2dpsk數(shù)字調(diào)制器的研究與設(shè)計_畢業(yè)論文-全文預(yù)覽
【正文】 調(diào)制器的分析方法與方法 [5]。下面我們就設(shè)計相移鍵控的單元電路的各個部分，對 2DPSK 的基帶信號進行調(diào)制，得到調(diào)制以后 對應(yīng)的基帶信號 [4]。對于有線線路商行較高的數(shù)據(jù)傳輸速率，可能發(fā)生 4個或 8個不同的相移，系統(tǒng)要求在接收機上有精確和穩(wěn)定的參考相位來分辨所使用的各種相位。近十年來，隨著計算機，人工智能，模式識別和信號處理技術(shù)的飛速發(fā)展。 關(guān)鍵詞 ： 數(shù)字通信 數(shù)字調(diào)制 相移鍵控 相對相移鍵控 II Abstract Digital phase modulation is widely used in the field of is a kind of basic phase shift usually have two ways to realize the modulation:multiplier method and the phase selection phase selection method is adopted to realize PSK modulation in this methods are introduced to realize circuit diagram discussesed design of circuit that is the phase selection method to realize 2DPSK integrated chip 74HC4051 is adopted as the phase selection switch which can be controlled by 3bit digital signals so that a channel signal is selected from eight analog of two switch is only used for this paper .High and low level of a digital signal are used to choose one of the signals, that selectes the initial carrier phase that is 0 degrees or 180 order to the modulation of 2DPSK modulation is the design of the other circuit unit are introduced in this paper,including low pass filter circuit, amplifying circuit and the formation of carrier modulation, and the output circuitof ,The whole design of the electrical schematic diagram is pleted by using the Protel. Key word: Digital Communication Digital Modulation Phase Shift Keying Relative Phase Shift Keying III 目 錄 摘 要 .................................................................I Abstract................................................................II 目 錄 ...............................................................III 緒 論 .................................................................1 1 總體方案設(shè)計 .........................................................2 2PSK 的乘法器實現(xiàn) ..................................................2 2PSK 的相位選擇法的實現(xiàn) ............................................3 相對調(diào)相 ...........................................................3 2 單元電路設(shè)計 .........................................................6 低通濾波器設(shè)計 .....................................................6 載波放大與形成電路 .................................................6 模擬開關(guān) MC74HC4051 介紹（ 2DPSK 調(diào)制器） ............................7 調(diào)制輸出電路設(shè)計 ..................................................8 差分編碼器電路設(shè)計 ................................................8 3 Protel 99 SE 介紹 ....................................................9 protel 99se 主要的功能模塊 ........................................10 protel 99se 的組成 ................................................10 protel 99se 的基本操作 ............................................10 電路原理總圖 .....................................................11 結(jié)束語 ................................................................13 參考文獻 ..........................................................
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