中南大學(xué)通信原理matlab課程設(shè)計報告

通信原理課程設(shè)計報告通信1005班實(shí)驗(yàn)?zāi)康耐ㄐ旁韺?shí)驗(yàn)是針對通信工程專業(yè)學(xué)生的實(shí)踐教學(xué)環(huán)節(jié)，通過這一環(huán)節(jié)，可使學(xué)生鞏固相關(guān)課程知識，增強(qiáng)動手能力，提高學(xué)生對通信系統(tǒng)的仿真技能。在強(qiáng)調(diào)基本原理的同時，更突出設(shè)計過程的鍛煉，強(qiáng)化學(xué)生的實(shí)踐創(chuàng)新能力。選題：第二題、碼型變換的仿真實(shí)現(xiàn)Ⅰ、基本任務(wù)：原始PCM脈沖編碼信號的AMI碼型和CMI碼型變換。主要步驟和要求：（1）把原始的PCM脈沖編碼信號轉(zhuǎn)換成適合在信道中傳輸?shù)腁MI碼型。要求PCM碼可以是數(shù)字型也可以是字符型，要求畫出AMI碼型變換前后的波形圖。（2）把原始的PCM脈沖編碼信號轉(zhuǎn)換成適合在信道中傳輸?shù)腃MI碼型。要求PCM碼可以是數(shù)字型也可以是字符型，要求畫出CMI碼型變換前后的波形圖。Ⅱ、選做任務(wù)：原始PCM脈沖編碼信號的HDB3碼型轉(zhuǎn)換。主要步驟和要求：把原始的PCM脈沖編碼信號轉(zhuǎn)換成適合在信道中傳輸?shù)腍DB3碼型。要求PCM碼可以是數(shù)字型也可以是字符型；要求保證輸入的PCM脈沖編碼信號中1的個數(shù)為偶數(shù)；要求畫出HDB3碼型變換前后的波形圖。設(shè)計原理AMI碼AMI(AlternativeMarkInversion)碼的全稱是信號交替反轉(zhuǎn)碼，是通信編碼中的一種，為極性交替翻轉(zhuǎn)碼，分別有一個高電平和低電平表示兩個極性。一、編碼規(guī)則:消息代碼中的0傳輸碼中的0，消息代碼中的1傳輸碼中的+1、-1交替例如:消息代碼:1010100010111AMI碼:+10-10+1000-10+1-1+1二、AMI碼的特點(diǎn):1由AMI碼確定的基帶信號中正負(fù)脈沖交替，而0電位保持不變;所以由AMI碼確定的基帶信號無直流分量，且只有很小的低頻分量;2不易提取定時信號，由于它可能出現(xiàn)長的連0串。三、解碼規(guī)則從收到的符號序列中將所有的-1變換成+1后，就可以得到原消息代碼程序流程圖HDB3碼一、HighDensityBipolaroforder3code,三階高密度雙極性碼。HDB3的編碼規(guī)則1先將消息代碼變換成AMI碼，若AMI碼中連0的個數(shù)小于4,此時的AMI碼就是HDB3碼;2若AMI碼中連0的個數(shù)大于3,則將每4個連0小段的第4個0變換成與前一個非0符號(+1或-1)同極性的符號,用表示(+1+,-1-);3為了不破壞極性交替反轉(zhuǎn)，當(dāng)相鄰符號之間有偶數(shù)個非0符號時，再將該小段的第1個0變換成+B或-B,符號的極性與前一非零符號的相反，并讓后面的非零符號從符號開始再交替變化。例如:消息代碼:100001000011000011AMI碼:+10000-10000+1-10000+1-1HDB3碼：+1000+V-1000-V+1-1+B00+V-1+1流程圖：CMI碼CMI（CodedMarkInversion）碼是傳號反轉(zhuǎn)碼的簡稱，與雙相碼類似，它也是一種雙極性二電平碼。其編碼規(guī)則是“1”碼交替用“11”和“00”兩位碼表示；“0”運(yùn)行結(jié)果截圖輸入源代碼functionvarargout=gui02(varargin)gui_Singleton=1;gui_State=struct('gui_Name',mfilename,...'gui_Singleton',gui_Singleton,...'gui_OpeningFcn',@gui02_OpeningFcn,...'gui_OutputFcn',@gui02_OutputFcn,...'gui_LayoutFcn',[],...'gui_Callback',[]);ifnargin&&ischar(varargin{1})gui_State.gui_Callback=str2func(varargin{1});endifnargout[varargout{1:nargout}]=gui_mainfcn(gui_State,varargin{:});elsegui_mainfcn(gui_State,varargin{:});end%Endinitializationcode-DONOTEDIT%---Executesjustbeforegui02ismadevisible.functiongui02_OpeningFcn(hObject,eventdata,handles,varargin)%Thisfunctionhasnooutputargs,seeOutputFcn.%hObjecthandletofigure%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesstructurewithhandlesanduserdata(seeGUIDATA)%varargincommandlineargumentstogui02(seeVARARGIN)%Choosedefaultcommandlineoutputforgui02handles.output=hObject;%Updatehandlesstructureguidata(hObject,handles);%UIWAITmakesgui02waitforuserresponse(seeUIRESUME)%uiwait(handles.figure1);%---Outputsfromthisfunctionarereturnedtothecommandline.functionvarargout=gui02_OutputFcn(hObject,eventdata,handles)%varargoutcellarrayforreturningoutputargs(seeVARARGOUT);%hObjecthandletofigure%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesstructurewithhandlesanduserdata(seeGUIDATA)%Getdefaultcommandlineoutputfromhandlesstructurevarargout{1}=handles.output;functioninputcode_Callback(hObject,eventdata,handles)%hObjecthandletoinputcode(seeGCBO)%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesstructurewithhandlesanduserdata(seeGUIDATA)%Hints:get(hObject,'String')returnscontentsofinputcodeastext%str2double(get(hObject,'String'))returnscontentsofinputcodeasadouble%ò?×?·?′?μ?D?ê?à′′?′￠êy?Y??±??ò1μ??úèYinput=str2num(get(hObject,'String'));guidata(hObject,handles);%---Executesduringobjectcreation,aftersettingallproperties.functioninputcode_CreateFcn(hObject,eventdata,handles)%hObjecthandletoinputcode(seeGCBO)%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesempty-handlesnotcreateduntilafterallCreateFcnscalled%Hint:editcontrolsusuallyhaveawhitebackgroundonWindows.%SeeISPCandCOMPUTER.ifispc&&isequal(get(hObject,'BackgroundColor'),get(0,'defaultUicontrolBackgroundColor'))set(hObject,'BackgroundColor','white');end%---Executesonbuttonpressinamibutton.functionamibutton_Callback(hObject,eventdata,handles)%hObjecthandletoamibutton(seeGCBO)%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesstructurewithhandlesanduserdata(seeGUIDATA)xn=str2num(get(handles.inputcode,'String'));yn=xn;%AMI??num=0;fork=1:length(xn)ifxn(k)==1num=num+1;ifnum/2==fix(num/2)yn(k)=1;elseyn(k)=-1;endendendxnynfigure;subplot(2,1,1);stairs([0:length(xn)-1],xn);axis([0length(xn)-22]);title('PMC??')subplot(2,1,2);stairs([0:length(xn)-1],yn);axis([0length(xn)-22]);title('AMI??')%---Executesonbuttonpressinhdb3button2.functionhdb3button2_Callback(hObject,eventdata,handles)%hObjecthandletohdb3button2(seeGCBO)%eventdatareserved-tobedefinedinafutureversionofMATLAB%handlesstructurewithhandlesanduserdata(seeGUIDATA)xn=str2num(get(handles.inputcode,'String'));yn=xn;%AMI??num=0;fork=1:length(xn)ifxn(k)==1num=num+1;ifnum/2==fix(num/2)yn(k)=1;elseyn(k)=-1;endendendnum=0;%HDB3yh=yn;sign=1;V=zeros(1,length(yn));fork=1:length(yn)ifyn(k)==0num=num+1;ifnum==4v(1)=yh(k-4);breakendelsenum=0;endendfork=1:length(yn)ifyn(k)==0num=num+1;ifnum==4num=0;yh(k)=v(sign);v(sign+1)=-v(sign);ifyh(k)==yh(k-4)elseyh(k-3)=yh(k);yh(k+1:length(yn))=-1*yh(k+1:length(yn));endsign=sign+1;endelsenum=0;endendys=zeros(1,2*length(xn));xnyhfiguresubplot(2,1,1);stairs([0:length(xn)-1],xn);axis([0length(xn)-22]);title('PMC??')subplot(2,1,2);stairs([0:length(xn)-1],yh);axis([0length(xn)-22]);title('HDB3??')%---Executesonbuttonpressincimbutton3.functioncimbutton3_Callback(hObject,eventdata,handles)%hObject