使用混合式陣列天線於60GHz OFDM網路之傳輸量提升

Abstract

多載波使用正交多頻分工(orthogonal frequency division multiplexing; OFDM)已被提出在60 GHz頻段下作為調變的技術，我們已知此頻段通道對訊號有高路徑損失、高反射損失及其他衰減的問題，因而最近混合式陣列天線被提出以降低這些損失問題的影響。本論文在探討使用混合式陣列天線來增強系統吞吐量，首先我們提出一種考慮多個傳輸路徑的波束形成方法，此方法可以降低由於波束配對誤差所導致的效能衰減，接著我們提出L形線性陣列天線並發展一套簡單又有效的二維定位系統，進而再延伸至三維定位，最後我們提出一個排程系統，使得在多使用者的網路中，能進行平行傳輸達到最大的系統通道容量，並且由模擬結果顯示我們所提出的方法能有效地增強在60 GHz下 OFDM網路的吞吐量。

OFDM has been proposed to be a modulation technique in 60GH band. As known, this band is suffering from high path loss, high penetration loss, and other problems. Recently, hybrid antenna array has been proposed to alleviate these problems. This thesis aims to develop throughput enhancement techniques with hybrid antenna arrays. First, we propose a beamforming method taking multiple transmission paths (instead of one) into considerations. This method can reduce the performance loss due to erroneous beam-matching. Then, we propose an L-shaped antenna array and develop a simple yet effective two-dimensional localization scheme, which is extended to three-dimensional. Finally, we propose a scheduling scheme that can conduct parallel transmission to maximize system capacity in multiple user environments. Simulations show that the proposed methods can greatly enhance the throughput of 60GHz OFDM networks.