A method and receiver for reducing a signal (B) interfering with a broadband spread-spectrum signal (A) reaching a receiver (100), the receiver (100) including an interference signal (B) reduction system (20) incorporating an automatic gain controller (21), said method characterized in that the controller (21) continuously carries out a normalization (B′) of an instantaneous peak amplitude of the signal (B), wherein said instantaneous peak amplitude is constant in time for the signal thus normalized (B′).