Blind chip-rate equalisation for DS-CDMA downlink receiver

S. Weiss, M. Hadef, M. Konrad, M. Rupp

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

10 Citations (Scopus)


A dispersive channel in the DS-CDMA downlink destroys the orthogonality of the synchronous users' spreading sequences. In this paper, we aim to reestablish this orthogonality blindly by means of a common chip-level equaliser. The adaptation algorithm is based on a constant modulus criterion forcing the various user symbols onto a constant modulus, for which a stochastic gradient descent algorithm is derived. This algorithm is structurally similar to a multiple error filtered-X LMS type approach, whereby the equaliser input CM update is replaced by a spreading code filtered version. Various simulations demonstrating the algorithm's convergence and noise performance are presented.
Original languageEnglish
Title of host publicationConference record of the 37th asilomar conference on signals, systems & computers
EditorsM.B. Matthews
Place of PublicationNew York
Number of pages5
ISBN (Print)0780381041
Publication statusPublished - 12 Nov 2003
Event37th Asilomar Conference on Signals, Systems and Computers - Pacific Grove, California, United States
Duration: 9 Nov 200312 Nov 2003


Conference37th Asilomar Conference on Signals, Systems and Computers
Country/TerritoryUnited States
CityPacific Grove, California
Other09 Nov - 12 Nov 2003


  • multiuser detection
  • LMS
  • signals
  • algorithm
  • blind
  • chip-rate
  • equalisation
  • ds-cdma
  • downlink receiver


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