Blind Channel Estimation for Space-Time Coded WCDMA. Issue 2 (22nd December 2004)

• Record Type: Journal Article
• Authors: Sung, Youngchul; Tong, Lang; Swami, Ananthram
• Is Part Of: EURASIP journal on wireless communications and networking. Volume 2004:Issue 2(2004)
• Page Start: 322
• Page End: 334
• Publication Date: 2004-12-22
• Subjects: space-time coding -- long code CDMA -- least squares -- blind channel estimation; Wireless communication systems -- Periodicals; Signal processing -- Periodicals; 621.38405
• DOI: 10.1155/S1687147204406070
• Languages: English
• ISSNs: 1687-1499

Abstract

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.