{"id":"https://openalex.org/W4402628330","doi":"https://doi.org/10.1109/apwcs61586.2024.10679280","title":"Graph Coloring-Based Pilot Assignment for User-Cluster-Centric Cell-Free Massive MIMO Systems","display_name":"Graph Coloring-Based Pilot Assignment for User-Cluster-Centric Cell-Free Massive MIMO Systems","publication_year":2024,"publication_date":"2024-08-21","ids":{"openalex":"https://openalex.org/W4402628330","doi":"https://doi.org/10.1109/apwcs61586.2024.10679280"},"language":"en","primary_location":{"id":"doi:10.1109/apwcs61586.2024.10679280","is_oa":false,"landing_page_url":"https://doi.org/10.1109/apwcs61586.2024.10679280","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2024 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS)","raw_type":"proceedings-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/A5030871391","display_name":"Sijie Xia","orcid":"https://orcid.org/0009-0004-6484-041X"},"institutions":[{"id":"https://openalex.org/I201537933","display_name":"Tohoku University","ror":"https://ror.org/01dq60k83","country_code":"JP","type":"education","lineage":["https://openalex.org/I201537933"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Sijie Xia","raw_affiliation_strings":["Graduate School of Engineering, Tohoku University,Department of Communications Engineering,Sendai,Miyagi,Japan,980-8579"],"affiliations":[{"raw_affiliation_string":"Graduate School of Engineering, Tohoku University,Department of Communications Engineering,Sendai,Miyagi,Japan,980-8579","institution_ids":["https://openalex.org/I201537933"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100435655","display_name":"Qiang Chen","orcid":"https://orcid.org/0000-0001-8714-6819"},"institutions":[{"id":"https://openalex.org/I201537933","display_name":"Tohoku University","ror":"https://ror.org/01dq60k83","country_code":"JP","type":"education","lineage":["https://openalex.org/I201537933"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Qiang Chen","raw_affiliation_strings":["Graduate School of Engineering, Tohoku University,Department of Communications Engineering,Sendai,Miyagi,Japan,980-8579"],"affiliations":[{"raw_affiliation_string":"Graduate School of Engineering, Tohoku University,Department of Communications Engineering,Sendai,Miyagi,Japan,980-8579","institution_ids":["https://openalex.org/I201537933"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5011281064","display_name":"Fumiyuki Adachi","orcid":"https://orcid.org/0000-0002-5416-0718"},"institutions":[{"id":"https://openalex.org/I201537933","display_name":"Tohoku University","ror":"https://ror.org/01dq60k83","country_code":"JP","type":"education","lineage":["https://openalex.org/I201537933"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Fumiyuki Adachi","raw_affiliation_strings":["International Research Institute of Disaster Science, Tohoku University,Sendai,Miyagi,Japan,980-8572"],"affiliations":[{"raw_affiliation_string":"International Research Institute of Disaster Science, Tohoku University,Sendai,Miyagi,Japan,980-8572","institution_ids":["https://openalex.org/I201537933"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5030871391"],"corresponding_institution_ids":["https://openalex.org/I201537933"],"apc_list":null,"apc_paid":null,"fwci":0.4614,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.63374463,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":95,"max":96},"biblio":{"volume":null,"issue":null,"first_page":"1","last_page":"4"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10148","display_name":"Advanced MIMO Systems Optimization","score":0.9988999962806702,"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":0.9988999962806702,"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":0.9911999702453613,"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/T11499","display_name":"ICT Impact and Policies","score":0.9853000044822693,"subfield":{"id":"https://openalex.org/subfields/2214","display_name":"Media Technology"},"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":0.7269407510757446},{"id":"https://openalex.org/keywords/graph-coloring","display_name":"Graph coloring","score":0.6596895456314087},{"id":"https://openalex.org/keywords/mimo","display_name":"MIMO","score":0.5642586350440979},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.5107369422912598},{"id":"https://openalex.org/keywords/cluster","display_name":"Cluster (spacecraft)","score":0.43872204422950745},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.346319317817688},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.22030213475227356}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7269407510757446},{"id":"https://openalex.org/C76946457","wikidata":"https://www.wikidata.org/wiki/Q504843","display_name":"Graph coloring","level":3,"score":0.6596895456314087},{"id":"https://openalex.org/C207987634","wikidata":"https://www.wikidata.org/wiki/Q176862","display_name":"MIMO","level":3,"score":0.5642586350440979},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.5107369422912598},{"id":"https://openalex.org/C164866538","wikidata":"https://www.wikidata.org/wiki/Q367351","display_name":"Cluster (spacecraft)","level":2,"score":0.43872204422950745},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.346319317817688},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.22030213475227356},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/apwcs61586.2024.10679280","is_oa":false,"landing_page_url":"https://doi.org/10.1109/apwcs61586.2024.10679280","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2024 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G8689317489","display_name":null,"funder_award_id":"02201","funder_id":"https://openalex.org/F4320335839","funder_display_name":"National Institute of Information and Communications Technology"}],"funders":[{"id":"https://openalex.org/F4320335839","display_name":"National Institute of Information and Communications Technology","ror":"https://ror.org/016bgq349"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":9,"referenced_works":["https://openalex.org/W2108301529","https://openalex.org/W2496528305","https://openalex.org/W2782968070","https://openalex.org/W2964042011","https://openalex.org/W2964181991","https://openalex.org/W2965123227","https://openalex.org/W2969768389","https://openalex.org/W3035475152","https://openalex.org/W4393864511"],"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],"user-cluster-centric":[1],"(UCC)-based":[2],"cell-free":[3],"massive":[4],"multiple-input":[5],"multiple-output":[6],"(CF-mMIMO)":[7],"system,":[8],"which":[9],"realizes":[10],"multi-user":[11,40],"multiplexing":[12],"in":[13],"each":[14],"user-cluster":[15],"formed":[16],"by":[17,22,66],"neighboring":[18],"users":[19],"and":[20,28],"served":[21],"surrounding":[23],"antennas,":[24],"guarantees":[25],"system":[26],"scalability":[27],"improves":[29],"the":[30,57],"user":[31],"capacity.":[32],"However,":[33],"accurate":[34],"channel":[35],"estimation":[36],"is":[37,64],"necessary":[38],"for":[39],"multiplexing.":[41],"In":[42],"this":[43],"paper,":[44],"we":[45],"propose":[46],"a":[47],"graph":[48],"coloring":[49],"(GC)-based":[50],"pilot":[51,72,77],"assignment":[52,73],"method":[53],"to":[54],"efficiently":[55],"reuse":[56],"limited":[58],"number":[59],"of":[60],"orthogonal":[61],"pilots.":[62],"It":[63],"verified":[65],"simulation":[67],"that":[68],"our":[69],"proposed":[70],"GC-based":[71],"can":[74],"effectively":[75],"avoid":[76],"contamination.":[78]},"counts_by_year":[{"year":2025,"cited_by_count":2}],"updated_date":"2025-12-27T23:08:20.325037","created_date":"2025-10-10T00:00:00"}
