_fulltext":false,"cited_by_count":36,"citation_normalized_percentile":{"value":0.93461767,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":90,"max":99},"biblio":{"volume":"6","issue":null,"first_page":"4599","last_page":"4607"},"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/T10936","display_name":"Millimeter-Wave Propagation and Modeling","score":0.9955999851226807,"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/T11409","display_name":"Advanced Wireless Network Optimization","score":0.9883000254631042,"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/mimo","display_name":"MIMO","score":0.8070049285888672},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.7083972096443176},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.502068281173706},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.4945625960826874},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.4602104723453522},{"id":"https://openalex.org/keywords/base-station","display_name":"Base station","score":0.41004300117492676},{"id":"https://openalex.org/keywords/real-time-computing","display_name":"Real-time computing","score":0.3756624162197113},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.29780369997024536},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.22601282596588135}],"concepts":[{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.8070049285888672},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7083972096443176},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.502068281173706},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.4945625960826874},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.4602104723453522},{"id":"https://openalex.org/C68649174","wikidata":"https://www.wikidata.org/wiki/Q1379116","display_name":"Base station","level":2,"score":0.41004300117492676},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3756624162197113},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.29780369997024536},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.22601282596588135}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1109/access.2018.2789860","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2018.2789860","pdf_url":null,"source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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 Access","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:bcbbd6b95cf24a82b7fb86e2e74c99e8","is_oa":true,"landing_page_url":"https://doaj.org/article/bcbbd6b95cf24a82b7fb86e2e74c99e8","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":"cc-by-sa","license_id":"https://openalex.org/licenses/cc-by-sa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"IEEE Access, Vol 6, Pp 4599-4607 (2018)","raw_type":"article"}],"best_oa_location":{"id":"doi:10.1109/access.2018.2789860","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2018.2789860","pdf_url":null,"source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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 Access","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G2052948235","display_name":null,"funder_award_id":"NRF-2016R1D1A1B03934653","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"}],"funders":[{"id":"https://openalex.org/F4320322120","display_name":"National Research Foundation of Korea","ror":"https://ror.org/013aysd81"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":23,"referenced_works":["https://openalex.org/W1636094761","https://openalex.org/W1971443733","https://openalex.org/W1986586714","https://openalex.org/W2001686537","https://openalex.org/W2013546591","https://openalex.org/W2035750833","https://openalex.org/W2036284383","https://openalex.org/W2085271812","https://openalex.org/W2121315337","https://openalex.org/W2128513990","https://openalex.org/W2129153304","https://openalex.org/W2136644341","https://openalex.org/W2142015064","https://openalex.org/W2145013959","https://openalex.org/W2147601077","https://openalex.org/W2407842861","https://openalex.org/W2553090309","https://openalex.org/W2558454036","https://openalex.org/W2561201433","https://openalex.org/W2589840645","https://openalex.org/W3098350033","https://openalex.org/W3106282754","https://openalex.org/W4249757966"],"related_works":["https://openalex.org/W2062470290","https://openalex.org/W2500106866","https://openalex.org/W2545343974","https://openalex.org/W4291895924","https://openalex.org/W1783583321","https://openalex.org/W2038397443","https://openalex.org/W2941374357","https://openalex.org/W2112785353","https://openalex.org/W2026727497","https://openalex.org/W2561058892"],"abstract_inverted_index":{"Massive":[0],"multiple-input":[1],"multiple-output":[2],"(MIMO)":[3],"is":[4,37,77,151],"considered":[5],"as":[6,153],"a":[7,21,69,119,154,174],"promising":[8],"technique":[9],"in":[10,79,103,131,168,216],"wireless":[11],"communication":[12],"systems,":[13,54],"which":[14],"contains":[15],"cellular":[16],"base":[17],"stations":[18],"equipped":[19],"with":[20,81,98,184,196,234],"very":[22],"large":[23],"number":[24],"of":[25,34,42,112,138,228],"antennas":[26],"to":[27,46,60,92,108,121,143,177,193],"serve":[28],"multiple":[29],"users.":[30],"However,":[31],"the":[32,40,82,94,99,104,110,113,123,132,160,169,179,185,205,211,217,225],"performance":[33],"massive":[35,52],"MIMO":[36,53],"limited":[38],"by":[39,189],"impact":[41],"pilot":[43,55,73,101,187,206],"contamination":[44],"due":[45],"inter-cell":[47],"interference":[48],"(ICI).":[49],"In":[50,66],"conventional":[51],"sequences":[56,188],"are":[57],"randomly":[58],"assigned":[59],"users":[61,97,130,167,183,195],"without":[62],"any":[63,128],"further":[64],"consideration.":[65],"this":[67],"paper,":[68],"vertex":[70],"graph":[71,158],"coloring-based":[72],"assignment":[74,207],"(VGC-PA)":[75],"algorithm":[76,176,232],"proposed":[78,230],"conjunction":[80],"existing":[83,212,235],"post-processing":[84,213],"discrete":[85],"Fourier":[86],"transform":[87],"(DFT)":[88],"filtering":[89,215],"channel":[90,105,218],"estimation":[91,106,219],"mitigate":[93,178],"ICI":[95,125,146,157,162,180,198],"between":[96,127,182],"same":[100,186],"sequence":[102],"process":[107],"improve":[109],"capacity":[111],"whole":[114],"system.":[115,170],"Specifically,":[116],"we":[117,172,209],"propose":[118,173],"metric":[120,199],"measure":[122],"potential":[124,161],"strength":[126,163],"two":[129],"system":[133],"based":[134,200],"on":[135,201],"their":[136],"angle":[137],"arrival,":[139],"correlation,":[140],"and":[141],"distances":[142],"construct":[144],"an":[145],"graph,":[147],"where":[148],"each":[149],"user":[150],"regarded":[152],"node.":[155],"This":[156],"denotes":[159],"relationship":[164,181],"among":[165],"all":[166],"Then,":[171],"VGC-PA":[175,231],"assigning":[190],"different":[191],"pilots":[192],"connected":[194],"high":[197],"some":[202],"criteria.":[203],"After":[204],"process,":[208],"apply":[210],"DFT":[214],"process.":[220],"The":[221],"simulation":[222],"results":[223],"show":[224],"significant":[226],"improvement":[227],"our":[229],"compared":[233],"methods.":[236]},"counts_by_year":[{"year":2025,"cited_by_count":4},{"year":2024,"cited_by_count":2},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":5},{"year":2020,"cited_by_count":6},{"year":2019,"cited_by_count":11},{"year":2018,"cited_by_count":6}],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2025-10-10T00:00:00"}