Title: 4x4雙極化平面天線陣列架構在室內60GHz環境下之通道容量分析
Empirical MIMO Capacity of a 4x4 Dual-Polarized Planar Antenna Array in Indoor 60GHz channels
Authors: 江培立
Keywords: 60GHz;雙極化天線;多輸入多輸出系統;通道容量;60GHz;dual-polarized antenna;MIMO system;channel capacity
Issue Date: 2012
Abstract: 在這篇論文裡,我們使用雙極化平面貼片天線陣列架構在室內60GHz環境下進行通道容量分析。在室內60GHz環境下,雙極化天線不僅能夠解決貼片天線之死角問題,同時還能降低天線間之空間相關度以獲取多天線系統之好處。我們亦討論在此雙極化平面貼片天線陣列架構下要如何獲取較大之通道容量。由模擬結果發現,在低傳輸功率下應該使用波束指向之技術,在高傳輸功率下應該使用空間多工之技術。使用面對面相距兩公尺的傳送接收理論天線,同時通道中有直視路徑存在之條件下,傳輸功率的邊界值為-6.3dBm。當接收端在一個傳送極化之死角上以及傳送功率不高時,將功率集中至另一個傳送極化上會獲得一些好處。 最後,我們由一個光束覓跡通道模型轉換得到一個近似且簡單之Kronecker通道模型。
In this research work, we analyze the channel capacity in indoor 60GHz environment with the structure of dual-polarized patch antenna planar array. In indoor 60GHz environment, the dual-polarized antenna not only solves the dead zone problem of the patch antenna but also provides the low spatial correlations to enjoy the advantages of MIMO system. We also discuss how do we derive the larger channel capacity based on the structure of dualpolarized antenna planar array. We show that beamforming is suitable for the low transmit power, and multiplexing is suitable for the high transmit power. The boundary of transmit power is -6.3 dBm for existing the LOS path and using the face-to-face theoretically transmitter and receiver antennas which are separated by the distance of two meters. When receiver locates in the dead zone of one transmitted polarization, there are some benefits by focusing the power on the other transmitted polarization for the low transmit power. Moreover, we derive a not only simple but also approximate Kronecker model by the ray-tracing channel model.
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