In this paper

We first present four data-selected schemes based on chip-matched filter for the multiuser receiver in multipath CDMA channels

and study the impact of these schemes on multiple-access interference (MAI) and inter-symbol interference (ISI).Then

we present the least mean-square (LMS) blind space-time multiuser detection method based on the Rosen's gradient projection

and analyze the effect of these schemes on the computational complexity of the presented detection method.Finally

we provide a reasonable and realizable method by analyzing the results of the simulations

and this method has the advantages of lowering the computational complexity

therefore it is interesting for application.