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研究生:楊景閔
研究生(外文):Ching-Min Yang
論文名稱:無線區域網路中功率控制之研究
論文名稱(外文):A Research of Power Control Based on WLANs
指導教授:葉生正葉生正引用關係
指導教授(外文):Sheng-Cheng Yeh
學位類別:碩士
校院名稱:銘傳大學
系所名稱:資訊工程學系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:中文
論文頁數:77
中文關鍵詞:功率準位天線分集隨意存取薛南定律訊號雜訊比
外文關鍵詞:SNRPower LevelAntenna DiversityAd HocSha
相關次數:
  • 被引用被引用:2
  • 點閱點閱:158
  • 評分評分:
  • 下載下載:20
  • 收藏至我的研究室書目清單書目收藏:0
一般而言,無線區域網路(Wireless LAN,WLAN)具備了行動性、建置快速、彈性佳與低成本的優點C在行動性方面,行動裝置大多靠著電池來維持運作,然而電池的壽命有限,如何節省功率消耗與提供最大效能便是一個相當值得探討之議題。在此篇論文中,主要就是在無線區域網路之隨意存取(Ad Hoc)模式下進行功率控制的研究。首先是利用天線分集(Antenna Diversity)技術調變輻射場型(Radiation Pattern),改變天線發射無線電電波的方向,降低耗損的功率;接著在維持一定的服務品質(Quality of Service,QoS)下調節傳送訊號的功率準位(Power Level)高低,以降低多餘的功率浪費。其研究方法為基於在不同環境與距離所量測之訊號雜訊比(Signal-to-Noise Ratio, SNR),藉由薛南定律(Shannon Theorem)計算當前頻道的最大傳輸容量,再以此為依據動態調節天線幅射場型與傳輸功率準位,並持續回授分析找出適當的輻射場型與功率準位,以期能夠在最少的功率耗損下得到資料傳輸之一定效能。
In general, wireless local area networks (WLANs) have benefits of mobility, rapidly development, flexibility and low cost. In the mobility case, mobile devices often maintain an operation by a battery. However, the life of a battery is limited, it is worth to discuss and research this issue on how to save power consumption and support maximum efficiency. In this paper, the main aim is discussing the research of power control based on ad hoc WLAN. First, we use the antenna diversity technology to adopt the radiation pattern, change the radio direction that antenna transmitted, and then change the power level of antenna in transmission to avoid the unnecessary power consumption. The method is to measure the Signal-to-Noise Ratio (SNR) information in different environments and distances, calculate the channel maximum capacity by the Shannon theorem, and dynamicly modulate the antenna radiation pattern and transmission power level by the SNR. Then we will analyze and find the proper radiation pattern and power level to obtain the stable performance for data transmission at the minimum power consumption.
摘要
Abstract
誌謝
目錄
表目錄
圖目錄
第一章 緒論
  1.1 研究背景
  1.2 研究動機
  1.3 研究目的
  1.4 論文架構
第二章 相關研究與文獻探討
  2.1 天線分集技術
  2.2 功率控制方法
    2.2.1 IEEE 802.11電源管理模式
    2.2.2 IEEE 802.11h標準
第三章 研究環境與方法
  3.1 研究環境與平台
  3.2 研究方法與步驟
    3.2.1 教師研究室長廊
    3.2.2 國際會議廳
    3.2.3 遮蔽物與干擾物眾多的實驗室
第四章 研究結果與分析
  4.1 教師研究室長廊之功率調控結果分析
  4.2 國際會議廳之功率調控結果分析
  4.3 干擾源複雜實驗室之功率調控結果分析
  4.4 功率調控機制之說明
第五章 結論與未來展望
參考文獻
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