通信原理仿真試驗報告

1、通信原理仿真實驗報告學院通信工程學院班 級1401014班分組參 數(shù) .資料.目的：（1）熟悉（）通信系統(tǒng)的工作原理、電路組成和信息傳輸特點；（2）熟悉上述通信系統(tǒng)的設計方法與參數(shù)選擇原則；（3）掌握使用參數(shù)化圖符模塊構建通信系統(tǒng)模型的設計方法；（4）熟悉各信號時域波形特點；（5）熟悉各信號頻域的功率譜特點。實驗內(nèi)容一：（1）使用m序列為數(shù)字系統(tǒng)輸入調(diào)試信號，采用正弦載波，碼速率及載波 頻率參見附表；（2）采用模擬調(diào)制或數(shù)字檢控實現(xiàn)2PSK調(diào)制；（3）通過相干解調(diào)完成2PSKW調(diào)，恢復初始m序列；（4）從時域觀測各信號點波形，獲得接收端信號眼圖；（5）觀測各信號功率譜；（6）完成串并及并串轉換

2、模塊設計；實驗內(nèi)容二：（7）通過不少于三個頻率正弦信號疊加而成的模擬信號作為系統(tǒng)真實輸入 信號，并采用PCM編碼方法實現(xiàn)數(shù)模轉換；（8）模擬輸入信號轉換形成的數(shù)字信號通過 2PSK調(diào)制解調(diào)系統(tǒng)實現(xiàn)數(shù)字頻帶傳輸;(9) 通過PCM解碼恢復初始模擬信號;(10) 從時域重點觀測模擬信號點波形;(11) 從頻域重點觀察模擬信號功率譜。通信模擬信號的數(shù)字傳輸通信系統(tǒng)的組成框圖如圖1所示。系統(tǒng)輸入的模擬隨機信號m(t)，經(jīng)過該通信系統(tǒng)后要較好地得到恢復。模擬抽樣r量化數(shù)字譯碼和低題倍息源f*和編碼1通信系統(tǒng)旳模擬晞機信號數(shù)字規(guī)機序列數(shù)字陵機序列模擬隨機信號推薦方案：推薦的模擬信號數(shù)字頻帶傳輸通信系統(tǒng)的組

3、成框圖如圖2所示。通過PCM方式完成數(shù)模與模數(shù)變換，采用 2/BPSK調(diào)制方式完成基本數(shù)字頻帶傳輸。在2PSK中，通常用初始相位0和 分別表示二進制“ 1”和“ 0”。因此, 2PSK信號的時域表達式為：勺ps瓦二_ 0,發(fā)送0時弘兀發(fā)送T時勺PSK=True Output = 1 vFalse Output = 0 vA In put = t10 Output 0B In put = t33 Output 0Max Rate = 700e+3 Hz33Source:Sinu soidAmp = 0 vFreq = 56e+3 HzPhase = 0 degOutput 0 = Si net1

4、1Output 1 = Cosi neMax Rate (Port 0)= 700e+3 Hz12Operator:SamplerIn terpolat ingRate = 700e+3 HzAperture =0 secAperture Jitter = 0 secMax Rate =700e+3 Hz13Operator:HoldLast ValueGai n = 1Out Rate =700e+3 HzMax Rate =700e+3 HzPCM仿真結果及分析:電路圖:串并2A|IB1 ad1 =i：1 =.HeI(7O o OODD18 |gj1ru BIZQ Iga二 10=1 1O

5、C=1 1gfe20gDI ao n :I =.1LjQ O ODDOggZ2ogo JDDHte23 Iklo 2 oODDSbS3 |iqnal ft 13JTima 1 n SacoiikSysiemVitwPiwar Mpg trs - zF甘!ptcTL,!i if 唇詢上 si jnil (d!r- 50Wavel I1fDc*1*!崎 HE!* 1B&c1* B&t*P”qMf n Ee l囲1-舸理卜圖符參數(shù)設置:編號名稱參數(shù)0Source:Sinu soidAmp =1vFreq = 1e+3 HzPhase = 0 degOutput 0 = Si net3Output 1

6、 = Cos ineMax Rate (Port 0)= 1.3e+6 Hz1Source:Sinu soidAmp =1vFreq = 500 HzPhase = 0 degOutput 0 = Si net3Output 1 = Cos ineMax Rate (Port 0)= 1.3e+6 Hz2Source:Sinu soidAmp = 2 vFreq = 800 HzPhase = 0 degOutput 0 = Si net3Output 1 = Cos ineMax Rate (Port 0)= 1.3e+6 Hz3Adder:NonParametricIn puts from

7、 t0p0 t1p0 t2p0Outputs to4 6Max Rate = 1.3e+6 Hz6Comm:Compa nderA-LawMax In put = 5Max Rate = 1.3e+6 Hz8Logic:ADCTwos Compleme ntGate Delay = 0 secThreshold = 500e-3 vTrue Output = 1 vFalse Output = 0 vNo. Bits = 8Min In put = -5 vMax In put = 5 vRise Time = 0 secAn alog = t6 Output 0Clock = t14 Out

8、put 014Source:Pulse TrainAmp =1vFreq = 3.25e+3 HzPulseW = 62.5e-6 secOffset = -500e-3 vPhase = 0 degMax Rate = 1.3e+6 Hz1623Operator:SamplerIn terpolat ingRate = 32.5e+3 HzAperture = 0 secAperture Jitter = 0 secMax Rate = 32.5e+3 Hz41Comm:TD MuxNo. I nputs = 8Time per In put = 308e-6 secTime Slot 0

9、= t32 Output 0Time Slot 1 = t33 Output 0Time Slot 2 = t34 Output 0Time Slot 3 = t35 Output 0Time Slot 4 = t36 Output 0Time Slot 5 = t37 Output 0Time Slot 6 = t38 Output 0Time Slot 7 = t39 Output 0Max Rate = 260e+3 Hz43Operator:HoldLast ValueGai n = 1Out Rate = 1.3e+6 HzMax Rate = 1.3e+6 Hz45Comm:TD

10、DeMuxNo. Outputs=8Time per Output = 308e-6 secOutput 0 =Time Slot 0t9Output 1 =Time Slot 1t9Output 2 =Time Slot 2t9Output 3 =Time Slot 3t9Output 4 =Time Slot 4t9Output 5 =Time Slot 5t9Output 6 =Time Slot 6t9Output 7 =Time Slot 7t9Max Rate (Port 0)=162.5e+3Hz9Logic:DACTwos Compleme ntGate Delay = 0 secThreshold=500e-3 vNo. Bits =8Min Outpul=-5 vMax Output = 5 vD-0 = t45 Output 0D-1 = t45 Output 1D-2 = t45 Output 2D-3 = t45 Output 3D-4 = t45 Output 47Comm:D