The use of delay-locked loop signals in DS/CDMA receiver for multiple-access interference reduction | IEEE Journals & Magazine | IEEE Xplore

The use of delay-locked loop signals in DS/CDMA receiver for multiple-access interference reduction

Publisher: IEEE

Abstract:

This paper presents a coherent demodulation scheme that reduces the multiple-access interference (MAI) considerably in a band-limited direct-sequence code-division multip...View more

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.
Published in: IEEE Transactions on Vehicular Technology ( Volume: 55, Issue: 3, May 2006)
Page(s): 980 - 989
Date of Publication: 31 May 2006

ISSN Information:

Publisher: IEEE

References

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