臺灣博碩士論文加值系統

隨著無線區域網路的應用更加豐富，無線區域網路產品測試技術要求變得更多。目前在評估產品的效能時常利用特定的房子或是辦公室地點來進行測試。然而，不同的房子或是辦公室會產生不同的環境，測試結果也會容易受到外在訊號的干擾，難以客觀地評估分析產品效能。空口（Over-the-Air, OTA）測試方法，訊號經由空中無線傳輸能夠真實模擬和使用者相同情況的環境，配合相對的通道模型進行量測，這是評估產品在真實的射頻通道條件中的吞吐量的最佳方法。然而，在建構空口測試設備時通道模擬器的購置成本將是一大瓶頸，因此空口測試仍被少數大廠獨佔。
因此本論文提出以軟體無線電（Software Defined Radio, SDR）平台將參考802.11p系統的正交分頻多工( Orthogonal Frequency-Division Multiplexing, OFDM )技術加入IEEE TGn通道模型來模擬傳統通道模擬器以降低測試之成本，並配合OTA測試方法在無反射實驗室內進行實驗來降低外在的干擾，以準確量測BER及RSSI等量測數值。
利用軟體定義無線電平台開發不僅能實際做訊號收發功能並能大幅降低成本，也可以自己定義通道模型未來可以利用此平台來發展更多通道模型進行更多測試。

Since the Wi-Fi option had become a must-have in smart phones, the applications of Wireless Local Area Network (WLAN) have been massively created. The fast evolution of the Wi-Fi performances complicates the device tests. At present, the conductive test is widely used in the industry while evaluating the WLAN products, however, this actually fails for obtaining the objective results. In contrast, the Over-the-Air (OTA) test method provides the optimal way to evaluate the performance of WLAN devices by having the tester and device communicated wirelessly along with the dedicated channel configurations used, such that to emulate the real performance of devices under real channel conditions in a chamber. Currently, the cost of channel emulator is a bottleneck while developing the OTA testing system, and therefore now few players dominates the entire OTA testing market.
In sight of this, in this thesis we disrupt the dominance by proposing a Software Defined Radio (SDR) based channel emulator along with IEEE TGn channel as the replacement of traditional channel emulators. With the NI LabVIEW as programming language, we develop the 802.11p physical layer function on one NI USRP 2921R SDR as the Device Under Test (DUT), and then we successfully conduct OTA tests for this DUT by developing the IEEE TGN channel emulation function on another NI USRP 2921R SDR. With the nature of OTA testing, the interference outside the chamber is isolated such that the BER and RSSI can be accurately measured.
The use of SDR is a cost-effective solution while developing OTA testing systems, and the proposed SDR based channel emulator will be upgraded with more channel model.

摘　要 i
ABSTRACT iii
誌　謝 v
目　錄 vi
表目錄 viii
圖目錄 ix
第一章 序論 1
1.1研究背景與動機 1
1.2章節介紹 1
第二章無線區域網路系統介紹 6
2.1無線區域網路系統介紹 6
2.2系統介紹 7
第三章 IEEE TGn通道模型實作設計 10
3.1軟體定義無線電 10
3.1.1 NI通用軟體無線電週邊設備 11
3.1.2 NI LabVIEW軟體簡介 12
3.2多重路徑傳播效應 13
3.3通道模型介紹 15
3.4通道模擬產生方法 17
第四章 無線區域網路系統通道模擬器OTA量測 20
4.1反射實驗室介紹 20
4.2傳統無線區域網路效能量測 24
4.3軟體定義無線電通道模擬器OTA量測系統 27
4.3.1 無反射實驗室外通道模擬器OTA量測結果 27
4.3.2 無反射實驗室內通道模擬器OTA量測結果 31
第五章 總結 38
參考文獻 39

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