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Article: Effect of imperfect channel estimation on transmit diversity in CDMA systems

TitleEffect of imperfect channel estimation on transmit diversity in CDMA systems
Authors
KeywordsChannel estimation
code-division multiple access (CDMA)
Rayleigh fading
space–time block coding (STBC)
spatial and multipath diversity
Issue Date2004
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=25
Citation
IEEE Transactions on Vehicular Technology, 2004, v. 53 n. 5, p. 1400-1412 How to Cite?
AbstractIn this paper, the effect of imperfect channel estimation on the transmit diversity based on space-time block coding for the downlink of a direct-sequence code-division multiple-access system is studied. Two transmit antenna and one receiving antennas are employed. However, the results of this paper can be extended to the system with more receiving antennas. Each channel is modeled as frequency-selective Rayleigh fading and the pair of channels corresponding to two transmit antennas are mutually independent. Both spatial diversity gain and multipath diversity gain are obtained in the system. The system performance is evaluated in terms of bit-error rate under the perfect and imperfect channel estimation. A pilot-assisted channel-estimation scheme with one common spreading code sequence is exploited. It is shown that the inaccurate channel estimates suffering from multiple access and multipath interference significantly degrade the system performance and can be effectively improved by use of a simple low-pass filter. The investigation of the power ratio of pilot to data channels illustrates that the base station should dynamically adjust the transmit power of the pilot channel according to the varying system configurations in order to achieve the best performance.
Persistent Identifierhttp://hdl.handle.net/10722/44811
ISSN
2015 Impact Factor: 2.243
2015 SCImago Journal Rankings: 1.203
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, XYen_HK
dc.contributor.authorWang, JZen_HK
dc.date.accessioned2007-10-30T06:10:44Z-
dc.date.available2007-10-30T06:10:44Z-
dc.date.issued2004en_HK
dc.identifier.citationIEEE Transactions on Vehicular Technology, 2004, v. 53 n. 5, p. 1400-1412en_HK
dc.identifier.issn0018-9545en_HK
dc.identifier.urihttp://hdl.handle.net/10722/44811-
dc.description.abstractIn this paper, the effect of imperfect channel estimation on the transmit diversity based on space-time block coding for the downlink of a direct-sequence code-division multiple-access system is studied. Two transmit antenna and one receiving antennas are employed. However, the results of this paper can be extended to the system with more receiving antennas. Each channel is modeled as frequency-selective Rayleigh fading and the pair of channels corresponding to two transmit antennas are mutually independent. Both spatial diversity gain and multipath diversity gain are obtained in the system. The system performance is evaluated in terms of bit-error rate under the perfect and imperfect channel estimation. A pilot-assisted channel-estimation scheme with one common spreading code sequence is exploited. It is shown that the inaccurate channel estimates suffering from multiple access and multipath interference significantly degrade the system performance and can be effectively improved by use of a simple low-pass filter. The investigation of the power ratio of pilot to data channels illustrates that the base station should dynamically adjust the transmit power of the pilot channel according to the varying system configurations in order to achieve the best performance.en_HK
dc.format.extent489053 bytes-
dc.format.extent2894 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=25en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©2004 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.en_HK
dc.subjectChannel estimationen_HK
dc.subjectcode-division multiple access (CDMA)en_HK
dc.subjectRayleigh fadingen_HK
dc.subjectspace–time block coding (STBC)en_HK
dc.subjectspatial and multipath diversityen_HK
dc.titleEffect of imperfect channel estimation on transmit diversity in CDMA systemsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0018-9545&volume=53&issue=5&spage=1400&epage=1412&date=2004&atitle=Effect+of+imperfect+channel+estimation+on+transmit+diversity+in+CDMA+systemsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/TVT.2004.833635en_HK
dc.identifier.scopuseid_2-s2.0-4744365758-
dc.identifier.isiWOS:000224037600010-

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