In this paper, we propose a minimum mean-squared error (MMSE) multiuser detector with an adaptive blind antenna array for synchronous direct sequence code division multiple access (DS/CDMA) systems. To suppress the multiple access interference (MAI), the proposed scheme utilizes the spatial distribution of the users as well as the time-domain processing; The numerical results show that the proposed scheme improves the performance without any extra information on the spatial distribution of the users. (C) 1999 Elsevier Science B.V. All rights reserved.