Blind user detection in doubly dispersive DS/CDMA fading channels

  • Authors:
  • Stefano Buzzi;Luca Venturino;Alessio Zappone;Antonio De Maio

  • Affiliations:
  • DAEIMI, Università degli Studi di Cassino, Cassino, Italy;DAEIMI, Università degli Studi di Cassino, Cassino, Italy;DAEIMI, Università degli Studi di Cassino, Cassino, Italy;DIET, Università degli Studi di Napoli "Federico II," Napoli, Italy

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 2010

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Abstract

In this work, we consider the problem of detecting the presence of a new user in a direct-sequence/code-division-multiple-access (DS/ CDMA) system with a doubly dispersive fading channel, and we propose a novel blind detection strategy that only requires knowledge of the spreading code of the user to be detected, but no prior information as to the timevarying channel impulse response and the structure of the multiaccess interference. The proposed detector has a bounded constant false alarm rate (CFAR) under the design assumptions while providing satisfactory detection performance even in the presence of strong cochannel interference and high user mobility.