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In this work we propose the blind adaptive decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems in frequency selective channels. Closed-form expressions for the design of blind DF DS-CDMA receivers are presented. Blind adaptive stochastic gradient (SG) and recursive least-squares (RLS) type algorithms are developed for use with the constrained minimum variance (CMV) and constrained constant modulus (CCM) receivers along with successive and parallel DF structures. Numerical results show significant performance gains for the proposed blind DF receivers.