智能天線利用數字信號處理技術在基帶動態產生空間定向波束，將天線方向圖主瓣對準有用信號到達方向，低增益副瓣對準干擾信號到達方向，借助有用信號和干擾信號在入射方向上的差異，選擇恰當的合并權值，從而達到充分利用移動用戶信號并抑制干擾信號的目的。智能天線相當于空時濾波器，在多個指向不同用戶的并行天線波束控制下，使信號在有限的方向區域發送和接收，從而提高頻譜利用效率，增大系統容量。

一、智能天線應用的關鍵技術

　　智能天線在移動通信中的應用分為移動臺和基站，本部分僅討論智能天線應用于基站的實現技術，其中智能化發射技術、接收技術和動態信道分配是３項關鍵的技術。

　?。保悄芑邮占夹g

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title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" title="ＣＤＭＡ">ＣＤＭＡ" 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        另一方面，為了給智能發射提供依據，在上行中還需要估計反映用戶空間位置信息的參量，如ＤＯＡ、空域特征（ＳＳ，ＳｐａｔｉａｌＳｉｇｎａｔｕｒｅ）等，它們的精度估計將直接影響到下行選擇性發送的性能。目前，完成智能化接收的方法主要有基于高分辨率陣列信號處理方法和基于信號時域結構方法兩類。前一類方法又分子空間方法和基于參數估計準則的方法兩大類。后一類方法主要利用信號的時域信息和先驗特征進行空域處理。

　?。玻悄芑l射技術

　　在蜂窩系統中，為滿足多媒體業務通信質量的要求，發射信號功率一定要動態控制，在保證整個蜂窩系統各小區的信號總功率平衡的情況下（各小區干擾基本穩定），滿足各種業務的不同傳輸速率和不同的誤碼率要求。

        智能化發射技術利用用戶的空間差異，保證每個用戶只接收基站發給它的下行信號，不受同一信道中基站發給其他用戶信號的干擾。實現智能化發射有基于反饋和基于上行鏈路參數估計兩種方法。前一種方法是基站通過移動臺返回基站的訓練信號，估計下行信道的響應情況，其缺點是浪費帶寬?；谏闲墟溌穮⒘抗烙嫷姆椒ㄊ抢靡恍┨卣鲄⒘肯鄬τ谏舷滦墟溌返牟蛔冃?，通過各用戶對上行信號的估計，確定下行鏈路的波束形成方案。ＴＤ－ＳＣＤＭＡ采用后一種方法。

         在時分雙工（ＴＤＤ）系統中，上、下行鏈路使用同一載波頻率，在信道特征變化相對較慢的情況下，可以近似認為上、下行鏈路的信道特征相同，可使用對上行信道的估計設置下行鏈路參數。在頻分雙工（ＦＤＤ）系統中，由于上、下行鏈路載頻不同，上、下行鏈路的信道特性差異很大，要分別估計上、下行鏈路特征，所以在ＦＤＤ系統中使用智能天線比在ＴＤＤ系統中使用要復雜得多，這也是ＴＤＤ系統較ＦＤＤ系統的優勢所在。

　?。常畡討B信道分配

　　在通信中，信道分配是保障通信質量、有效利用信道的關鍵技術之一。在空分信道引入系統后，空、頻、時和碼分信道的動態分配技術已成為新的技術難點。后三種信道分配技術是確定性的，可由系統根據用戶情況動態分配，但空分信道分配不同。在基站處，接收功率相差不大和用戶方向角度差大于天線主波瓣的用戶，可分享同一時、頻域信道。這樣，空分信道分配就成為動態的條件組合問題，且隨著用戶空間位置的移動，為跟蹤用戶，空分信道必須相應變化，隨時進行動態分配?？辗中诺婪峙浔仨毰c時、頻信道分配和切換相結合，這就需要形成一種高效算法，以適應用戶的移動性。對于ＣＤＭＡ系統，由于其容量是軟容量，信道分配相對簡單。智能天線本身具有功率控制功能，其性能要優于現有的功率控制技術。同時基站間的越區切換也將更為靈活。

二、下一代移動通信中的時空多用戶檢測技術

　　在下一代移動通信系統中，多用戶檢測（ＭＵＤ）是一項關鍵技術。ＭＵＤ利用多址干擾的信號結構特征，對所有的激活用戶進行聯合估計，可以明確估計出期望用戶的多址干擾，從而抑制多用戶干擾，從本質上解決遠近問題（ＮｅａｒＦａｒＰｒｏｂｌｅｍ）。然而多址干擾和無線信道具有明顯的空間結構特征，如果采用智能天線技術，將為干擾抑制提供新的維度。智能天線引入移動通信系統基站后，可以實現對移動用戶的定向發射和定向接收，能從空域上消除大量的多用戶干擾，并能減輕多徑效應。因此，利用時空多用戶檢測技術進行干擾抑制，將進一步提高系統性能。

        時域信息和空域信息的結合有級聯和聯合兩種方式。在時空級聯處理方法中，空間濾波器用來去除未被多用戶檢測器去除的多址干擾，能在一定程度上改善接收效果，但不能應用于過載情況。時空聯合處理方法將空域特征和時域特征等同看待，與傳統的時域多用戶檢測器相比增加了等效處理增益，提高了用戶特征之間的正交性，從而改善了接收機性能，且可以應用于過載系統中。因此，基于時空聯合處理方法性能優于級聯處理方法，但是其運算量大。

        在我國提出的第三代移動通信標準——ＴＤ－ＳＣＤＭＡ中實現了智能天線和聯合檢測（ＪＤ：ＪｏｉｎｔＤｅｔｅｃｔｉｏｎ）技術的有機結合。由于上行鏈路和下行鏈路具有相似的信道特性，所以ＴＤ－ＳＣＤＭＡ系統能夠把上行鏈路聯合檢測過程中獲得的沖擊響應估計值應用于下行鏈路，用類似于最大功率合成的方法實現下行智能天線自適應波束賦形算法，這是ＴＤ－ＳＣＤＭＡ系統智能天線算法的獨特之處。

        聯合檢測算法可以分為３類：非線性算法、判決反饋算法、線性算法。非線性算法主要有最大似然序列估計（ＭＬＳＥ），該算法極度復雜，在要求實時性的移動通信系統中難以應用。判決反饋算法是在線性算法基礎上經過一定的擴展得到，有迫零判決反饋均衡器算法（ＺＦ－ＢＤＦＥ）和最小均方誤差判決反饋均衡器算法（ＭＭＳＥ－ＢＤＦＥ），它們的計算復雜度較大。實際應用中，常采用線性算法。其原理是先用線性塊均衡器Ｍ對接收信號進行檢測，得到Ｋ個用戶發送符號的連續值估計，然后用Ｋ個量化器對這些連續值估計進行量化，就可得到對用戶發送符號的離散值估計。

        基于時空二維處理的智能天線和多用戶檢測相結合，是一種優勢互補的組合。在看到時空二維多用戶檢測器的巨大容量潛力的同時，也應該看到其優良的性能是以巨大的運算量為代價的。運算量大是時空二維多用戶檢測器實用化的主要障礙。研究快速算法將是今后時空二維多用戶檢測器研究工作的一個重點。

三、結束語

         在移動通信技術的發展中，智能天線已經成為一個最活躍的領域。智能天線技術可以充分利用無線資源的空間可分性，提高無線通信系統對無線資源的利用率，并從根本上提高系統容量。雖然實現智能天線還有許多問題有待研究解決，但可以預見智能天線將在未來的移動通信領域中大放異彩。