%0 Journal Article %T Blind Channel Estimation for Space-Time Coded WCDMA %A Sung Youngchul %A Tong Lang %A Swami Ananthram %J EURASIP Journal on Wireless Communications and Networking %D 2004 %I Springer %X 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 Cram¨¦r-Rao bound, and the bit error rate (BER) performance of the proposed algorithm is compared with that of differential schemes. %K space-time coding %K long code CDMA %K least squares %K blind channel estimation %U http://jwcn.eurasipjournals.com/content/2004/471650