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Article: Downlink transmission of broadband OFCDM systems - Part V: Code assignment
Title | Downlink transmission of broadband OFCDM systems - Part V: Code assignment | ||||
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Authors | |||||
Keywords | Code assignment Doppler shift Hybrid detection Multi-code interference OFDM Two-dimensional spreading | ||||
Issue Date | 2008 | ||||
Publisher | IEEE. | ||||
Citation | Ieee Transactions On Wireless Communications, 2008, v. 7 n. 11, p. 4546-4557 How to Cite? | ||||
Abstract | To 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 Identifier | http://hdl.handle.net/10722/58823 | ||||
ISSN | 2023 Impact Factor: 8.9 2023 SCImago Journal Rankings: 5.371 | ||||
ISI Accession Number ID |
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 Field | Value | Language |
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dc.contributor.author | Zhou, Y | en_HK |
dc.contributor.author | Wang, J | en_HK |
dc.contributor.author | Ng, TS | en_HK |
dc.date.accessioned | 2010-05-31T03:37:32Z | - |
dc.date.available | 2010-05-31T03:37:32Z | - |
dc.date.issued | 2008 | en_HK |
dc.identifier.citation | Ieee Transactions On Wireless Communications, 2008, v. 7 n. 11, p. 4546-4557 | en_HK |
dc.identifier.issn | 1536-1276 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/58823 | - |
dc.description.abstract | To 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.language | eng | en_HK |
dc.publisher | IEEE. | en_HK |
dc.relation.ispartof | IEEE Transactions on Wireless Communications | en_HK |
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.subject | Code assignment | en_HK |
dc.subject | Doppler shift | en_HK |
dc.subject | Hybrid detection | en_HK |
dc.subject | Multi-code interference | en_HK |
dc.subject | OFDM | en_HK |
dc.subject | Two-dimensional spreading | en_HK |
dc.title | Downlink transmission of broadband OFCDM systems - Part V: Code assignment | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+assignment | en_HK |
dc.identifier.email | Zhou, Y:yqzhou@eee.hku.hk | en_HK |
dc.identifier.email | Ng, TS:tsng@eee.hku.hk | en_HK |
dc.identifier.authority | Zhou, Y=rp00214 | en_HK |
dc.identifier.authority | Ng, TS=rp00159 | en_HK |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1109/T-WC.2008.070392 | en_HK |
dc.identifier.scopus | eid_2-s2.0-57149133098 | en_HK |
dc.identifier.hkuros | 164442 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-57149133098&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 7 | en_HK |
dc.identifier.issue | 11 | en_HK |
dc.identifier.spage | 4546 | en_HK |
dc.identifier.epage | 4557 | en_HK |
dc.identifier.isi | WOS:000260946300019 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Zhou, Y=7405367062 | en_HK |
dc.identifier.scopusauthorid | Wang, J=11439898400 | en_HK |
dc.identifier.scopusauthorid | Ng, TS=7402229975 | en_HK |
dc.identifier.issnl | 1536-1276 | - |