Blind channel estimation for space-time coded WCDMA

  • Authors:

  • Youngchul Sung;Lang Tong;Ananthram Swami

  • Affiliations:

  • School of Electrical and Computer Engineering, Cornell University, Ithaca, NY;School of Electrical and Computer Engineering, Cornell University, Ithaca, NY;Army Research Laboratory, 2800 Powder Mill Read, Adelphi, MD

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking - Special issue on multiuser MIMO networks
  • Year:
  • 2004

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Abstract

A new blind channel estimation technique is proposed for space-time coded wideband CDMA systems using aperiodic and possibly multirate spreading codes. Using a decorrelating front end, the received signal is projected onto a subspace from which channel parameters can be estimated up to a rotational ambiguity. Exploiting the subspace structure of the WCDMA signaling and the orthogonality of the unitary space-time codes, the proposed algorithm provides a blind channel estimate via least squares. A new identifiability condition is established under the assumption that the system is not heavily loaded. The mean square error of the estimated channel is compared with the Cramér-Rao bound, and the bit error rate (BER) performance of the proposed algorithm is compared with that of differential schemes.