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研究生:趙宣安
研究生(外文):Hsuan-AnChao
論文名稱:在軟體定義無線電實驗平台實現並評估分散式合作自動重複要求協定之效能
論文名稱(外文):Implementing and Evaluating Distributed Cooperative ARQ Protocols in Software-Defined Radio Testbed
指導教授:劉光浩
指導教授(外文):Kuang-Hao Liu
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電腦與通信工程研究所
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:2012
畢業學年度:100
語文別:英文
論文頁數:149
中文關鍵詞:合作式自動重複要求協定通道資訊同步分散型
外文關鍵詞:Cooperative ARQCSIsynchronizationdistributed
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  • 點閱點閱:128
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合作自動重複要求協定是最近被提出來的技術,目的是為了達到更可靠的
傳輸,它在接收端有錯誤時,藉由要求傳送端和中繼站重傳資料封包來延伸了傳
統自動重複要求協定。然而,在大部分存在的研究當中,合作自動重複要求協定
都被建立在理論上的分析和電腦模擬。通常,在模擬時會有很多不合理的假設。
像是,接收端有著完美的通道資訊,或著系統是以完美的同步去運行,等等。為
了去評估合作自動重複要求協定的精確效能增益,一個真實使用合作自動重複要
求協定的實驗平台就很重要。
在我們的論文中,以分散式系統的模式實現了四個自動重複要求協定,分別
是暫停並等待、合作暫停並等待、選擇性重複、合作選擇性重複。以上提到的協
定,都被建立GNU Radio 和通用軟體無線電外設上,它是一個有前景而且開放
式的軟體定義無線電平台。我們在軟體和硬體方面闡述了實現的原理。為了評估
不同的自動重複要求協定的效能,本研究進行了多項且廣泛的實驗,結果顯示了
雖然合作式通訊可以如預期提升傳輸的可靠度,可達到的增益主要由自動重複要
求協定主宰,像是選擇性重複在效率上表現的比暫停並等待協定好。
To improve transmission reliability, the cooperative automatic repeat request (C-ARQ) protocol is a recently proposed technique, which extends the traditional ARQ protocol by requesting either the source or the relay to retransmit the data packet if required. However, most of the existing works are built on theoretical analysis or computer simulations. Commonly, there are some impractical assumptions in simulations. For example, perfect channel state information (CSI) is available at the receiver, perfect synchronization can be achieved, and so on. To evaluate the exact performance gain of C-ARQ schemes, a real testbed for C-ARQ is of timely importance.
In this work, we implement four ARQ protocols in a distributed manner, including stop and wait (SW), cooperative stop and wait (C-SW), selective repeat (SR), and cooperative selective repeat (C-SR). All the aforementioned protocols are built based on GNU Radio and USRP2, which is a promising open-source software-de ned radio system. We elaborate the implementation principles, including both software and hardware aspects. Extensive experiments are conducted to evaluate the performance of the considered ARQ schemes. The results show that although cooperative communication can enhance the transmission reliability as expected, the achievable gain is dominated by the characteristics of ARQ protocol, where SR outperforms SW in terms of efficiency.
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