無線區域接取網路之效能品質分析

在本篇論文中，主要針對無線接取網路之量測與相關效能進行分析，並且驗證在透過多重天線與高增益天線技術，可以有效改善系統效能並且提高商用運轉之可行性。首先於實驗室內建置一套支援多天線傳輸技術並且符合標準 IEEE 802.11 b/g無線傳輸協定為基礎之無線傳輸系統。我們利用 IEEE 802.11b/g 協定之無線網路基地台，並且搭配標準之傳輸線以及天線元件，透過射頻以及數據量測儀器針對各元件之效能進行分析，並且計算出該系統基本之效能參數。針對既有系統提出改善計畫，更換全向性高增益天線以及低耗損訊號傳輸線，利用量測儀器確認網路流量、抖動等效能參數，最後透過調整MIMO天線之間距讓系統達到最佳效能狀態。在分析相關測試結果後發現，改善過後的系統可以有效提高網路涵蓋率並且維持一定程度之傳輸效能。並且與Hata Model所估算的系統涵蓋範圍大約有50%左右的效能提昇。無線網路訊號在透過改善過後的傳輸系統之後，可以大幅提昇WLAN基地台網路涵蓋範圍，並且可以提供良好的網路頻寬服務，改善後的系統已經足以應付上網以及高畫質影音傳送等商用運轉需求。

關鍵字

無線區域接取網路；網路量測；多重天線；乙太網路品質

並列摘要

This paper will discuss for Wireless Local Access Network (WLAN) system measurement. With Multi-Input Multi-output (MIMO) technology and modify system parameters, we also enhance system performance to reach commercial use purpose. First at all, we setup a WLAN transmission environment which comply IEEE 802.11b/g standard in the Lab with standard antenna and accessories. With the Spectrum analyzer, reference RF card and Network analyzer, we can calculate the basic performance parameters for this WLAN system. Then we propose the upgrade plan for existing system. We can replace standard accessories by high performance antenna, low loss RF cable and connector to increase EIRP. And changing the antenna lambdas and related system parameters to extend cover area and maintain transmission performance. Finally, we successfully deploy the 2.4GHz commercial Public WLAN network and come out positive consultation. We successful extend WLAN signal covery area and can still maintain excellent throughput, BER and packet jitter to provide Internet and video transmission service. This system can also extend more that 50% network cover area than Hata Model.

並列關鍵字

MIMO ； Network Measurement ； QoS ； Wireless LAN

參考文獻

[9] Kyōhei Fujimoto, James R. James, "Mobile Antenna Systems Handbook," Artech House, 2001, pp. 128-129.

[11] A. Medeisis, A.Kajackas, On the Use of the Universal Okumura-Hata Propagation Prediction Model in Rural Areas, IEEE Vehicular Technology Conference Proceeding, Vol. 3, May 2000, pp. 450-453.

[12] S.Saunders, "Antennas and Propagation for Communication Systems," Wiley, 2000, pp.409.

[14] IETF, RFC 2544, "Benchmarking Methodology for Network Interconnect Devices," 1999.

[1] R.E.Ziemer, W. H. Tranter, "Principles of Communications," Houghton Mifflin, Fourth Edition, pp.1-18.

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無線區域接取網路之效能品質分析

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