Abstract: Firstly the signal model for W-CDMA is presented, and then the beam mode at MMSE criteria and the rationality and limit when fixed low-lobe beams are used asapproximation of Winer results. The partial adaptive algorithm usedbeam designing and DOA finding are put forward. The beam switching and comparing between the neighbor beams are applied to find the Direction Of Arriving(DOA)of waves. The benefit of this algorithm is the transmitting directionally at base stations can be reached, and the capability of forward link can be greatly improved.

Key words: CDMA, antenna arrays, beam designing, DOA