A synchronous acquisition scheme is presented for DS-UWB receiver in the presence of multiuser and indoor multipath channel environment.It utilizes the delay spread characteristics of the dense multipath channel when the impulse radio signals pass through the channel

introduces the adaptation equalization algorithm with random training sequence

and searches the major energy region using variable synchronous step length and MMSE criteria.The characteristics of the algorithm are analyzed on theories and simulations

which show the scheme realizes the quick synchronization in indoor environment.