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Article: A DS-CDMA system using despreading sequences weighted by adjustable chip waveforms

TitleA DS-CDMA system using despreading sequences weighted by adjustable chip waveforms
Authors
KeywordsAdjustable chip waveform
DS-CDMA
Multiple-access interference
Noise whitening
Issue Date1999
PublisherI E E E. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=26
Citation
Ieee Transactions On Communications, 1999, v. 47 n. 12, p. 1884-1896 How to Cite?
AbstractThis paper evaluates the performance of a direct-sequence code-division multiple-access system using coherent receivers in which the despreading sequences are weighted by adjustable chip waveforms. The chip weighting waveforms under consideration are designed for multiple-access interference (MAI) rejection. Assuming that the received chip waveforms are rectangular, new expressions for the signal-to-interference-plus-noise ratio (SINR) of the decision variable are derived when different weighted despreading sequences (WDS's) are used in the receiver. The novelty of the derived expressions is that each of the expressions, when the system parameters are given, is determined only by one parameter of the adjustable chip waveforms employed. As a result, we can simply tune the parameter to its optimal value in real-time for MAI rejection without knowing the other users' spreading codes, timing, and phase. The criterion for tuning the parameter is to maximize the SINR of the decision variable based on the relative strength between the additive Gaussian white noise and the MAI. Numerical results show that when the multiple-access interference is significant, the receivers using WDS's outperform significantly the conventional receiver using a rectangular despreading sequence. Brief analysis for band-limited spreading signals is also provided to reveal the practical implications of the proposed technique. © 1999 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/42842
ISSN
2015 Impact Factor: 2.298
2015 SCImago Journal Rankings: 1.659
References

 

DC FieldValueLanguage
dc.contributor.authorHuang, Yen_HK
dc.contributor.authorNg, TSen_HK
dc.date.accessioned2007-03-23T04:33:13Z-
dc.date.available2007-03-23T04:33:13Z-
dc.date.issued1999en_HK
dc.identifier.citationIeee Transactions On Communications, 1999, v. 47 n. 12, p. 1884-1896en_HK
dc.identifier.issn0090-6778en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42842-
dc.description.abstractThis paper evaluates the performance of a direct-sequence code-division multiple-access system using coherent receivers in which the despreading sequences are weighted by adjustable chip waveforms. The chip weighting waveforms under consideration are designed for multiple-access interference (MAI) rejection. Assuming that the received chip waveforms are rectangular, new expressions for the signal-to-interference-plus-noise ratio (SINR) of the decision variable are derived when different weighted despreading sequences (WDS's) are used in the receiver. The novelty of the derived expressions is that each of the expressions, when the system parameters are given, is determined only by one parameter of the adjustable chip waveforms employed. As a result, we can simply tune the parameter to its optimal value in real-time for MAI rejection without knowing the other users' spreading codes, timing, and phase. The criterion for tuning the parameter is to maximize the SINR of the decision variable based on the relative strength between the additive Gaussian white noise and the MAI. Numerical results show that when the multiple-access interference is significant, the receivers using WDS's outperform significantly the conventional receiver using a rectangular despreading sequence. Brief analysis for band-limited spreading signals is also provided to reveal the practical implications of the proposed technique. © 1999 IEEE.en_HK
dc.format.extent439877 bytes-
dc.format.extent8772 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherI E E E. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=26en_HK
dc.relation.ispartofIEEE Transactions on Communicationsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©1999 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.subjectAdjustable chip waveformen_HK
dc.subjectDS-CDMAen_HK
dc.subjectMultiple-access interferenceen_HK
dc.subjectNoise whiteningen_HK
dc.titleA DS-CDMA system using despreading sequences weighted by adjustable chip waveformsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0090-6778&volume=47&issue=12&spage=1884&epage=1896&date=1999&atitle=A+DS-CDMA+system+using+despreading+sequences+weighted+by+adjustable+chip+waveformsen_HK
dc.identifier.emailNg, TS:tsng@eee.hku.hken_HK
dc.identifier.authorityNg, TS=rp00159en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/26.809709en_HK
dc.identifier.scopuseid_2-s2.0-0033280335en_HK
dc.identifier.hkuros52554-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033280335&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue12en_HK
dc.identifier.spage1884en_HK
dc.identifier.epage1896en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridHuang, Y=8118863900en_HK
dc.identifier.scopusauthoridNg, TS=7402229975en_HK

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