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首页 深入浅出通信原理五251-300

深入浅出通信原理五251-300.docx

深入浅出通信原理五251-300

妙音天女
2018-09-11 0人阅读 举报 0 0 0 暂无简介

简介:本文档为《深入浅出通信原理五251-300docx》,可适用于工程科技领域

连载:什么是相位(二)连载:如何计算相位连载:如何计算相位(二)连载:如何理解同相和反相连载:同相和反相情况下的相位差连载:如何理解负相位连载:如何确定零相位点连载:如何确定初始相位连载:如何确定初始相位(二)连载:什么是相位差连载:什么是相移连载:相位失真连载:系统的相频特性连载:什么是正交连载:相位超前和滞后(一)连载:相位超前和滞后(二)连载:什么是相干连载:什么是相干解调连载:奈奎斯特第一准则(一)连载:奈奎斯特第一准则(二)连载:奈奎斯特第一准则(三)连载:奈奎斯特第一准则(四)连载:升余弦滚降滤波器连载:脉冲成型滤波器连载:BPSK调制的基带脉冲波形连载:BPSK基带脉冲波形的解调连载:什么是眼图连载:眼图的形成原理连载:频带利用率概念辨析连载:基带系统和频带系统连载:频带带宽与基带带宽的关系连载:双边带调制信号带宽与基带带宽的关系连载:单边带调制信号带宽与基带带宽的关系连载:IQ调制信号带宽与基带带宽的关系连载:数字调制的频带利用率连载:增加信道编码后的频带利用率连载:BPSK调制的频带信号波形连载:QPSK调制的频带信号波形连载:QPSK调制信号的包络连载:利用旋转向量理解BBFIQ调制连载:旋转向量末端的三维立体轨迹图连载:包络的严格定义连载:包络的严格定义(二)连载:IQ信号的三维立体轨迹图连载:IQ信号在复平面上的投影轨迹连载:通过IQ平面上信号轨迹分析包络的变化连载:IQ信号轨迹和星座图的关系连载:相邻码元相同情况下的IQ信号轨迹连载:QPSK调制的相位转移图连载:为什么要研究信号的包络?分享升余弦滚降滤波器冲击响应的公式推导fromZTE连载:什么是相位(二)jpg(KB):jpg(KB):连载:如何计算相位jpg(KB):连载:如何计算相位(二)连载:如何理解同相和反相jpg(KB):连载:同相和反相情况下的相位差jpg(KB):jpg(KB):连载:如何理解负相位jpg(KB):jpg(KB):连载:如何确定零相位点连载:如何确定初始相位jpg(KB):连载:如何确定初始相位(二)jpg(KB):连载:什么是相位差jpg(KB):>>t=::>>y=sin(*pi**t)>>plot(t,y,'r')>>holdon>>y=sin(*pi**t*pi)>>plot(t,y,'b')>>holdon>>y=sin(*pi**t*pi)>>plot(t,y,'g')连载:什么是相移jpg(KB):连载:相位失真jpg(KB):连载:系统的相频特性连载:什么是正交jpg(KB):jpg(KB):jpg(KB):jpg(KB):附连载链接:利用旋转向量理解正交调制连载:相位超前和滞后(一)jpg(KB):jpg(KB):连载:相位超前和滞后(二)jpg(KB):jpg(KB):连载:什么是相干jpg(KB):jpg(KB):附两个链接:http:wwwngsirnetfirmscomchinesehtmInterferencehtmhttp:wwwngsirnetfirmscomchinesehtmInterferencehtm连载:什么是相干解调连载:奈奎斯特第一准则(一)jpg(KB):连载:奈奎斯特第一准则(二)jpg(KB):jpg(KB):>>subplot()>>n=::>>y=,,,,,,,>>stem(n,y)>>axis()>>subplot()>>axis()>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>line(,)>>subplot()>>t=::>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=sinc(t)>>plot(t,y)holdon>>y=yyyyyyyy>>plot(t,y,'r')holdon>>n=::>>y=,,,,,,,>>stem(n,y,'r')>>axis()arrowm和arrowdm请到这里去下载:连载:复指数信号的傅立叶变换连载:奈奎斯特第一准则(三)jpg(KB):jpg(KB):>>f=::>>y=rectpuls(f,)>>plot(f,y)>>holdon>>f=::>>y=*(cos(pi*f))>>plot(f,y,'r')>>axis()>>gridon连载:奈奎斯特第一准则(四)jpg(KB):jpg(KB):>>t=::>>y=sinc(t)*cos(pi*t)(*t*t)>>plot(t,y,'r')>>holdon>>y=sinc(t)>>plot(t,y)>>axis()>>gridon连载:升余弦滚降滤波器jpg(KB):连载:脉冲成型滤波器连载:BPSK调制的基带脉冲波形jpg(KB):>>subplot()>>t=::>>y=sinc(t)*cos(pi*t)(*t*t)>>plot(t,y)>>axis()>>gridon>>subplot()>>t=::>>y=sinc(t)*cos(pi*t)(*t*t)>>plot(t,y)>>axis()>>gridonjpg(KB):>>subplot()>>n=::>>y=,,,,,,,>>stem(n,y)>>axis()>>subplot()>>axis()>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>arrow(,,,)>>line(,)>>subplot()>>t=::>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>plot(t,y)holdon>>y=yyyyyyyy>>plot(t,y,'r')holdon>>n=::>>y=,,,,,,,>>stem(n,y,'r')>>axis()连载:BPSK基带脉冲波形的解调jpg(KB):连载:什么是眼图:jpg(KB):连载:眼图的形成原理jpg(KB):jpg(KB):jpg(KB):连载:频带利用率概念辨析jpg(KB):连载:基带系统和频带系统连载:频带带宽与基带带宽的关系jpg(KB):连载:双边带调制信号带宽与基带带宽的关系jpg(KB):连载:单边带调制信号带宽与基带带宽的关系jpg(KB):连载:IQ调制信号带宽与基带带宽的关系jpg(KB):连载:数字调制的频带利用率jpg(KB):连载:增加信道编码后的频带利用率jpg(KB):连载:BPSK调制的频带信号波形jpg(KB):注:其中红色曲线为基带脉冲波形蓝色曲线为频带信号波形。>>t=::>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyy>>s=y*cos(*pi**t)>>plot(t,s)holdon>>plot(t,y,'r')连载:QPSK调制的频带信号波形jpg(KB):输入信号>>subplot(,,)>>t=::>>d=>>s=pulstran(t,d,'rectpuls',)plot(t,s)>>axis()>>text(,,'')text(,,'')text(,,'')text(,,'')>>text(,,'')text(,,'')text(,,'')text(,,'')>>text(,,'')text(,,'')text(,,'')text(,,'')>>text(,,'')text(,,'')text(,,'')text(,,'')I路信号>>subplot(,,)>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyy>>plot(t,y)>>axis()>>text(,,'')text(,,'')text(,,'')text(,,'')>>text(,,'')text(,,'')text(,,'')text(,,'')Q路信号>>subplot(,,)>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyy>>plot(t,y)>>axis()>>text(,,'')text(,,'')text(,,'')text(,,'')>>text(,,'')text(,,'')text(,,'')text(,,'')QPSK调制信号>>subplot(,,)>>t=::>>s=y*cos(*pi**t)>>s=y*sin(*pi**t)>>plot(t,ss)>>axis()>>text(,,'pi')text(,,'pi')text(,,'pi')text(,,'pi')>>text(,,'pi')text(,,'pi')text(,,'pi')text(,,'pi')连载:QPSK调制信号的包络jpg(KB):I路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQ路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQPSK调制信号>>t=::>>s=y*cos(*pi**t)>>s=y*sin(*pi**t)>>plot(t,ss)>>axis()>>gridon>>text(,,'pi')text(,,'pi')text(,,'pi')text(,,'pi')>>text(,,'pi')text(,,'pi')text(,,'pi')text(,,'pi')包络>>y=sqrt(power(y,)power(y,))>>holdon>>plot(t,y,'r:')>>holdon>>plot(t,y,'r:')连载:利用旋转向量理解BBFIQ调制jpg(KB):jpg(KB):蓝色向量在实轴上的投影就是IQ调制后的信号。连载:旋转向量末端的三维立体轨迹图jpg(KB):I路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQ路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyBBFIQ调制信号>>t=::>>s=yy*i>>s=cos(*pi**t)sin(*pi**t)*i>>s=s*s>>plot(real(s),t,imag(s))>>ylabel('t')>>zlabel('y')>>xlabel('x')>>set(gca,'YDir','reverse')>>axis()>>gridonjpg(KB):>>clf>>plot(t,real(s))>>axis()jpg(KB):>>clf>>plot(t,imag(s))>>axis()jpg(KB):>>clf>>plot(real(s),imag(s))>>axis()连载:包络的严格定义jpg(KB):连载:包络的严格定义(二)jpg(KB):jpg(KB):I路信号>>delta=>>t=:delta:>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>I=yyyyyyyyQ路信号>>t=:delta:>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>Q=yyyyyyyy包络曲面>>=find(isnan(I))I(i)=>>=find(isnan(Q))Q(i)=>>I()=I()=>>Q()=Q()=Q()=>>r=sqrt(power(I,)power(Q,))>>u=linspace(pi,pi,)>>y=linspace(,,)>>U,Y=meshgrid(u,y)>>U,R=meshgrid(u,r)>>X=R*cos(U)>>Z=R*sin(U)>>surf(X,Y,Z)>>axisequal>>ylabel('t')>>zlabel('y')>>xlabel('x')>>set(gca,'YDir','reverse')>>axis()>>gridonjpg(KB):连载:IQ信号的三维立体轨迹图jpg(KB):jpg(KB):I路信号>>delta=>>t=:delta:>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>I=yyyyyyyyQ路信号>>t=:delta:>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>Q=yyyyyyyy包络曲面>>=find(isnan(I))I(i)=>>=find(isnan(Q))Q(i)=>>I()=I()=>>Q()=Q()=Q()=>>r=sqrt(power(I,)power(Q,))>>u=linspace(pi,pi,)>>y=linspace(,,)>>U,Y=meshgrid(u,y)>>U,R=meshgrid(u,r)>>X=R*cos(U)>>Z=R*sin(U)>>surf(X,Y,Z)>>axisequal>>ylabel('t')>>zlabel('y')>>xlabel('x')>>set(gca,'YDir','reverse')>>axis()>>gridon>>shadinginterpI路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQ路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyIQ信号>>t=::>>s=yy*j>>holdon>>plot(real(s),t,imag(s))连载:IQ信号在复平面上的投影轨迹jpg(KB):I路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQ路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyIQ信号>>t=::>>s=yy*j>>holdon>>plot(real(s),imag(s))连载:通过IQ平面上信号轨迹分析包络的变化jpg(KB):jpg(KB):连载:IQ信号轨迹和星座图的关系jpg(KB):jpg(KB):连载:相邻码元相同情况下的IQ信号轨迹jpg(KB):jpg(KB):I路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyQ路信号>>t=::>>a=sqrt()>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>x=t>>y=a*sinc(x)*cos(pi*x)(*x*x)>>y=yyyyyyyyIQ信号>>t=::>>s=yy*j>>holdon>>plot(real(s),imag(s))连载:QPSK调制的相位转移图jpg(KB):连载:为什么要研究信号的包络?分享升余弦滚降滤波器冲击响应的公式推导fromZTE

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