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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44676
標題: | 水聲通訊之估測錯誤對於以通道估測為基礎之可適性等化器的影響 The Impact of Estimation Error on Channel Estimation-Based Equalizer for UWA Channel |
作者: | Jing-Luen Liao 廖經倫 |
指導教授: | 曹建和(Jenho Tsao) |
關鍵字: | 等化器,水下聲通訊,通道估測, equlizer,underwater acoustic communication,channel estimation, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 海洋是一隨著不同時間及空間持續在改變的傳導環境,而其水下聲音傳播的頻率只在較低頻率時才有較好的效果,且其可供通訊用的有效頻寬往往被極度的限制。而水下聲通訊和陸地上的無線電通訊主要有兩個差異:其一是水聲通道有相當長的多重路徑延遲,其範圍可包含十到一百多個符號。另一是其通道會隨著時間快速的變化。
由於水聲通道的傳播特性,其信號處理往往會變得高度的複雜,為了減少其計算複雜度,因此基於其物理通道的特性去設計接收器是必要的。 基於通道估測的可適性等化器-是依據事先估測其通道的參數並利用此估測來消除掉此通道後軌帶來的符元間干擾,最後再通過線性等化器。這篇論文探討了通道估測的錯誤對於等化器的效能影響。 Underwater acoustic channels are generally recognized as one of the most difficult communication media in use today. The ocean is a time and spatially varying propagation environment. The underwater acoustic propagation is best supported at low frequencies, and the bandwidth available for communication is extremely limited. The underwater acoustic communication differ from RF communication in two aspects: One is the long multipath delay time that containing ten to hundreds of symbols, and the other is the rapid time variation of underwater acoustic channel. The receiver structure that has been found useful in many applications is a decision-feedback equalizer(DFE). Due to the nature of the propagation channel, the required signal processing is often prohibitively complex, to reduce computational complexity of signal processing, the receiver structures that are matched to the physical channel characteristics are investigates. A channel estimation-based equalization which relies on an adaptive channel estimation to compute its parameters, this estimation is used to cancel the post-cursor ISI before the linear equalization. The impact of estimation error on the channel estimation-based equalizer are investigated. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44676 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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