{"id":"https://openalex.org/W2112258689","doi":"https://doi.org/10.1109/jsac.1987.1146555","title":"256 QAM Modem for Multicarrier 400 Mbit/s Digital Radio","display_name":"256 QAM Modem for Multicarrier 400 Mbit/s Digital Radio","publication_year":1987,"publication_date":"1987-04-01","ids":{"openalex":"https://openalex.org/W2112258689","doi":"https://doi.org/10.1109/jsac.1987.1146555","mag":"2112258689"},"language":"en","primary_location":{"id":"doi:10.1109/jsac.1987.1146555","is_oa":false,"landing_page_url":"https://doi.org/10.1109/jsac.1987.1146555","pdf_url":null,"source":{"id":"https://openalex.org/S90422530","display_name":"IEEE Journal on Selected Areas in Communications","issn_l":"0733-8716","issn":["0733-8716","1558-0008"],"is_oa":false,"is_in_doaj":false,"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 Journal on Selected Areas in Communications","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/A5018740748","display_name":"Yasuhisa Nakamura","orcid":null},"institutions":[{"id":"https://openalex.org/I2251713219","display_name":"NTT (Japan)","ror":"https://ror.org/00berct97","country_code":"JP","type":"company","lineage":["https://openalex.org/I2251713219"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Y. Nakamura","raw_affiliation_strings":["NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan"],"affiliations":[{"raw_affiliation_string":"NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan","institution_ids":["https://openalex.org/I2251713219"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5013574445","display_name":"Yoichi Saito","orcid":null},"institutions":[{"id":"https://openalex.org/I2251713219","display_name":"NTT (Japan)","ror":"https://ror.org/00berct97","country_code":"JP","type":"company","lineage":["https://openalex.org/I2251713219"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Y. Saito","raw_affiliation_strings":["NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan"],"affiliations":[{"raw_affiliation_string":"NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan","institution_ids":["https://openalex.org/I2251713219"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5033389809","display_name":"Shinya Aikawa","orcid":"https://orcid.org/0000-0001-8226-8200"},"institutions":[{"id":"https://openalex.org/I2251713219","display_name":"NTT (Japan)","ror":"https://ror.org/00berct97","country_code":"JP","type":"company","lineage":["https://openalex.org/I2251713219"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"S. Aikawa","raw_affiliation_strings":["NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan"],"affiliations":[{"raw_affiliation_string":"NTT Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan","institution_ids":["https://openalex.org/I2251713219"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5018740748"],"corresponding_institution_ids":["https://openalex.org/I2251713219"],"apc_list":null,"apc_paid":null,"fwci":3.1397,"has_fulltext":false,"cited_by_count":29,"citation_normalized_percentile":{"value":0.91438184,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"5","issue":"3","first_page":"329","last_page":"335"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10187","display_name":"Radio Frequency Integrated Circuit Design","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"}},"topics":[{"id":"https://openalex.org/T10187","display_name":"Radio Frequency Integrated Circuit Design","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/T11248","display_name":"Advanced Power Amplifier Design","score":0.9993000030517578,"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/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9968000054359436,"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/baseband","display_name":"Baseband","score":0.7389734387397766},{"id":"https://openalex.org/keywords/qam","display_name":"QAM","score":0.7013185024261475},{"id":"https://openalex.org/keywords/quadrature-amplitude-modulation","display_name":"Quadrature amplitude modulation","score":0.6996210813522339},{"id":"https://openalex.org/keywords/megabit","display_name":"Megabit","score":0.6841607689857483},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6692204475402832},{"id":"https://openalex.org/keywords/digital-radio","display_name":"Digital radio","score":0.5866793990135193},{"id":"https://openalex.org/keywords/bit-error-rate","display_name":"Bit error rate","score":0.5478590726852417},{"id":"https://openalex.org/keywords/jitter","display_name":"Jitter","score":0.494007408618927},{"id":"https://openalex.org/keywords/line-code","display_name":"Line code","score":0.49364957213401794},{"id":"https://openalex.org/keywords/transmission","display_name":"Transmission (telecommunications)","score":0.4245273172855377},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.4170706868171692},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.3433120846748352},{"id":"https://openalex.org/keywords/bandwidth","display_name":"Bandwidth (computing)","score":0.24424871802330017},{"id":"https://openalex.org/keywords/decoding-methods","display_name":"Decoding methods","score":0.12911677360534668},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.12902501225471497}],"concepts":[{"id":"https://openalex.org/C65165936","wikidata":"https://www.wikidata.org/wiki/Q575784","display_name":"Baseband","level":3,"score":0.7389734387397766},{"id":"https://openalex.org/C59030546","wikidata":"https://www.wikidata.org/wiki/Q7265371","display_name":"QAM","level":5,"score":0.7013185024261475},{"id":"https://openalex.org/C32409245","wikidata":"https://www.wikidata.org/wiki/Q749753","display_name":"Quadrature amplitude modulation","level":4,"score":0.6996210813522339},{"id":"https://openalex.org/C185177783","wikidata":"https://www.wikidata.org/wiki/Q3332814","display_name":"Megabit","level":2,"score":0.6841607689857483},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6692204475402832},{"id":"https://openalex.org/C507880516","wikidata":"https://www.wikidata.org/wiki/Q1257510","display_name":"Digital radio","level":2,"score":0.5866793990135193},{"id":"https://openalex.org/C56296756","wikidata":"https://www.wikidata.org/wiki/Q840922","display_name":"Bit error rate","level":3,"score":0.5478590726852417},{"id":"https://openalex.org/C134652429","wikidata":"https://www.wikidata.org/wiki/Q1052698","display_name":"Jitter","level":2,"score":0.494007408618927},{"id":"https://openalex.org/C85961473","wikidata":"https://www.wikidata.org/wiki/Q1457387","display_name":"Line code","level":4,"score":0.49364957213401794},{"id":"https://openalex.org/C761482","wikidata":"https://www.wikidata.org/wiki/Q118093","display_name":"Transmission (telecommunications)","level":2,"score":0.4245273172855377},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.4170706868171692},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.3433120846748352},{"id":"https://openalex.org/C2776257435","wikidata":"https://www.wikidata.org/wiki/Q1576430","display_name":"Bandwidth (computing)","level":2,"score":0.24424871802330017},{"id":"https://openalex.org/C57273362","wikidata":"https://www.wikidata.org/wiki/Q576722","display_name":"Decoding methods","level":2,"score":0.12911677360534668},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.12902501225471497}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/jsac.1987.1146555","is_oa":false,"landing_page_url":"https://doi.org/10.1109/jsac.1987.1146555","pdf_url":null,"source":{"id":"https://openalex.org/S90422530","display_name":"IEEE Journal on Selected Areas in Communications","issn_l":"0733-8716","issn":["0733-8716","1558-0008"],"is_oa":false,"is_in_doaj":false,"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 Journal on Selected Areas in Communications","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/16","score":0.4099999964237213,"display_name":"Peace, Justice and strong institutions"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":11,"referenced_works":["https://openalex.org/W40978340","https://openalex.org/W65768686","https://openalex.org/W79385086","https://openalex.org/W1976937189","https://openalex.org/W2028884447","https://openalex.org/W2033222412","https://openalex.org/W2122630142","https://openalex.org/W2124379659","https://openalex.org/W3041682493","https://openalex.org/W6603213956","https://openalex.org/W6781063283"],"related_works":["https://openalex.org/W2808126919","https://openalex.org/W2360419830","https://openalex.org/W4294892273","https://openalex.org/W2135497628","https://openalex.org/W2040096401","https://openalex.org/W1986983329","https://openalex.org/W2358835670","https://openalex.org/W2138127602","https://openalex.org/W2548689985","https://openalex.org/W2162019127"],"abstract_inverted_index":{"This":[0],"paper":[1],"describes":[2],"the":[3,133,153],"performance":[4,57,142],"of":[5,19,92,96,107,135,143,155],"a":[6,40,46,64,72,115,121,144],"256":[7,36,145],"QAM":[8,37,146],"modem":[9,80,148],"with":[10],"400":[11,156],"Mbit":[12],"/":[13],"s":[14],"transmission":[15],"capacity.":[16],"A":[17],"variety":[18],"novel":[20],"techniques":[21,31],"are":[22,86,130],"introduced":[23],"as":[24],"ways":[25],"to":[26],"achieve":[27],"good":[28,54],"performance.":[29],"Key":[30],"include":[32],"1)":[33],"an":[34,78],"accurate":[35],"modulator":[38],"employing":[39],"new":[41],"monolithic":[42],"multiplier":[43],"IC,":[44],"2)":[45],"carrier":[47],"recovery":[48],"circuit":[49],"which":[50],"satisfies":[51],"such":[52],"requirements:":[53],"phase":[55],"jitter":[56],"and":[58,70,84,102,120],"no":[59],"false":[60],"lock":[61],"phenomenon,":[62],"3)":[63],"highly":[65],"stable":[66],"high-level":[67],"decision":[68],"circuit,":[69],"4)":[71],"forward":[73],"error":[74],"correcting":[75,118],"code.":[76],"As":[77],"overall":[79],"performance,":[81],"BER":[82,95,106],"characteristics":[83],"signatures":[85],"presented.":[87],"The":[88,126,141],"equivalent":[89],"CNR":[90],"degradations":[91],"1":[93],"dB(at":[94],"10":[97,108,136],"<sup":[98,109,137],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[99,110,138],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">-4</sup>":[100],")":[101],"2":[103],"dB":[104],"(at":[105],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">-9</sup>":[111],")are":[112],"obtained":[113],"using":[114],"single":[116],"Lee-error":[117],"code":[119],"seven-tap":[122],"baseband":[123],"transversal":[124],"equalizer.":[125],"residual":[127],"bit":[128],"errors":[129],"decreased":[131],"below":[132],"order":[134],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">-10</sup>":[139],".":[140],"multicarrier":[147],"has":[149],"given":[150],"prospect":[151],"for":[152],"development":[154],"Mbit/s":[157],"digital":[158],"microwave":[159],"radio":[160],"system.":[161]},"counts_by_year":[{"year":2024,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
