Long-term krylov-prefilter for reduced-dimension receive processing in DS-CDMA systems

Guido Dietl, Michael Joham, Wolfgang Utschik, Josef A. Nossek

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Currently, long-term channel properties are only used for reduced-dimension processing in eigen sub-spaces. In this paper, we introduce a prerake at the transmitter in the uplink of a Direct Sequence (DS) CDMA system with non-orthogonal codes in order to exploit long-term channel properties for reduced-dimension Wiener filtering in Krylov subspaces at the receiver. Simulation results show that Krylov outperforms eigen prefiltering with and without previous correlation. Moreover, long-term is better than or equal to short-term processing except for optimal filtering in Krylov subspaces assuming multipath environments.

Original languageEnglish
Pages (from-to)492-495
Number of pages4
JournalIEEE Vehicular Technology Conference
Issue number1
StatePublished - 2002
Event56th Vehicular Technology Conference - Vancouver, BC, Canada
Duration: 24 Sep 200228 Sep 2002


  • Adaptive filtering
  • Long-term channel properties
  • Multi-stage nested wiener filter
  • Non-orthogonal codes
  • Reduced-rank equalization
  • Space-time processing
  • Wireless communications


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