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Conference Paper: Effect of fast fading on hybrid detection in VSF-OFCDM systems

TitleEffect of fast fading on hybrid detection in VSF-OFCDM systems
Authors
KeywordsCommunications
Issue Date2004
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/conhome.jsp?punumber=1000104
Citation
Ieee International Conference On Communications, 2004, v. 6, p. 3294-3298 How to Cite?
AbstractThis paper presents an analytical study on the variable spreading factor (VSF) orthogonal frequency and code division multiplexing (OFCDM) system over a fast fading channel. Hybrid multi-code interference (MCI) cancellation and minimum mean square error (MMSE) detection is proposed in the system as an efficient way to eliminate MCI. It is shown that the optimum power ratio of pilot channel to one data channel is about 0.25K, where K is the total number of data channels. When the Doppler frequency fD is less than 200Hz, the effect of the Doppler on the system performance is negligible. However, increasing fD from 200Hz degrades the system performance rapidly. Although the gap in BER between the hybrid and pure MMSE detection decreases as fD increases, the gap is still large as long as fD is less than around 800Hz. For a wide range of Doppler shift, a larger frequency domain spreading factor (NF) is expected, whereas a smaller time domain spreading factor (NT) provides better performance when fD increases.
Persistent Identifierhttp://hdl.handle.net/10722/46498
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, Yen_HK
dc.date.accessioned2007-10-30T06:51:19Z-
dc.date.available2007-10-30T06:51:19Z-
dc.date.issued2004en_HK
dc.identifier.citationIeee International Conference On Communications, 2004, v. 6, p. 3294-3298en_HK
dc.identifier.issn0536-1486en_HK
dc.identifier.urihttp://hdl.handle.net/10722/46498-
dc.description.abstractThis paper presents an analytical study on the variable spreading factor (VSF) orthogonal frequency and code division multiplexing (OFCDM) system over a fast fading channel. Hybrid multi-code interference (MCI) cancellation and minimum mean square error (MMSE) detection is proposed in the system as an efficient way to eliminate MCI. It is shown that the optimum power ratio of pilot channel to one data channel is about 0.25K, where K is the total number of data channels. When the Doppler frequency fD is less than 200Hz, the effect of the Doppler on the system performance is negligible. However, increasing fD from 200Hz degrades the system performance rapidly. Although the gap in BER between the hybrid and pure MMSE detection decreases as fD increases, the gap is still large as long as fD is less than around 800Hz. For a wide range of Doppler shift, a larger frequency domain spreading factor (NF) is expected, whereas a smaller time domain spreading factor (NT) provides better performance when fD increases.en_HK
dc.format.extent472779 bytes-
dc.format.extent1965 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/conhome.jsp?punumber=1000104en_HK
dc.relation.ispartofIEEE International Conference on Communicationsen_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.subjectCommunicationsen_HK
dc.titleEffect of fast fading on hybrid detection in VSF-OFCDM systemsen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1044-4556&volume=6&spage=3294&epage=3298&date=2004&atitle=Effect+of+fast+fading+on+hybrid+detection+in+VSF-OFCDM+systemsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/ICC.2004.1313155en_HK
dc.identifier.scopuseid_2-s2.0-4143082899en_HK
dc.identifier.hkuros93028-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-4143082899&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume6en_HK
dc.identifier.spage3294en_HK
dc.identifier.epage3298en_HK

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