{"id":"https://openalex.org/W2141364340","doi":"https://doi.org/10.1109/wcnc.2009.4917850","title":"On the Construction of Orthogonal Spreading Code Groups for MC-CDMA with FDE in a Frequency Selective Channel","display_name":"On the Construction of Orthogonal Spreading Code Groups for MC-CDMA with FDE in a Frequency Selective Channel","publication_year":2009,"publication_date":"2009-04-01","ids":{"openalex":"https://openalex.org/W2141364340","doi":"https://doi.org/10.1109/wcnc.2009.4917850","mag":"2141364340"},"language":"en","primary_location":{"id":"doi:10.1109/wcnc.2009.4917850","is_oa":false,"landing_page_url":"https://doi.org/10.1109/wcnc.2009.4917850","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2009 IEEE Wireless Communications and Networking Conference","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/A5032592463","display_name":"Koichi Adachi","orcid":"https://orcid.org/0000-0003-3463-1233"},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Koichi Adachi","raw_affiliation_strings":["Graduate School of Science and Technology, Keio University, Yokohama, Japan","Graduate school of Science and Technology, Keio University, Yokohama, Japan"],"affiliations":[{"raw_affiliation_string":"Graduate School of Science and Technology, Keio University, Yokohama, Japan","institution_ids":["https://openalex.org/I203951103"]},{"raw_affiliation_string":"Graduate school of Science and Technology, Keio University, Yokohama, Japan","institution_ids":["https://openalex.org/I203951103"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5103508091","display_name":"Masao Nakagawa","orcid":"https://orcid.org/0000-0003-3831-9298"},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Masao Nakagawa","raw_affiliation_strings":["Graduate School of Science and Technology, Keio University, Yokohama, Japan","Graduate school of Science and Technology, Keio University, Yokohama, Japan"],"affiliations":[{"raw_affiliation_string":"Graduate School of Science and Technology, Keio University, Yokohama, Japan","institution_ids":["https://openalex.org/I203951103"]},{"raw_affiliation_string":"Graduate school of Science and Technology, Keio University, Yokohama, Japan","institution_ids":["https://openalex.org/I203951103"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5032592463"],"corresponding_institution_ids":["https://openalex.org/I203951103"],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.19532138,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"3","issue":null,"first_page":"1","last_page":"6"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10575","display_name":"Wireless Communication Networks Research","score":0.9998999834060669,"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"}},"topics":[{"id":"https://openalex.org/T10575","display_name":"Wireless Communication Networks Research","score":0.9998999834060669,"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/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9997000098228455,"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":0.9962000250816345,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/code-division-multiple-access","display_name":"Code division multiple access","score":0.6450941562652588},{"id":"https://openalex.org/keywords/orthogonality","display_name":"Orthogonality","score":0.6388702392578125},{"id":"https://openalex.org/keywords/bit-error-rate","display_name":"Bit error rate","score":0.5523918867111206},{"id":"https://openalex.org/keywords/interference","display_name":"Interference (communication)","score":0.5179940462112427},{"id":"https://openalex.org/keywords/rayleigh-fading","display_name":"Rayleigh fading","score":0.5022094249725342},{"id":"https://openalex.org/keywords/channel","display_name":"Channel (broadcasting)","score":0.49090248346328735},{"id":"https://openalex.org/keywords/code","display_name":"Code (set theory)","score":0.48886269330978394},{"id":"https://openalex.org/keywords/fading","display_name":"Fading","score":0.48767316341400146},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.48666292428970337},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.45728936791419983},{"id":"https://openalex.org/keywords/hadamard-code","display_name":"Hadamard code","score":0.44872021675109863},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.41973111033439636},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.4186716079711914},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.3264169692993164},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.1242908239364624}],"concepts":[{"id":"https://openalex.org/C47696715","wikidata":"https://www.wikidata.org/wiki/Q233394","display_name":"Code division multiple access","level":2,"score":0.6450941562652588},{"id":"https://openalex.org/C17137986","wikidata":"https://www.wikidata.org/wiki/Q215067","display_name":"Orthogonality","level":2,"score":0.6388702392578125},{"id":"https://openalex.org/C56296756","wikidata":"https://www.wikidata.org/wiki/Q840922","display_name":"Bit error rate","level":3,"score":0.5523918867111206},{"id":"https://openalex.org/C32022120","wikidata":"https://www.wikidata.org/wiki/Q797225","display_name":"Interference (communication)","level":3,"score":0.5179940462112427},{"id":"https://openalex.org/C56985126","wikidata":"https://www.wikidata.org/wiki/Q854039","display_name":"Rayleigh fading","level":4,"score":0.5022094249725342},{"id":"https://openalex.org/C127162648","wikidata":"https://www.wikidata.org/wiki/Q16858953","display_name":"Channel (broadcasting)","level":2,"score":0.49090248346328735},{"id":"https://openalex.org/C2776760102","wikidata":"https://www.wikidata.org/wiki/Q5139990","display_name":"Code (set theory)","level":3,"score":0.48886269330978394},{"id":"https://openalex.org/C81978471","wikidata":"https://www.wikidata.org/wiki/Q1196572","display_name":"Fading","level":3,"score":0.48767316341400146},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.48666292428970337},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.45728936791419983},{"id":"https://openalex.org/C26693338","wikidata":"https://www.wikidata.org/wiki/Q1567339","display_name":"Hadamard code","level":3,"score":0.44872021675109863},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.41973111033439636},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.4186716079711914},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.3264169692993164},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.1242908239364624},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.0},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/wcnc.2009.4917850","is_oa":false,"landing_page_url":"https://doi.org/10.1109/wcnc.2009.4917850","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2009 IEEE Wireless Communications and Networking Conference","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":13,"referenced_works":["https://openalex.org/W1555811655","https://openalex.org/W1575991793","https://openalex.org/W1906200282","https://openalex.org/W1967645388","https://openalex.org/W1987893292","https://openalex.org/W2098145421","https://openalex.org/W2110576705","https://openalex.org/W2112520289","https://openalex.org/W2138986309","https://openalex.org/W2144222355","https://openalex.org/W2146486977","https://openalex.org/W3128611524","https://openalex.org/W6634703331"],"related_works":["https://openalex.org/W1485487340","https://openalex.org/W2186577153","https://openalex.org/W1594724313","https://openalex.org/W2024145902","https://openalex.org/W1557880800","https://openalex.org/W2060596160","https://openalex.org/W1948034020","https://openalex.org/W2101630099","https://openalex.org/W2089133547","https://openalex.org/W2134561986"],"abstract_inverted_index":{"The":[0,33,71,139],"bit":[1],"error":[2],"rate":[3],"(BER)":[4],"performance":[5,158],"of":[6,42,73,87,99,116],"multicode":[7],"MC-CDMA":[8,30],"severely":[9],"degrades":[10],"due":[11],"to":[12],"the":[13,47,82,88,97,108,114,121,125,147,154],"inter-code":[14],"interference":[15,148],"(ICI)":[16],"in":[17,57,76,101,124,135,162],"a":[18,23,40,58,163],"strong":[19],"frequency-selective":[20,59,164],"channel.":[21,89,167],"In,":[22],"spreading":[24,74,131],"code":[25,43,48,62,137,151],"group":[26,78,103],"construction":[27],"method":[28],"for":[29],"was":[31],"proposed.":[32],"Walsh-Hadmard":[34],"(WH)":[35],"codes":[36,75,100,132],"are":[37],"divided":[38],"into":[39,145],"number":[41,72,98],"groups":[44,67,152],"such":[45],"that":[46,96],"orthogonality":[49],"can":[50,133],"be":[51],"maintained":[52],"within":[53],"each":[54,77,102,136],"subgroup":[55],"even":[56],"channel;":[60],"any":[61],"pair":[63],"taken":[64],"from":[65,149],"different":[66],"is":[68,79,104,142,159],"not":[69,105],"orthogonal.":[70],"determined":[80,106],"by":[81,107],"maximum":[83,109],"time":[84,110,117],"delay":[85,111,118],"difference":[86,112],"In":[90],"this":[91],"paper,":[92],"we":[93],"point":[94],"out":[95],"but":[113],"distribution":[115],"differences":[119],"among":[120],"propagation":[122],"paths":[123],"channel":[126],"and":[127,153],"thus,":[128],"more":[129],"orthogonal":[130],"exist":[134],"group.":[138],"conditional":[140],"BER":[141,157],"derived":[143],"taking":[144],"account":[146],"other":[150],"achievable":[155],"downlink":[156],"numerically":[160],"evaluated":[161],"Rayleigh":[165],"fading":[166]},"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}