Effects of FDD on open-loop downlink eigen-beamforming in WCDMA mobile communication systems

  • Authors:

  • Antonis C. Koutalos;John S. Thompson

  • Affiliations:

  • Signals and Systems Group, School of Engineering and Electronics, University of Edinburgh, Mayfield Road, EH9 3JL Edinburgh, UK;Signals and Systems Group, School of Engineering and Electronics, University of Edinburgh, Mayfield Road, EH9 3JL Edinburgh, UK

  • Venue:
  • Signal Processing
  • Year:
  • 2004

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Abstract

This work examines the effects of the separation between the carrier frequencies of the uplink and downlink channels duc to frequency division duplex on the performance of open-loop downlink beamforming antenna array techniques that make use of eigenvectors as beamformers. The main effects are the de-correlation of the uplink and downlink eigenvectors and the performance loss, both of which are quantified. Also, a simple compensation technique is examined, and is shown to eliminate most of the performance loss.