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Article: A DS-CDMA system using despreading sequences weighted by adjustable chip waveforms
Title | A DS-CDMA system using despreading sequences weighted by adjustable chip waveforms |
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Authors | |
Keywords | Adjustable chip waveform DS-CDMA Multiple-access interference Noise whitening |
Issue Date | 1999 |
Publisher | I 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? |
Abstract | This 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 Identifier | http://hdl.handle.net/10722/42842 |
ISSN | 2023 Impact Factor: 7.2 2020 SCImago Journal Rankings: 1.468 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Huang, Y | en_HK |
dc.contributor.author | Ng, TS | en_HK |
dc.date.accessioned | 2007-03-23T04:33:13Z | - |
dc.date.available | 2007-03-23T04:33:13Z | - |
dc.date.issued | 1999 | en_HK |
dc.identifier.citation | Ieee Transactions On Communications, 1999, v. 47 n. 12, p. 1884-1896 | en_HK |
dc.identifier.issn | 0090-6778 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/42842 | - |
dc.description.abstract | This 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.extent | 439877 bytes | - |
dc.format.extent | 8772 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | I E E E. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=26 | en_HK |
dc.relation.ispartof | IEEE Transactions on Communications | en_HK |
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. | - |
dc.subject | Adjustable chip waveform | en_HK |
dc.subject | DS-CDMA | en_HK |
dc.subject | Multiple-access interference | en_HK |
dc.subject | Noise whitening | en_HK |
dc.title | A DS-CDMA system using despreading sequences weighted by adjustable chip waveforms | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+waveforms | en_HK |
dc.identifier.email | Ng, TS:tsng@eee.hku.hk | en_HK |
dc.identifier.authority | Ng, TS=rp00159 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1109/26.809709 | en_HK |
dc.identifier.scopus | eid_2-s2.0-0033280335 | en_HK |
dc.identifier.hkuros | 52554 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0033280335&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 47 | en_HK |
dc.identifier.issue | 12 | en_HK |
dc.identifier.spage | 1884 | en_HK |
dc.identifier.epage | 1896 | en_HK |
dc.identifier.isi | WOS:000084503300018 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Huang, Y=8118863900 | en_HK |
dc.identifier.scopusauthorid | Ng, TS=7402229975 | en_HK |
dc.identifier.issnl | 0090-6778 | - |