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The Use of Delay-Locked Loop Signals in DS/CDMA Receiver for Multiple-Access Interference Reduction.
- Source :
-
IEEE Transactions on Vehicular Technology . May2006, Vol. 55 Issue 3, p980-989. 10p. 3 Black and White Photographs, 3 Diagrams, 7 Graphs. - Publication Year :
- 2006
-
Abstract
- This paper presents a coherent demodulation scheme that reduces the multiple-access interference (MAI) considerably in a band-limited direct-sequence code-division multiple-access system. The despreading signal is obtained from a combination of the conventional despreading signal and its weighted early and late versions that are used in the delay-locked loop (DLL). It is shown that with appropriate choice of the weighting parameter of the early-late signals of the DLL, the signal-to-interference-plus-noise ratio of the decision variable is increased, which leads to improvement in the bit-error performance and hence the potential increase in the system capacity by about 25%. The analyses are performed in the frequency domain. The effect of imperfect synchronization on the system performance is also analyzed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189545
- Volume :
- 55
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Vehicular Technology
- Publication Type :
- Academic Journal
- Accession number :
- 21158844
- Full Text :
- https://doi.org/10.1109/TVT.2006.874575