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Article: Performance comparison of optimum and MMSE receivers with imperfect channel estimation for VSF-OFCDM systems

TitlePerformance comparison of optimum and MMSE receivers with imperfect channel estimation for VSF-OFCDM systems
Authors
KeywordsChannel estimation
fading channels
minimum mean square error (MMSE)
orthogonal frequency division multiplexing (OFDM)
optimum receiver
Issue Date2005
PublisherIEEE.
Citation
IEEE Transactions on Wireless Communications, 2005, v. 4 n. 6, p. 3051-3062 How to Cite?
AbstractPerformances of optimum and minimum mean square error (MMSE) receivers for variable spreading factor orthogonal frequency and code division multiplexing (VSF-OFCDM) systems are compared in this paper. In VSF-OFCDM systems, the existence of multicode interference (MCI) in the frequency domain due to frequency-selective fading channels dramatically degrades the system performance. A quasi-analytic bit error rate performance is presented in the presence of imperfect channel estimations. Numerical results show that with linear computation complexity the MMSE receiver can improve system performance significantly by suppressing the MCI, although it cannot perform as well as the optimum receiver. Thus, with a small number of code channels, an optimum receiver can be employed to achieve better performance, whereas the MMSE receiver is suitable for a system with a large number of code channels due to simple complexity. In addition, the MMSE receiver is more robust than the optimum receiver to the different configurations of system parameters, e.g., spreading factors. Moreover, it is found that pilot channel power should be carefully assigned by making tradeoffs between the channel estimation quality and the received SNR for each code data channel.
Persistent Identifierhttp://hdl.handle.net/10722/44812
ISSN
2015 Impact Factor: 2.925
2015 SCImago Journal Rankings: 2.340
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXia, Ben_HK
dc.contributor.authorWang, JZen_HK
dc.contributor.authorSawahashi, Men_HK
dc.date.accessioned2007-10-30T06:10:45Z-
dc.date.available2007-10-30T06:10:45Z-
dc.date.issued2005en_HK
dc.identifier.citationIEEE Transactions on Wireless Communications, 2005, v. 4 n. 6, p. 3051-3062en_HK
dc.identifier.issn1536-1276en_HK
dc.identifier.urihttp://hdl.handle.net/10722/44812-
dc.description.abstractPerformances of optimum and minimum mean square error (MMSE) receivers for variable spreading factor orthogonal frequency and code division multiplexing (VSF-OFCDM) systems are compared in this paper. In VSF-OFCDM systems, the existence of multicode interference (MCI) in the frequency domain due to frequency-selective fading channels dramatically degrades the system performance. A quasi-analytic bit error rate performance is presented in the presence of imperfect channel estimations. Numerical results show that with linear computation complexity the MMSE receiver can improve system performance significantly by suppressing the MCI, although it cannot perform as well as the optimum receiver. Thus, with a small number of code channels, an optimum receiver can be employed to achieve better performance, whereas the MMSE receiver is suitable for a system with a large number of code channels due to simple complexity. In addition, the MMSE receiver is more robust than the optimum receiver to the different configurations of system parameters, e.g., spreading factors. Moreover, it is found that pilot channel power should be carefully assigned by making tradeoffs between the channel estimation quality and the received SNR for each code data channel.en_HK
dc.format.extent357052 bytes-
dc.format.extent2894 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©2005 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.subjectfading channelsen_HK
dc.subjectminimum mean square error (MMSE)en_HK
dc.subjectorthogonal frequency division multiplexing (OFDM)en_HK
dc.subjectoptimum receiveren_HK
dc.titlePerformance comparison of optimum and MMSE receivers with imperfect channel estimation for VSF-OFCDM systemsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1536-1276&volume=4&issue=6&spage=3051&epage=3062&date=2005&atitle=Performance+comparison+of+optimum+and+MMSE+receivers+with+imperfect+channel+estimation+for+VSF-OFCDM+systemsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/TWC.2005.857998en_HK
dc.identifier.scopuseid_2-s2.0-29144477581-
dc.identifier.isiWOS:000233783800045-

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