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Conference Paper: Robustness of space-time codes in the presence of channel estimation errors in OFDM systems

TitleRobustness of space-time codes in the presence of channel estimation errors in OFDM systems
Authors
KeywordsCommunications
Radio
Issue Date2004
PublisherIEEE.
Citation
Ieee International Symposium On Personal, Indoor And Mobile Radio Communications, Pimrc, 2004, v. 1, p. 285-289 How to Cite?
AbstractMany space-time codes (STC) have been proposed to enhance the performance of wireless communications in flat fading channels. All of them rely on the knowledge of the channel, and are hence affected by the channel estimation errors. In this paper, we investigate STC robustness under imperfect channel knowledge. We first define the concept of "closeness" by comparing the BER under channel estimation errors with that under perfect channel knowledge, aiming to characterize STC performance degradation due to imperfect channel knowledge. Then the robustness of STC can be compared by their "closeness" to perfect results. We find that for systems with two and three transmit antennas, the space time block codes (STBC) are always more robust to channel estimation errors than space time trellis codes (STTC). With the increase of receive diversity, all STCs become more robust to the channel estimation errors. For STTC, as the number of trellis states increases, the codes become less robust to the channel estimation errors. We also compare the BER performance of STC in the presence of channel estimation errors. For the two-transmit-antenna system, the performance of STBC is always better than that of the 4-state STTC, but is always worse than 16-state STTC. For systems with three transmit antennas, the BER performance of STTC is much better than that of STBC.
Persistent Identifierhttp://hdl.handle.net/10722/45814
References

 

DC FieldValueLanguage
dc.contributor.authorDiao, Zen_HK
dc.contributor.authorShen, Den_HK
dc.contributor.authorLi, VOKen_HK
dc.date.accessioned2007-10-30T06:36:08Z-
dc.date.available2007-10-30T06:36:08Z-
dc.date.issued2004en_HK
dc.identifier.citationIeee International Symposium On Personal, Indoor And Mobile Radio Communications, Pimrc, 2004, v. 1, p. 285-289en_HK
dc.identifier.urihttp://hdl.handle.net/10722/45814-
dc.description.abstractMany space-time codes (STC) have been proposed to enhance the performance of wireless communications in flat fading channels. All of them rely on the knowledge of the channel, and are hence affected by the channel estimation errors. In this paper, we investigate STC robustness under imperfect channel knowledge. We first define the concept of "closeness" by comparing the BER under channel estimation errors with that under perfect channel knowledge, aiming to characterize STC performance degradation due to imperfect channel knowledge. Then the robustness of STC can be compared by their "closeness" to perfect results. We find that for systems with two and three transmit antennas, the space time block codes (STBC) are always more robust to channel estimation errors than space time trellis codes (STTC). With the increase of receive diversity, all STCs become more robust to the channel estimation errors. For STTC, as the number of trellis states increases, the codes become less robust to the channel estimation errors. We also compare the BER performance of STC in the presence of channel estimation errors. For the two-transmit-antenna system, the performance of STBC is always better than that of the 4-state STTC, but is always worse than 16-state STTC. For systems with three transmit antennas, the BER performance of STTC is much better than that of STBC.en_HK
dc.format.extent384494 bytes-
dc.format.extent4152649 bytes-
dc.format.extent23319 bytes-
dc.format.extent5489 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.relation.ispartofIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRCen_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.subjectRadioen_HK
dc.titleRobustness of space-time codes in the presence of channel estimation errors in OFDM systemsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLi, VOK:vli@eee.hku.hken_HK
dc.identifier.authorityLi, VOK=rp00150en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.scopuseid_2-s2.0-11244289537en_HK
dc.identifier.hkuros105438-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-11244289537&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume1en_HK
dc.identifier.spage285en_HK
dc.identifier.epage289en_HK
dc.identifier.scopusauthoridDiao, Z=8415199800en_HK
dc.identifier.scopusauthoridShen, D=7401738166en_HK
dc.identifier.scopusauthoridLi, VOK=7202621685en_HK

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