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研究生:陳俊宏
研究生(外文):Chun-Hung Chen
論文名稱:多通道分碼多工系統之多優先權排程策略研究
論文名稱(外文):Study of Multi-priority Queue Strategies for Multi-Channel CDMA Systems
指導教授:江松茶
指導教授(外文):Song-Char Jiang
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電機工程系碩士班
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:2004
畢業學年度:92
語文別:中文
論文頁數:56
中文關鍵詞:分碼多工多優先權排程策略服務品質
外文關鍵詞:CDMAmulti-priority queue strategiesquality of service (Qos)
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在現今或未來的行動網路中,使用者所需求的資料類型越來越多了,例如:數據、語音以及多媒體等不同類型的資料。在傳統佇列(Queue)中資料是按先進先出的方式來進行存取。但是,傳統佇列資料存取的方式,對於需求高服務品質的即時性資料會有太多的延遲時間,而達不到即時性資料服務品質的需求。在本論文裡,主要研究在多通道分碼多工的系統下,於基地台設定一個佇列,對於不同類型的資料給定不同的優先權值,依照這些優先權值做多優先權的排程策略,提供不同優先權資料的傳輸服務。以此方式來降低即時性資料的延遲時間以及封包丟棄率,達到不同類型資料服務品質的需求。由模擬的結果顯示,經由多優先權排程的即是性資料會比傳統佇列存取的方式,會有較低延遲時間以及封包丟棄率。
There is increasing more and more demand of mixed types traffic such as voice, data multimedia communication running in current and future mobile communications. Traditionally, those data traffic are treated in a first-in-first-out (FIFO) basis. However, such method obviously cannot meet the need of some real-time traffic such as voice or prioritized traffic which require bounded delay service. Based on the multi-channel code division multiple access (CDMA) systems, we proposed a queue strategy for the base station which may set up the prioritized value of the requested transmissions from the mobile station. Furthermore, the base station can schedule those transmissions and can select the suitable channels in terms of the priority values as well as the channel conditions to achieve both the transmission quality and the bounded-delay requirement. The simulation results show that our strategy can achieve better performance than the FIFO method in terms of both delay time and packer dropping rate.
圖目錄…………………………………………………………………..Ⅴ
表目錄……..……………………………………………………………Ⅶ
一、緒論……………………………………………………………………….1
1.1 研究動機…………………………..…………………………………1
1.2 研究目的……………………………………………………………..2
1.3 研究方法與內容……………………………………………………..2
1.4 各章提要……………………………………………………………..3
二、無線通道衰減特性……………………………………………………….4
2.1 大範圍衰減………………………………………………………….5
2.2 小範圍衰減……...…………………………………………………..7
2.3 Rayleigh衰減分佈…………………………………………………..8
三、CDMA技術介紹………………………………………………………..10
3.1 CDMA的源由..……………………………………………………10
3.2 CDMA 的概念…...………………………………………………...11
3.3 CDMA的技術…..…………………………………………………15
3.3.1 直序展頻(DS-CDMA)…………………………………………15
3.3.2 頻率跳躍展頻(FH-CDMA)……………………………………17
3.3.3 時間跳躍展頻(TH-CDMA)……………………………………19
四、系統架構…………………………………………………………………21
4.1 多通道分碼多工系統……..…………………………………………21
4.2 多優先權排程策略…………………………………………………..22
4.2.1一般優先權排程….…………..…………..……………………..24
4.2.2 高優先權排程………………..…………………………………25
五、模擬與討論……………………………………………………………….28
5.1 不考慮傳送資料通道衰減的模擬…………………………………29
5.2 考慮傳送資料通道衰減的模擬……………………………………38
六、結論………………………………………………………………………44
參考文獻……………………………………………………………………...45
參 考 文 獻
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