什麼是智慧型天線?
智慧型天線是一個系統,是於基地台使用『天線陣列』,結合『訊號處理』的
容量,在空間中創造濾波器。 圖一為智慧型天線系統組織表。
|
Figure
1 智慧型天線圖示 |
圖二對智慧型天線展示空間過濾能力,它能夠將二個信號從不同方向分離。在例
中是將信號從80。和 100。分離。
Figure 2 在空間領域中的濾波器
Figure 3 智慧型天線的容量 - 創造空間領域的濾波器(2-D)
智慧型天線的優點:
1、增益和干擾的減少
能創造出 space/antenna diversity |
|
能創造出 directional beamforming |
2、改善頻譜使用效率
利用"空間分割多重進取" |
參考資料:
[1] Lal C. Godara, "Application of Antenna Arrays to Mobile Communications, Part I:
Performance Improvement, Feasibility, and System Considerations," Proceeding of the IEEE, vol. 85, no. 7, pp. 1031-1060, July 1997.
[2] Lal C. Godara, "Application of Antenna Arrays to Mobile Communications, Part II:
Beamforming and Directional-of-Arrival Considerations," Proceeding of the IEEE, vol. 85, no. 8, pp. 1193-1245, August 1997.[3] Barry D. Van Veen and Kevin M. Buckley, "Beamforming: A versatile Approach to Spatial Filtering," IEEE ASSP Magazine, pp. 4-24, April 1988.