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Article: Downlink transmission of broadband OFCDM systems - Part V: Code assignment

TitleDownlink transmission of broadband OFCDM systems - Part V: Code assignment
Authors
KeywordsCode assignment
Doppler shift
Hybrid detection
Multi-code interference
OFDM
Two-dimensional spreading
Issue Date2008
PublisherIEEE.
Citation
Ieee Transactions On Wireless Communications, 2008, v. 7 n. 11, p. 4546-4557 How to Cite?
AbstractTo provide high speed mobile services, orthogonal multi-code transmission is employed in the orthogonal frequency and code division multiplexing (OFCDM) system. However, in a wireless frequency selective channel either with or without Doppler shift, code orthogonality is distorted and multi-code interference (MCI) is caused. The variance of the MCI is dependent on which codes to be used. This paper investigates the code assignment in the OFCDM system, aiming to mitigate the MCI. The code assignment can be explored in terms of the code distance defined in this paper. Generally, the codes with large code distances to each other should be assigned with high priority. Moreover, to avoid large interference from the powerful code-multiplexed pilot channel, the time spreading code adjacent to the pilot code in the code tree [9] is suggested not be used when the time domain spreading factor is large. The performance of the proposed non-sequential code assignment scheme is analytically evaluated. It has been shown that the system performance can be improved significantly by the non-sequential scheme under various channel conditions, especially when a low to medium system load is assumed. © 2008 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/58823
ISSN
2015 Impact Factor: 2.925
2015 SCImago Journal Rankings: 2.340
ISI Accession Number ID
Funding AgencyGrant Number
The University of Hong Kong Research Committee
Funding Information:

This work was supported by The University of Hong Kong Research Committee. The authors would like to thank Dr. M. Sawahashi, Dr. K. Higuchi, Dr. H. Atarashi, and Dr. N. Maeda from NTT DoCoMo, Japan, for their early helpful discussions.

References

 

DC FieldValueLanguage
dc.contributor.authorZhou, Yen_HK
dc.contributor.authorWang, Jen_HK
dc.contributor.authorNg, TSen_HK
dc.date.accessioned2010-05-31T03:37:32Z-
dc.date.available2010-05-31T03:37:32Z-
dc.date.issued2008en_HK
dc.identifier.citationIeee Transactions On Wireless Communications, 2008, v. 7 n. 11, p. 4546-4557en_HK
dc.identifier.issn1536-1276en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58823-
dc.description.abstractTo provide high speed mobile services, orthogonal multi-code transmission is employed in the orthogonal frequency and code division multiplexing (OFCDM) system. However, in a wireless frequency selective channel either with or without Doppler shift, code orthogonality is distorted and multi-code interference (MCI) is caused. The variance of the MCI is dependent on which codes to be used. This paper investigates the code assignment in the OFCDM system, aiming to mitigate the MCI. The code assignment can be explored in terms of the code distance defined in this paper. Generally, the codes with large code distances to each other should be assigned with high priority. Moreover, to avoid large interference from the powerful code-multiplexed pilot channel, the time spreading code adjacent to the pilot code in the code tree [9] is suggested not be used when the time domain spreading factor is large. The performance of the proposed non-sequential code assignment scheme is analytically evaluated. It has been shown that the system performance can be improved significantly by the non-sequential scheme under various channel conditions, especially when a low to medium system load is assumed. © 2008 IEEE.en_HK
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.relation.ispartofIEEE Transactions on Wireless Communicationsen_HK
dc.rightsIEEE Transactions on Wireless Communications. Copyright © IEEE.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.-
dc.subjectCode assignmenten_HK
dc.subjectDoppler shiften_HK
dc.subjectHybrid detectionen_HK
dc.subjectMulti-code interferenceen_HK
dc.subjectOFDMen_HK
dc.subjectTwo-dimensional spreadingen_HK
dc.titleDownlink transmission of broadband OFCDM systems - Part V: Code assignmenten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1536-1276&volume=7&issue=11&spage=4546&epage=4557&date=2008&atitle=Downlink+transmission+of+broadband+OFCDM+systems+-+Part+V:+Code+assignmenten_HK
dc.identifier.emailZhou, Y:yqzhou@eee.hku.hken_HK
dc.identifier.emailNg, TS:tsng@eee.hku.hken_HK
dc.identifier.authorityZhou, Y=rp00214en_HK
dc.identifier.authorityNg, TS=rp00159en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1109/T-WC.2008.070392en_HK
dc.identifier.scopuseid_2-s2.0-57149133098en_HK
dc.identifier.hkuros164442en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57149133098&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume7en_HK
dc.identifier.issue11en_HK
dc.identifier.spage4546en_HK
dc.identifier.epage4557en_HK
dc.identifier.isiWOS:000260946300019-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhou, Y=7405367062en_HK
dc.identifier.scopusauthoridWang, J=11439898400en_HK
dc.identifier.scopusauthoridNg, TS=7402229975en_HK

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