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    Title: Channel estimation for relay based cooperative communication systems
    Other Titles: 以中繼站為基礎的合作式通訊系統中通道估測之研究
    Authors: 顏進益;Yen, Chin-yi
    Contributors: 淡江大學電機工程學系碩士班
    易志孝;Yih, Chi-hsiao
    Keywords: 通道估測;合作式通訊;中繼傳輸;導引符號輔助調變;效能分析;Channel Estimation;cooperative communication systems;relay-based transmission;pilot symbol assisted modulation (PSAM);performance analysis
    Date: 2008
    Issue Date: 2010-01-11 07:01:07 (UTC+8)
    Abstract: 雖然許多探討基於中繼站的同調合作式通訊系統的研究已經顯示其可達到如多天線技術般使用空間分集之效益,稱之為合作分集;但是,這些研究分析主要是基於接收端可獲得完美的通道狀態資訊之假設。在實際應用情形下,通道狀態資訊必須經由估計取得且非完美通道狀態資訊對系統效能的影響也需要加以分析。在本篇論文中,我們探討採用放大轉傳模式的中繼站為基礎之合作式通訊系統並研究其通道估測問題。對於放大轉傳的傳輸機制而言,中繼站可以固定增益或變動增益來放大接收來自源端的訊號再進而傳送到終端。取決於中繼站的移動性,我們考慮固定端至移動端間通道之模型以及移動端至移動端間通道之模型。我們利用導引符號輔助調變(PSAM)來落實通道估測的工作,並把線性最小均方誤差(LMMSE)視為估測準則,再加以電腦模擬舉例說明非完美通道狀態資訊對採用放大轉傳模式的中繼站為基礎之合作式通訊系統所產生的影響。
    Although many researches on relay-based cooperative coherent communication systems have shown that the benefits of spatial diversity, saying cooperative diversity, can be achieved as the multi-antenna technologies do, the analyses primarily rely on the assumption that the perfect channel state information (CSI) is available at the receiver. In practical scenarios, the CSI has to be estimated and the effect of imperfect CSI on system performance needs to be analyzed. In this thesis, we study the channel estimation problem for amplify-and-forward (AF) relay-based cooperative communication systems. For AF transmission scheme, the relay amplifies the received signal from the source by a fixed or variable gain and forwards it to the destination. Depending on the mobility of the relay, we consider both the fixed-to-mobile channel model and the mobile-to-mobile channel model. To facilitate the channel estimation task, we employ the pilot symbol assisted modulation (PSAM) and consider the linear minimum mean-squared error (LMMSE) as the estimation criterion. Computer simulations are conducted to illustrate the influences of the imperfect CSI on the performance of AF relay-based communication systems.
    Appears in Collections:[電機工程學系暨研究所] 學位論文

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