Smart antennas use the digital signal processing technologies to produce spatial and directional beam, then let the antenna's major lobe point to the coming direction of reference user and the side lobe point to the coming direction of interference user. 智能天线利用数字信号处理技术,产生空间定向波束,使天线主波束对准用户信号到达方向,旁瓣或零陷对准干扰信号到达方向,达到充分利用移动用户信号并抑制或删除干扰信号的目的。