Aiming at the segmentation-based method to estimate the spreading sequences of non-periodic long code(LPC) direct sequence spread spectrum(DS-SS) signal

this paper presents a Fast-ICA based method to estimate the spreading sequence of CDMA signals with optimize segmentation blindly

which on the base of the mathematical analysis of long-code CDMA signal.And then

the segmentation criterion different from current method

which as small as possible to cost the jumping probability

is given.The method is not only applicable for synchronous short-code single- or multi-user DSSS signals

but also adoptive to non-periodic long-code single- or multi-user DSSS signals.At the same time

an effective segmentation method is given in this paper

mathematic analysis and simulation results demonstrate the validity of these methods.