Fully adaptive weight value updating method and device for array antenna

The present invention discloses a fully adaptive weight value updating method and device for array antenna. Within the time section of receiving frequency guide signal, the frequency guide symbol from higher hierarchy is frequency expanded with the frequency expanding code corresponding to the sending end and the frequency expanding sequence is used as reference sequence. The array weight value is updated in steepest descent algorithm with the received sequence after descrambling and before dispreading and containing frequency guide data as the input sequence according to one minimal mean-square error. Using the method and device of the present invention can simplify system, inhibit system interference and lower system cost.