Blind Multiuser Detection with Array Observations

  • Authors:

  • Javier R. Fonollosa;Zoran Zvonar;José A. R. Fonollosa;Joan Català

  • Affiliations:

  • University Politècnica de Catalunya, Department of Signal Theory and Communications, Gran Capità s/n, 08034 Barcelona, Spain. E-mail: fono@gps.tsc.upc.es;Analog Devices, Communications division, Wilmington MA 01887–1024, USA. E-mail: Zoran.Zvonar@analog.com;University Politècnica de Catalunya, Department of Signal Theory and Communications, Gran Capità s/n, 08034 Barcelona, Spain. E-mail: fono@gps.tsc.upc.es;University Politècnica de Catalunya, Department of Signal Theory and Communications, Gran Capità s/n, 08034 Barcelona, Spain. E-mail: fono@gps.tsc.upc.es

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 1998

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Abstract

Cochannel interference is usually a major limitation to the performanceof mobile wireless systems. Examples of different forms of cochannel interference include multi-access interference in CDMA systems and cochannel interference resulting from frequency reuse in TDMA systems. Inorder to mitigate the interference from other users we present a blindmultiuser receiver which utilizes array observations and performs bothspatial and temporal processing of the received signal. The presentedtechnique is completely blind in the sense that no signature sequences,channel state or spatial location needs to be known a priori, nor use of atraining sequences, channel state or spatial location needs to be known apriori, nor use of a training sequence is required for the adaptation. Thediversity introduced by the array observations can be efficiently combinedwith the use of CDMA signature sequences. After initial convergence, areliable estimate of the combined temporal and spatial signature for eachuser is provided that can be employed by a multiuser receiver of lowercomplexity.