Performance of adaptive linear interference suppression in the presence of dynamic fading

Michael L. Honig*, Scott L. Miller, Mark J. Shensa, Lawrence B. Milstein

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Adaptive linear interference suppression for direct-sequence (DS) code-division multiple access (CDMA) is studied in the presence of time- and frequency-selective fading. Interference suppression is achieved with an adaptive digital filter which spans a single symbol interval. Both decision-directed and blind adaptive algorithms, which do not require a training sequence, are considered. Modifications to least squares adaptive algorithms are presented which are compatible with differential coding and detection. For frequency-selective fading, adaptive algorithms are presented based upon different assumptions concerning knowledge of the desired user's channel. Specifically, the cases considered are as follows: 1) perfect knowledge of the desired channel; 2) knowledge of only the relative path delays; and 3) knowledge of only one delay corresponding to the strongest path. Computer simulation results are presented which compare the performance of these algorithms with the analogous RAKE receivers. These results show that for case 3), even slow fading can cause a significant degradation in performance. Effective use of channel parameters in the adaptive algorithm reduces the sensitivity to fade rate, although moderate to fast fading can significantly compromise the associated performance gain relative to the RAKE receiver.

Original languageEnglish (US)
Pages (from-to)635-645
Number of pages11
JournalIEEE Transactions on Communications
Volume49
Issue number4
DOIs
StatePublished - Apr 1 2001

Keywords

  • CDMA
  • Differential detection
  • Fading
  • Interference suppression
  • Multipath

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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