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dc.contributor.authorChen, CJen_US
dc.contributor.authorWang, LCen_US
dc.date.accessioned2014-12-08T15:38:50Z-
dc.date.available2014-12-08T15:38:50Z-
dc.date.issued2004-07-01en_US
dc.identifier.issn0018-9545en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TVT.2004.830941en_US
dc.identifier.urihttp://hdl.handle.net/11536/26585-
dc.description.abstractOne of the key advantages for the time-division duplex (TDD) system is the capability to deliver asymmetric traffic services by allocating different numbers of uplink and downlink time slots. However, in a TDD/code-division multiple-access (CDMA) system, asymmetric traffic may result in severe opposite-direction interference because downlink transmitted signals from neighboring base stations may interfere with the uplink received signals of the home cell. In this paper, we investigate the effect of four-antenna beamforming schemes from the perspective of suppressing the opposite-direction interference. We compare the uplink bit energy-to-interference density ratio of a traditional beam-steering technique (Scheme 1) with that of the minimum-variance distortionless-response (MVDR) beamformer (Scheme 11). Furthermore, Scheme III applies the conventional beam-steering technique for both downlink transmissions and the uplink reception. In Scheme IV, we implement beam-steering for downlink transmissions, while adopting the MVDR beamformer to process the uplink signals received at base stations. Our numerical results indicate that Scheme IV outperforms all the other three schemes, which can effectively suppress the strong opposite-direction interference in TDD/CDMA systems. While keeping low implementation costs in mind, employing the simpler Scheme HI in a sectorized cellular system can also allow every cell to provide different rates of asymmetric traffic services.en_US
dc.language.isoen_USen_US
dc.subjectadaptive arraysen_US
dc.subjectbeamformingen_US
dc.subjectcode-division multiple-access (CDMA)en_US
dc.subjectland mobile cellular systemsen_US
dc.subjecttime-division switchingen_US
dc.titleSuppressing opposite-direction interference in TDD/CDMA systems with asymmetric traffic by antenna beamformingen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TVT.2004.830941en_US
dc.identifier.journalIEEE TRANSACTIONS ON VEHICULAR TECHNOLOGYen_US
dc.citation.volume53en_US
dc.citation.issue4en_US
dc.citation.spage956en_US
dc.citation.epage967en_US
dc.contributor.department交大名义发表zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.identifier.wosnumberWOS:000222884400002-
dc.citation.woscount7-
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