{"id":"https://openalex.org/W3015044147","doi":"https://doi.org/10.1109/access.2020.2986137","title":"Downlink Extrapolation for FDD Multiple Antenna Systems Through Neural Network Using Extracted Uplink Path Gains","display_name":"Downlink Extrapolation for FDD Multiple Antenna Systems Through Neural Network Using Extracted Uplink Path Gains","publication_year":2020,"publication_date":"2020-01-01","ids":{"openalex":"https://openalex.org/W3015044147","doi":"https://doi.org/10.1109/access.2020.2986137","mag":"3015044147"},"language":"en","primary_location":{"id":"doi:10.1109/access.2020.2986137","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.2986137","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09057648.pdf","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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","datacite","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09057648.pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5006892394","display_name":"Hyuckjin Choi","orcid":"https://orcid.org/0000-0002-1134-2693"},"institutions":[{"id":"https://openalex.org/I157485424","display_name":"Korea Advanced Institute of Science and Technology","ror":"https://ror.org/05apxxy63","country_code":"KR","type":"education","lineage":["https://openalex.org/I157485424"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Hyuckjin Choi","raw_affiliation_strings":["School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea","institution_ids":["https://openalex.org/I157485424"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5065248740","display_name":"Junil Choi","orcid":"https://orcid.org/0000-0002-9862-9020"},"institutions":[{"id":"https://openalex.org/I157485424","display_name":"Korea Advanced Institute of Science and Technology","ror":"https://ror.org/05apxxy63","country_code":"KR","type":"education","lineage":["https://openalex.org/I157485424"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Junil Choi","raw_affiliation_strings":["School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea"],"raw_orcid":"https://orcid.org/0000-0002-9862-9020","affiliations":[{"raw_affiliation_string":"School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea","institution_ids":["https://openalex.org/I157485424"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I157485424"],"apc_list":{"value":1850,"currency":"USD","value_usd":1850},"apc_paid":{"value":1850,"currency":"USD","value_usd":1850},"fwci":0.0,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":{"value":0.02503352,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"8","issue":null,"first_page":"67100","last_page":"67111"},"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/T12791","display_name":"Full-Duplex Wireless Communications","score":0.9994000196456909,"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":0.9987000226974487,"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/telecommunications-link","display_name":"Telecommunications link","score":0.859855055809021},{"id":"https://openalex.org/keywords/base-station","display_name":"Base station","score":0.633002519607544},{"id":"https://openalex.org/keywords/extrapolation","display_name":"Extrapolation","score":0.6243463158607483},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6207749843597412},{"id":"https://openalex.org/keywords/channel-state-information","display_name":"Channel state information","score":0.6058505177497864},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.5641242861747742},{"id":"https://openalex.org/keywords/orthogonal-frequency-division-multiplexing","display_name":"Orthogonal frequency-division multiplexing","score":0.4870741665363312},{"id":"https://openalex.org/keywords/path","display_name":"Path (computing)","score":0.4576011002063751},{"id":"https://openalex.org/keywords/coherence-time","display_name":"Coherence time","score":0.4360131621360779},{"id":"https://openalex.org/keywords/control-theory","display_name":"Control theory (sociology)","score":0.4192975163459778},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.41207632422447205},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.4105660915374756},{"id":"https://openalex.org/keywords/real-time-computing","display_name":"Real-time computing","score":0.3271235525608063},{"id":"https://openalex.org/keywords/computer-network","display_name":"Computer network","score":0.31958866119384766},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2901671826839447},{"id":"https://openalex.org/keywords/coherence","display_name":"Coherence (philosophical gambling strategy)","score":0.24214735627174377},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.2305062711238861},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.22410368919372559},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.13225165009498596},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.12749189138412476},{"id":"https://openalex.org/keywords/wireless","display_name":"Wireless","score":0.12651512026786804}],"concepts":[{"id":"https://openalex.org/C138660444","wikidata":"https://www.wikidata.org/wiki/Q5607897","display_name":"Telecommunications link","level":2,"score":0.859855055809021},{"id":"https://openalex.org/C68649174","wikidata":"https://www.wikidata.org/wiki/Q1379116","display_name":"Base station","level":2,"score":0.633002519607544},{"id":"https://openalex.org/C132459708","wikidata":"https://www.wikidata.org/wiki/Q744069","display_name":"Extrapolation","level":2,"score":0.6243463158607483},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6207749843597412},{"id":"https://openalex.org/C148063708","wikidata":"https://www.wikidata.org/wiki/Q5072511","display_name":"Channel state information","level":3,"score":0.6058505177497864},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.5641242861747742},{"id":"https://openalex.org/C40409654","wikidata":"https://www.wikidata.org/wiki/Q375889","display_name":"Orthogonal frequency-division multiplexing","level":3,"score":0.4870741665363312},{"id":"https://openalex.org/C2777735758","wikidata":"https://www.wikidata.org/wiki/Q817765","display_name":"Path (computing)","level":2,"score":0.4576011002063751},{"id":"https://openalex.org/C47091857","wikidata":"https://www.wikidata.org/wiki/Q4118612","display_name":"Coherence time","level":3,"score":0.4360131621360779},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.4192975163459778},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.41207632422447205},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.4105660915374756},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3271235525608063},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.31958866119384766},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2901671826839447},{"id":"https://openalex.org/C2781181686","wikidata":"https://www.wikidata.org/wiki/Q4226068","display_name":"Coherence (philosophical gambling strategy)","level":2,"score":0.24214735627174377},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.2305062711238861},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.22410368919372559},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.13225165009498596},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.12749189138412476},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.12651512026786804},{"id":"https://openalex.org/C2775924081","wikidata":"https://www.wikidata.org/wiki/Q55608371","display_name":"Control (management)","level":2,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1109/access.2020.2986137","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.2986137","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09057648.pdf","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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},{"id":"mag:3015044147","is_oa":true,"landing_page_url":"https://arxiv.org/pdf/2004.01361","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"arXiv (Cornell University)","raw_type":null},{"id":"pmh:oai:doaj.org/article:a5fca20449cf4773afab91df23bba28f","is_oa":true,"landing_page_url":"https://doaj.org/article/a5fca20449cf4773afab91df23bba28f","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 8, Pp 67100-67111 (2020)","raw_type":"article"},{"id":"doi:10.48550/arxiv.2004.01361","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.2004.01361","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":null,"raw_source_name":null,"raw_type":"article-journal"}],"best_oa_location":{"id":"doi:10.1109/access.2020.2986137","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.2986137","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09057648.pdf","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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320320671","display_name":"National Research Foundation","ror":"https://ror.org/05s0g1g46"},{"id":"https://openalex.org/F4320328359","display_name":"Ministry of Science and ICT, South Korea","ror":"https://ror.org/01wpjm123"}],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3015044147.pdf","grobid_xml":"https://content.openalex.org/works/W3015044147.grobid-xml"},"referenced_works_count":40,"referenced_works":["https://openalex.org/W1938636034","https://openalex.org/W2001715686","https://openalex.org/W2015301486","https://openalex.org/W2059335839","https://openalex.org/W2074120933","https://openalex.org/W2076457767","https://openalex.org/W2094655360","https://openalex.org/W2106929598","https://openalex.org/W2113271807","https://openalex.org/W2134503975","https://openalex.org/W2141682101","https://openalex.org/W2171066806","https://openalex.org/W2272774410","https://openalex.org/W2488265751","https://openalex.org/W2606004785","https://openalex.org/W2610781055","https://openalex.org/W2808769300","https://openalex.org/W2884140695","https://openalex.org/W2886270111","https://openalex.org/W2908955555","https://openalex.org/W2916238263","https://openalex.org/W2916264957","https://openalex.org/W2936900179","https://openalex.org/W2943928690","https://openalex.org/W2947279656","https://openalex.org/W2962927793","https://openalex.org/W2963145597","https://openalex.org/W2963284693","https://openalex.org/W2963904701","https://openalex.org/W2967981090","https://openalex.org/W2968019094","https://openalex.org/W2970840827","https://openalex.org/W2981598692","https://openalex.org/W3010466875","https://openalex.org/W3013594094","https://openalex.org/W3013689226","https://openalex.org/W3102195069","https://openalex.org/W6737576513","https://openalex.org/W6758391372","https://openalex.org/W6785107828"],"related_works":["https://openalex.org/W3016131257","https://openalex.org/W2570443595","https://openalex.org/W2375328733","https://openalex.org/W2740109225","https://openalex.org/W2891030109","https://openalex.org/W2957767832","https://openalex.org/W2960246799","https://openalex.org/W2738377404","https://openalex.org/W2787417186","https://openalex.org/W2971883642","https://openalex.org/W2620619669","https://openalex.org/W3152550128","https://openalex.org/W2988542095","https://openalex.org/W2560135628","https://openalex.org/W2883799141","https://openalex.org/W3162660185","https://openalex.org/W2890485746","https://openalex.org/W2913316107","https://openalex.org/W2954009169","https://openalex.org/W3211456653"],"abstract_inverted_index":{"When":[0],"base":[1],"stations":[2,33],"(BSs)":[3],"are":[4],"deployed":[5],"with":[6,257],"multiple":[7],"antennas,":[8],"they":[9],"need":[10],"to":[11,19,41,60,71,88,131,261,289],"have":[12,121],"downlink":[13,21],"(DL)":[14],"channel":[15,67],"state":[16],"information":[17],"(CSI)":[18],"optimize":[20],"transmissions":[22],"by":[23],"beamforming.":[24],"The":[25,49,229],"DL":[26,36,50,92,101,109,134,160,185,194,216,241,266,287],"CSI":[27,93,135,139,186],"is":[28,107,206],"usually":[29],"measured":[30],"at":[31,140,174],"mobile":[32],"(MSs)":[34],"through":[35,208],"training":[37,51,165,181],"and":[38,52,100,159,183,200,215,225,240,243,265,286],"fed":[39],"back":[40],"the":[42,66,77,86,91,95,112,133,137,141,153,163,170,175,180,203,213,238,245,249,262,273,277,283,291,295],"BS":[43,87,176],"in":[44,104,227],"frequency":[45,255],"division":[46],"duplexing":[47],"(FDD).":[48],"uplink":[53],"(UL)":[54],"feedback":[55,78],"might":[56],"become":[57],"infeasible":[58],"due":[59,70],"insufficient":[61],"coherence":[62],"time":[63],"interval":[64],"when":[65],"rapidly":[68],"changes":[69],"high":[72],"speed":[73,296],"of":[74,98,144,150,172,202,294,297],"MSs.":[75,298],"Without":[76],"from":[79,136,237],"MSs,":[80],"it":[81],"may":[82],"be":[83,116,129],"possible":[84],"for":[85],"directly":[89],"obtain":[90],"using":[94,155,197,248],"inherent":[96],"relation":[97,114],"UL":[99,138,158,214,239,264,285],"channels":[102,217,242,288],"even":[103],"FDD,":[105],"which":[106,252,280],"called":[108],"extrapolation.":[110],"Although":[111],"exact":[113],"would":[115],"highly":[117],"nonlinear,":[118],"previous":[119,145],"studies":[120],"shown":[122,207],"that":[123,212,272],"a":[124,192],"neural":[125],"network":[126],"(NN)":[127],"can":[128],"used":[130],"estimate":[132],"BS.":[142],"Most":[143],"works":[146],"on":[147,254,282],"this":[148,189],"line":[149],"research":[151],"trained":[152],"NN":[154,164,246],"full":[156,263,284],"dimensional":[157],"channels;":[161],"however,":[162],"complexity":[166,182],"becomes":[167],"severe":[168],"as":[169],"number":[171],"antennas":[173],"increases.":[177],"To":[178],"reduce":[179],"improve":[184],"estimation":[187],"quality,":[188],"paper":[190],"proposes":[191],"novel":[193],"extrapolation":[195],"technique":[196,231,275],"simplified":[198],"input":[199],"output":[201],"NN.":[204],"It":[205],"many":[209],"measurement":[210],"campaigns":[211],"still":[218],"share":[219],"common":[220,235],"components":[221],"like":[222],"path":[223,250],"delays":[224],"angles":[226],"FDD.":[228],"proposed":[230,274],"first":[232],"extracts":[233],"these":[234],"coefficients":[236],"trains":[244],"only":[247],"gains,":[251],"depend":[253],"bands,":[256],"reduced":[258],"dimension":[259],"compared":[260],"channels.":[267],"Extensive":[268],"simulation":[269],"results":[270],"show":[271],"outperforms":[276],"conventional":[278],"approach,":[279],"relies":[281],"train":[290],"NN,":[292],"regardless":[293]},"counts_by_year":[],"updated_date":"2026-07-15T18:14:33.161393","created_date":"2025-10-10T00:00:00"}