陳琪芳臺灣大學:工程科學及海洋工程學研究所楊韋申Yang, Wei-ShenWei-ShenYang2010-07-142018-06-282010-07-142018-06-282009U0001-2907200912055800http://ntur.lib.ntu.edu.tw//handle/246246/188990就水下通訊而言,淺水環境面臨最大困難,是訊號受通道的多重路徑效應影響下,導致在振幅及相位失真。本論文是將水下通訊實驗進行量化分析,藉由分析結果把淡水河作為主要水下通訊的測試場。使用非線性決策迴授等化器主要目的為消除通道的符間干擾與補償原始訊號。本論文在淡水河作水下通訊實驗,利用線性與非線性等化器處理頻率8kHz資料傳輸速率每秒4K位元之二位元相位鍵移(BPSK)訊號,分析該訊號經過距離為50?190公尺之淺水環境通訊傳播成效,將實驗收到的訊號與高斯波束法模擬淺水環境相比下,了解整個淺水通道環境的影響情況。On the underwater communication, the major obstacle is multipath effects with the shallow water channel. Acoustic signals that propagate through shallow water channel are effected by amplitude distorsion and phase fluctuation. This paper is to quantify the underwater communication experiment analysis,the results of the analysis by the Tamshui River as a major underwater communication test area. The main objective of using the nonlinear equalizer(Decision Feedback Equalization,DFE) to eliminate Inter Symbol Interference(ISI) and compensated to the original signal. This paper presents an experimental analysis of shallow water channel measurements for transmission distance from 50m to 190m in the Tamshui River. The linear and nonlinear equalizer are used for BPSK signal frequency 8kHz with a bit rates of 4kbits/s , compared to Gaussian Beam Method(GBM) simulation of shallow water environment to understand the environment of shallow water channel.致謝及感言 II文摘要 IIIbstract IV錄 V表目錄 VIII一章 緒論 1.1 背景介紹 1.2 研究動機 1.3 研究目的 2.4 文獻回顧 2.5 主要結果 5二章 研究方法 7.1 運用適應性等化器 7.1.1 最小均方LMS演算法. 8.1.2 判別迴授等化DFE演算法. 9.2 多重路徑效應之分析 10.2.1 運用特徵聲線理論 10.2.2 運用高斯波束法理論 13.3 方法架構 13三章 淡水河實驗設計與執行 15.1實驗設置 16.2水槽測試 17.3淡水河實驗設計 18.3.1點對點實驗 18.3.2點對移動載台實驗 19四章 模擬與實驗數據分析 20.1模擬水下通道及解調 20.1.1隨機脈衝響應模擬-無編碼之訊號 21.1.2隨機脈衝響應模擬-隨機取樣之訊號 24.1.3高斯波束法理論模擬 27.1.3.1靜態水文環境下 29.1.3.2模擬水文環境加高斯雜訊-1 sequence 33.1.3.3模擬水文環境加高斯雜訊-30 sequence 39.2淡水河實驗-點對點 42.2.1點對點實驗-1 sequence 43.2.2點對點實驗-30 sequence 46.3實驗與模擬驗證 49.3.1實驗與模擬驗證-1 sequence 49.3.2實驗與模擬驗證-30 sequence 50.4淡水河實驗-點對移動載台 51五章 結論與未來工作 54考文獻 574914361 bytesapplication/pdfen-US多重路徑效應二位元相位鍵移決策回授等化器符間干擾高斯波束法MultipathBinary Phase Shift KeyingDecision Feedback EqualizationInter Symbol InterferenceGaussian Beam Method淡水河域水下通訊模擬與實驗研究Underwater Acoustic Communication Study in Tamshui Riverthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/188990/1/ntu-98-R96525059-1.pdf