【正文】 河北北方學(xué)院 畢業(yè)論文 題 目 ： 數(shù)字調(diào)制系統(tǒng)的 SIMULINK 實現(xiàn)研究 三種 基本調(diào)制制度的功率譜密度研究 院 系： 信息工程系 專 業(yè)： 信息工程 年 級： 07 級 河北北方學(xué)院教務(wù)處制 三種 基本調(diào)制制度的功率譜密度研究 摘 要 隨著通信系統(tǒng)的規(guī)模和復(fù)雜度不斷增加 ,傳統(tǒng)的設(shè)計方法已經(jīng)不能適應(yīng)發(fā)展的需要 ,通 信系統(tǒng)的模擬仿真技術(shù)越來越受到重視。而通信系統(tǒng)的計算機(jī)模擬仿真技 1 術(shù)是 一種 全新的 系統(tǒng)設(shè)計方法，它可以讓用戶在很短的時間內(nèi)建立整個通信系統(tǒng)模型，并對其進(jìn)行模擬仿真。 本文 首先介紹 了 SIMULINK應(yīng)用及通信技術(shù)的發(fā)展?fàn)顩r。 然后對 SIMULINK的工作原理及使用方法進(jìn)行闡述，接著介紹基本的數(shù)字調(diào)制系統(tǒng)并分析三種調(diào)制制度 2ASK、 2FSK和 2PSK的基本原理。再對三種調(diào)制制度的功率譜密度進(jìn)行分析，最后利用 SIMULINK建立系統(tǒng)模型對三種調(diào)制制度的功率譜密度進(jìn)行模擬仿真并分析結(jié)果。 關(guān)鍵詞： 調(diào)制制度 SIMULINK 功率譜密度 系統(tǒng)模型 Abstract As munications systems continue to increase in size and plexity, traditional design methods have been unable to meet the needs of development, munication system simulation technology more and more attention. Er Communication System Computer simulation technology is a new design method, which allows users in a very short period of time to establish the munication system model, and its 2 simulation. This paper introduces the application and munication technologies SIMULINK development. Then the working principle and the use of SIMULINK method described, then introduced the basic digital modulation systems and analyze the three modulation system 2ASK, 2FSK and 2PSK the basic principles. Remodulation system, the three power spectral density analysis, and finally create a system model using SIMULINK three modulation power spectral density of the system simulation and analysis results. Key words: Modulation system SIMULINK The power spectral density System Model 目錄 摘 要 ............................................................................................................................ 0 Abstract .......................................................................................................................... 1 ............................................................................................................................. 4 研究目的及意義 ..................................................................................................... 4 SIMULINK 簡介 ....................................................................................................... 5 3 通信技術(shù)發(fā)展?fàn)顩r ................................................................................................. 6 通信的概念 ...................................................................................................... 6 通信的發(fā)展史簡介 .......................................................................................... 8 通信技術(shù)的發(fā)展現(xiàn)狀和趨勢 ........................................................................... 8 本論文的任務(wù) ........................................................................................................ 9 研究內(nèi)容與安排 .................................................................................................... 9 2． SIMULINK 工作原理 ............................................................................................... 10 求解器 ..................................................................................................... 10 連續(xù)求解器 ................................................................................................... 10 離散求解器 ................................................................................................... 11 關(guān)于求解器的其他內(nèi)容 ................................................................................ 11 過零檢測和時間通知 ........................................................................................... 12 過零檢測 ...................................................................................................... 12 時間通知 ...................................................................................................... 14 代數(shù)環(huán) ................................................................................................................ 15 直接饋入電路（ direct feedthrough） ............................................................ 15 改善仿真的性能和精確度 .................................................................................... 15 加速仿真 ...................................................................................................... 16 改善仿真的精度 .......................................................................................... 17 本章小結(jié) ........................................................................................................... 17 3． 數(shù)字調(diào)制系統(tǒng)基本原理 ...................................................................................... 17 二進(jìn)制振幅鍵控 (2ASK) ......................................................................................... 18 2ASK 信號的功率譜密度 ............................................................................. 20 二 進(jìn)制移頻鍵控 (2FSK) ...................................................................................... 22 2FSK 信號的功率譜密度 ........................................................................... 25 二進(jìn)制移相鍵控 (2PSK) ..................................................................................... 27 2PSK 的功率譜密度 ................................................................................... 30 二進(jìn)制差分相位鍵控 (2DPSK) ............................................................................ 30 本章小結(jié) ........................................................................................................... 34 的模型建立和仿真 ................................................................................... 34 4 Suzuki 信道模型 ................................................................................................... 35 Suzuki 衰落分布 ............................................................................................. 35 Suzuki 信道模型 .......................................................................................... 35