【正文】 基于 MATLAB 的最佳基帶傳輸系統(tǒng)分析 摘 要 20世紀 60 年代出現(xiàn)了數(shù)字傳輸技術(shù)，它采用了數(shù)字信號來傳遞信息，從此通信進入了數(shù)字化時代。數(shù)字通信系統(tǒng)主要的兩種通信模式 :數(shù)字 頻 帶傳輸通信系統(tǒng)，數(shù)字 基帶傳輸通信系統(tǒng)。本文主要研究通信系統(tǒng)中的關鍵技術(shù)－數(shù)字基帶傳輸，基帶系統(tǒng)在數(shù)字通信中有重要的代表性。主要包括基帶系統(tǒng)的結(jié)構(gòu)、傳輸?shù)姆绞郊盁o碼間干擾條件的特性研究。在綜合考慮信道的加性噪聲干擾及限帶信道會引起碼間干擾的這兩方面因素，并研究其最佳基帶傳輸?shù)陌l(fā) 送及接收濾波的設計問題。本文還著重的研究基于MATLAB 語言的數(shù)字基帶傳輸特性，通過 MATLAB 設計并仿真基帶系統(tǒng)，在比較實測系統(tǒng)與理論研究的基礎上加深了對基帶傳輸特性的理解。 關鍵詞： 數(shù) 字 基帶傳輸， 碼間干擾，時域均衡 Based on MATLAB the best baseband transmission system analysis Abstract 20 emerged in the 1960s digital transmission technology, its adoption of a digital signal to transmit information, from munications to enter the digital era. Digital Communication System39。s two dominant mode of munication: digital transmission bandwidth munications systems, digital baseband transmission munications systems .The text introduces mostly about key technology of correspondence system which is numeric baseband transmission， it is an important representative. The baseband transmission，includes structure of the correspondence system and its transmit manner and the condition of without Intercode interference. Channel considered in the increase of noise interference, and with limited channel will cause interference between the two yards factors, and study their best baseband transmission sending and receiving the design of the filter. In following ， the text emphasize studies numeric baseband transmission baseon MATLAB language and we use it to design and imitate baseband system.， we pare truetest system with theoretic system， so we get more understanding in the field of baseband transmission. Keywords： digital baseband。code of interference。time domain balanced 目 錄 1 引言 ........................................................................................................................................ 4 問題的提出及研究意義 ................................................................................................... 4 問題 的提出 ................................................................................................................ 4 研究的意義 ................................................................................................................ 4 國內(nèi)外研究現(xiàn)狀 ........................................................................................................... 4 2 數(shù)字基帶系統(tǒng)的簡介及其實現(xiàn)方法 .................................................................................... 5 數(shù)字基帶系統(tǒng)的簡介 ...................................................................................................... 5 數(shù)字基帶信號 ............................................................................................................ 5 數(shù)字基帶傳輸 ............................................................................................................ 6 數(shù)字基帶傳輸系統(tǒng) .................................................................................................... 6 數(shù)字基帶傳輸?shù)囊蠹俺Ｓ么a型 ............................................................................ 8 MATLAB 簡介 ................................................................................................................. 8 MATLAB 語句 ........................................................................................................... 8 MATLAB 在通信系統(tǒng)中的仿真 ............................................................................. 10 3 基帶傳輸系統(tǒng)特性的研究 .................................................................................................. 12 基帶傳 輸 的功率譜研究 ................................................................................................ 12 眼圖在基帶傳輸系統(tǒng)的應用 ........................................................................................ 14 基帶傳輸 中的時域均衡技術(shù) ........................................................................................ 16 基帶系統(tǒng)的基帶傳輸特性 ............................................................................................ 18 升余弦滾降傳輸特性 .............................................................................................. 18 部分響應系統(tǒng) .......................................................................................................... 19 數(shù)字信號的最佳接收 .................................................................................................... 21 基帶系統(tǒng)的最佳化 ........................................................................................................ 23 綜合基帶傳輸系統(tǒng)的設計及仿真 ................................................................................ 23 4 結(jié)語 ...................................................................................................................................... 26 參考文獻 .................................................................................................................................. 27 致 謝 ....................