研究生: |
林安笛 Lin, An-Dee |
---|---|
論文名稱: |
Exploiting Multiuser Diversity in Random Access Cooperative Networks 多使用者分集技術在合作式隨機存取網路之應用 |
指導教授: |
洪樂文
Hong, Yao-Win Peter |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
電機資訊學院 - 通訊工程研究所 Communications Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 英文 |
論文頁數: | 50 |
中文關鍵詞: | 合作式通訊 、通道感知的傳輸控制 、時槽式ALOHA網路 |
相關次數: | 點閱:2 下載:0 |
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最近幾年來,多使用者與合作式分集增益已用於增進無線網路的可靠度和傳輸效能。這些分集技術通常需要對使用者進行集中式的管理,但可能要消耗非常多資源來實現。一些基於傳統時槽式-ALOHA隨機存取協定中的分散式技術在過去已開發出來,並分別享有上述兩項的分集優勢。多使用者分集架構能大幅增加系統流通量的原因是在每個時槽中讓擁有最好通道狀況的使用者進行傳輸。合作式分集的架構則是讓使用者在通道狀況不好時,可以利用合作伙伴提供的轉送通道來達到更高的流通量。這些分集增益可同時用分散式的方式來達成,作法是允許使用者互相合作將封包轉送到目地端。同時它採取一種通道感知的傳輸控制讓使用者可以依據他本身的直達通道與使用者間的狀況來動態地調整傳輸機率。我們推導在連續以及量化狀態的傳輸模式限制下,有兩個合作使用者的系統之滿載穩定區(fully-loaded stability region)並將其結果推廣至擁有任意多使用者的合作群。
我們發現最佳的傳輸控制擁有步階函式的形式,亦即當本地的通道狀況足夠讓等效接收機率高時,使用者就會進行傳輸。反之使用者就會保持沈默並試著接收來自合作伙伴的封包。藉由模擬結果可印證我們提出的連續狀態以及有限狀態傳輸方式都能明顯地增進在其對應限制下,整體網路的效能。甚至再探討總和流通量時,系統的效能直逼理想通道的環境。
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