【吐血推荐】史上超强《深入浅出讲通信原理》5.doc

【深入浅出讲通信】201：什么是相位（二）1.jpg (30.62 KB)2010-11-20 23:122.jpg (31.1 KB)2010-11-20 23:12【深入浅出讲通信】202：如何计算相位1.jpg (54.27 KB)2010-11-21 23:20【深入浅出讲通信】203：如何计算相位（二）1.jpg (59.22 KB)2010-11-22 22:57【深入浅出讲通信】204：如何理解同相和反相1.jpg (45.29 KB)2010-12-6 20:382.jpg (45.17 KB)2010-12-6 20:38【深入浅出讲通信】205：同相和反相情况下的相位差1.jpg (40.24 KB)2010-12-7 22:27【深入浅出讲通信】206：如何理解负相位1.jpg (49.25 KB)2010-12-7 22:412.jpg (34.34 KB)2010-11-26 21:23【深入浅出讲通信】207：如何确定零相位点【深入浅出讲通信】208：如何确定初始相位1.jpg (56.37 KB)2010-11-29 23:162.jpg (53.27 KB)2010-11-29 23:16【深入浅出讲通信】209：如何确定初始相位（二）1.jpg (41.66 KB)2010-11-30 23:08【深入浅出讲通信】210：什么是相位差1.jpg (47.3 KB)2010-12-2 00:07 t=-0.025:0.001:0.025; y1=sin(2*pi*50*t); plot(t,y1, r); hold on; y2=sin(2*pi*50*t-2*pi/3); plot(t,y2, b); hold on; y3=sin(2*pi*50*t-4*pi/3); plot(t,y3, g);【深入浅出讲通信】211：什么是相移1.jpg (64.23 KB)2010-12-8 23:552.jpg (59.46 KB)2010-12-8 23:55【深入浅出讲通信】212：相位失真1.jpg (58.68 KB)2010-12-9 22:55【深入浅出讲通信】213：系统的相频特性【深入浅出讲通信】214：什么是正交1.jpg (34.26 KB)2010-12-11 22:472.jpg (24.1 KB)2010-12-11 22:473.jpg (20.45 KB)2010-12-11 22:474.jpg (24.97 KB)2010-12-11 22:47【深入浅出讲通信】215：相位超前和滞后（一）1.jpg (44.19 KB)2010-12-12 23:48【深入浅出讲通信】216：相位超前和滞后（二）1.jpg (34.45 KB)2010-12-14 00:102.jpg (32.04 KB)2010-12-14 00:103.jpg (35.16 KB)2010-12-14 00:10【深入浅出讲通信】217：什么是相干1.jpg (65.68 KB)2010-12-14 23:552.jpg (58.92 KB)2010-12-14 23:55【深入浅出讲通信】218：什么是相干解调【深入浅出讲通信】219：奈奎斯特第一准则（一）1.jpg (69.31 KB)2010-12-19 23:212.jpg (37.41 KB)2010-12-19 23:21【深入浅出讲通信】220：奈奎斯特第一准则（二）1.jpg (44.69 KB)2010-12-19 22:432.jpg (31.03 KB)2010-12-19 01:11 subplot(311); n=0:1:7; y=1,1,1,-1,1,-1,-1,1; stem(n,y) ; axis( -1 8 -1.5 1.5); subplot(312); axis( -1 8 -1.5 1.5); arrow(0,0,0,1); arrow(1,0,1,1); arrow(2,0,2,1); arrow(3,0,3,-1); arrow(4,0,4,1); arrow(5,0,5,-1); arrow(6,0,6,-1); arrow(7,0,7,1); line(-1 8,0 0); subplot(313); t=-1:0.001:8; y1=sinc(t); plot(t,y1);hold on; y2=sinc(t-1); plot(t,y2);hold on; y3=sinc(t-2); plot(t,y3);hold on; y4=-sinc(t-3); plot(t,y4);hold on; y5=sinc(t-4); plot(t,y5);hold on; y6=-sinc(t-5); plot(t,y6);hold on; y7=-sinc(t-6); plot(t,y7);hold on; y8=sinc(t-7); plot(t,y8);hold on; y= y1+y2+y3+y4+y5+y6+y7+y8; plot(t,y, r);hold on; n=0:1:7; y9=1,1,1,-1,1,-1,-1,1; stem(n,y9,r) ; axis( -1 8 -2.5 2.5);【深入浅出讲通信】221：奈奎斯特第一准则（三）1.jpg (79.43 KB)2010-12-20 00:292.jpg (33.09 KB)2010-12-20 00:29 f=-1.5:0.001:1.5; y1=rectpuls(f,1); plot(f,y1) hold on; f=-1:0.001:1; y2=0.5* (1+cos(pi*f); plot(f,y2,r) ; axis(-1.5 1.5 -0.5 1.5); grid on【深入浅出讲通信】222：奈奎斯特第一准则（四）1.jpg (59.44 KB)2010-12-21 00:012.jpg (52.88 KB)2010-12-21 00:01 t=-4:0.001:4; y1=sinc(t).*cos(pi*t)./(1-4.*t.*t); plot(t,y1, r); hold on; y2=sinc(t); plot(t,y2); axis(-4 4 -0.5 1.5); grid on 【深入浅出讲通信】223：升余弦滚降滤波器1.jpg (48.67 KB)2010-12-21 23:40【深入浅出讲通信】224：脉冲成型滤波器【深入浅出讲通信】225：BPSK调制的基带脉冲波形1.jpg (54.27 KB)2010-12-23 23:09 subplot(121); t=-4:0.001:4; y=sinc(t).*cos(pi*t)./(1-4.*t.*t); plot(t,y); axis(-4 4 -1.5 1.5); grid on; subplot(122); t=-4:0.001:4; y=-sinc(t).*cos(pi*t)./(1-4.*t.*t); plot(t,y); axis(-4 4 -1.5 1.5); grid on2.jpg (54.04 KB)2010-12-23 23:09 subplot(311); n=0:1:7; y=1,1,1,-1,1,-1,-1,1; stem(n,y) ; axis( -1 8 -1.5 1.5); subplot(312); axis( -1 8 -1.5 1.5); arrow(0,0,0,1); arrow(1,0,1,1); arrow(2,0,2,1); arrow(3,0,3,-1); arrow(4,0,4,1); arrow(5,0,5,-1); arrow(6,0,6,-1); arrow(7,0,7,1); line(-1 8,0 0); subplot(313); t=-1:0.001:8; x=t; y1= sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y1);hold on; x=t-1; y2= sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y2);hold on; x=t-2; y3= sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y3);hold on; x=t-3; y4=-sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y4);hold on; x=t-4; y5= sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y5);hold on; x=t-5; y6=- sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y6);hold on; x=t-6; y7=- sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y7);hold on; x=t-7; y8= sinc(x).*cos(pi*x)./(1-4.*x.*x); plot(t,y8);hold on; y= y1+y2+y3+y4+y5+y6+y7+y8; plot(t,y, r);hold on; n=0:1:7; y9=1,1,1,-1,1,-1,-1,1; stem(n,y9,r) ; axis( -1 8 -1.5 1.5);【深入浅出讲通信】226：BPSK基带脉冲波形的解调1.jpg (26.88 KB)2010-12-25 00:36【深入浅出讲通信】227：什么是眼图: 1.jpg (94.34 KB)2010-12-25 23:402.jpg (54.52 KB)2010-12-25 23:45【深入浅出讲通信】228：眼图的形成原理1.jpg (55.94 KB)2010-12-26 23:042.jpg (64.96 KB)2010-12-26 23:043.jpg (63.65 KB)2010-12-26 23:04【深入浅出讲通信】229：频带利用率概念辨析1.jpg (81.26 KB)2010-12-28 23:06【深入浅出讲通信】230：基带系统和频带系统1.jpg (54.79 KB)2010-12-30 07:06【深入浅出讲通信】231：频带带宽与基带带宽的关系1.jpg (61.55 KB)2011-1-1 19:022.jpg (26.79 KB)2010-12-30 23:24【深入浅出讲通信】232：双边带调制信号带宽与基带带宽的关系1.jpg (39.54 KB)2011-1-1 10:092.jpg (34.77 KB)2011-1-1 19:05【深入浅出讲通信】233：单边带调制信号带宽与基带带宽的关系1.jpg (38.3 KB)2011-1-2 07:11【深入浅出讲通信】234：IQ调制信号带宽与基带带宽的关系1.jpg (29.17 KB)2011-1-2 22:44【深入浅出讲通信】235：数字调制的频带利用率1.jpg (87.95 KB)2011-1-3 22:39【深入浅出讲通信】236：增加信道编码后的频带利用率1.jpg (61.53 KB)2011-1-4 23:36【深入浅出讲通信】237：BPSK调制的频带信号波形1.jpg (55.19 KB)2011-1-5 23:15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=-1:0.001:8; x=t; y1= sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1; y2= sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2; y3= sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3; y4=-sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4; y5= sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5; y6=- sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6; y7=- sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7; y8= sinc(x).*cos(pi*x)./(1-4.*x.*x); y= y1+y2+y3+y4+y5+y6+y7+y8; s=y.*cos(2*pi*10*t); plot(t,s);hold on; plot(t,y,r); 【深入浅出讲通信】238：QPSK调制的频带信号波形1.jpg (60.28 KB)2011-1-6 23:33%输入信号 subplot(4,1,1); t=0:0.001:8; d=0 0 ;0.5 1;1 1;1.5 0;2 1 ;2.5 1;3 0;3.5 0;4 1;4.5 0 ;5 1 ;5.5 1 ;6 0 ;6.5 1 ;7 0 ;7.5 0; s=pulstran(t-0.25,d,rectpuls,0.5);plot(t,s) ; axis(0 8 -0.5 1.5); text(0.25,1.2,0) ; text(0.75,1.2,1) ; text(1.25,1.2,1) ; text(1.75,1.2,0) ; text(2.25,1.2,1) ; text(2.75,1.2,1) ; text(3.25,1.2,0) ; text(3.75,1.2,0) ; text(4.25,1.2,1) ; text(4.75,1.2,0) ; text(5.25,1.2,1) ; text(5.75,1.2,1) ; text(6.25,1.2,0) ; text(6.75,1.2,1) ; text(7.25,1.2,0) ; text(7.75,1.2,0) ;% I路信号 subplot(4,1,2); t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y01= y1+y2+y3+y4+y5+y6+y7+y8; plot(t,y01); axis(0 8 -2 2); text(0.5,1.5,-0.7) ; text(1.5,1.5,+0.7) ;text(2.5,1.5,-0.7) ;text(3.5,1.5,+0.7); text(4.5,1.5,+0.7) ; text(5.5,1.5,-0.7) ;text(6.5,1.5,-0.7) ;text(7.5,1.5,+0.7);% Q路信号 subplot(4,1,3); t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y02= y1+y2+y3+y4+y5+y6+y7+y8; plot(t,y02); axis(0 8 -2 2); text(0.5,1.5,+0.7) ; text(1.5,1.5,-0.7) ; text(2.5,1.5,-0.7) ; text(3.5,1.5,+0.7) text(4.5,1.5,-0.7) ; text(5.5,1.5,-0.7) ; text(6.5,1.5,+0.7) ; text(7.5,1.5,+0.7)%QPSK调制信号 subplot(4,1,4); t=0:0.001:8; s1=y01.*cos(2*pi*10*t) ; s2=y02.*sin(2*pi*10*t); plot(t,s1-s2) ; axis(0 8 -2 2); text(0.3,1.5,3pi/4) ; text(1.3,1.5, 7pi/4) ; text(2.3,1.5,5pi/4) ; text(3.3,1.5,pi/4) ; text(4.3,1.5, 7pi/4) ; text(5.3,1.5, 5pi/4) ; text(6.3,1.5,3pi/4) ; text(7.3,1.5,pi/4) ; 【深入浅出讲通信】239：QPSK调制信号的包络1.jpg (61.97 KB)2011-1-7 23:07% I路信号 t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y01= y1+y2+y3+y4+y5+y6+y7+y8;% Q路信号 t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y02= y1+y2+y3+y4+y5+y6+y7+y8;%QPSK调制信号 t=0:0.001:8; s1=y01.*cos(2*pi*5*t) ; s2=y02.*sin(2*pi*5*t); plot(t,s1-s2) ; axis(0 8 -2 2); grid on; text(0.3,1.5,3pi/4) ; text(1.3,1.5, 7pi/4) ; text(2.3,1.5,5pi/4) ; text(3.3,1.5,pi/4) ; text(4.3,1.5, 7pi/4) ; text(5.3,1.5, 5pi/4) ; text(6.3,1.5,3pi/4) ; text(7.3,1.5,pi/4) ;%包络 y03=sqrt(power(y01,2)+power(y02,2); hold on; plot(t,y03, r:); hold on; plot(t,-y03, r:); 【深入浅出讲通信】240：利用旋转向量理解BBF+IQ调制1.jpg (25.65 KB)2011-1-8 22:502.jpg (52.42 KB)2011-1-8 22:50蓝色向量在实轴上的投影就是IQ调制后的信号。【深入浅出讲通信】241：旋转向量末端的三维立体轨迹图1.jpg (79.25 KB)2011-1-9 23:08% I路信号 t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y01= y1+y2+y3+y4+y5+y6+y7+y8;% Q路信号 t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); y02= y1+y2+y3+y4+y5+y6+y7+y8;%BBF+IQ调制信号 t=0:0.001:8; s1=y01+y02*i; s2=cos(2*pi*5*t) +sin(2*pi*5*t)*i; s=s1.*s2; plot3(real(s) ,t,imag(s) ; ylabel(t); zlabel(y); xlabel(x); set(gca,YDir,reverse); axis(-1.5 1.5 0 8 -1.5 1.5); grid on;2.jpg (53.05 KB)2011-1-9 23:08 clf; plot(t,real(s); axis(0 8 -1.5 1.5);3.jpg (52.08 KB)2011-1-9 23:08 clf; plot(t,imag(s); axis(0 8 -1.5 1.5);4.jpg (56.01 KB)2011-1-9 23:08 clf; plot(real(s),imag(s); axis(-1.5 1.5 -1.5 1.5);【深入浅出讲通信】242：包络的严格定义1.jpg (39.93 KB)2011-1-11 00:432.jpg (38.13 KB)2011-1-11 00:43包络曲面.jpg (60.86 KB)2011-1-12 01:181、曲面的轴线没法横过来（希望能和前面画的三维立体轨迹图保持一个方向）。2、目前delta的取值：delta=0.05，中间有缝隙：包络曲面2.jpg (63.96 KB)2011-1-12 01:28如果再取小就变成黑色了：delta=0.01包络曲面3.jpg (48.08 KB)2011-1-12 01:28% I路信号 delta=0.05; t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); I= y1+y2+y3+y4+y5+y6+y7+y8;% Q路信号 t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); Q= y1+y2+y3+y4+y5+y6+y7+y8;%包络曲面 r=sqrt(power(I,2)+power(Q,2);x,y,z= cylinder(r,50);surf(x,y,z)画圆柱体的matlab代码，供大家参考按理讲照这个代码照葫芦画瓢应该能画出所需的包络曲面，可是折腾了一晚上也没搞定。谁熟悉matlab帮忙搞一下，谢谢！圆柱体.jpg (51.47 KB)2011-1-12 01:35t=linspace(-pi,pi,25);y=linspace(-1,1,10);T,Y=meshgrid(t,y);X=cos(T);Z=sin(T);mesh(X,Y,Z);axis equal 【深入浅出讲通信】243：包络的严格定义（二）1.jpg (19.27 KB)2011-1-12 23:352.jpg (42.09 KB)2011-1-12 23:35% I路信号 delta=8/160; t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); I= y1+y2+y3+y4+y5+y6+y7+y8;% Q路信号 t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); Q= y1+y2+y3+y4+y5+y6+y7+y8;%包络曲面 =find(isnan(I);I(i)=0; =find(isnan(Q);Q(i)=0; I(81)=0.708;I(121)=-0.708; Q(41)=-0.708;Q(101)=-0.708;Q(141)=0.708; r=sqrt(power(I,2)+power(Q,2); u=linspace(-pi,pi,50); y=linspace(0,8,161); U,Y=meshgrid(u,y); U,R=meshgrid(u,r); X=R.*cos(U); Z=R.*sin(U); surf(X,Y,Z); axis equal ylabel(t); zlabel(y); xlabel(x); set(gca,YDir,reverse); axis(-1.5 1.5 0 8 -1.5 1.5); grid on;3.jpg (46.02 KB)2011-1-12 23:354.jpg (47.41 KB)2011-1-12 23:35【深入浅出讲通信】244：IQ信号的三维立体轨迹图1.jpg (27.42 KB)2011-1-13 23:302.jpg (55.26 KB)2011-1-13 23:30% I路信号 delta=8/160; t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); I= y1+y2+y3+y4+y5+y6+y7+y8;% Q路信号 t=0:delta:8; a=1/sqrt(2); x=t-0.5; y1= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-6.5; y7= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-7.5; y8= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); Q= y1+y2+y3+y4+y5+y6+y7+y8;%包络曲面 =find(isnan(I);I(i)=0; =find(isnan(Q);Q(i)=0; I(81)=0.708;I(121)=-0.708; Q(41)=-0.708;Q(101)=-0.708;Q(141)=0.708; r=sqrt(power(I,2)+power(Q,2); u=linspace(-pi,pi,50); y=linspace(0,8,161); U,Y=meshgrid(u,y); U,R=meshgrid(u,r); X=R.*cos(U); Z=R.*sin(U); surf(X,Y,Z); axis equal ylabel(t); zlabel(y); xlabel(x); set(gca,YDir,reverse); axis(-1.5 1.5 0 8 -1.5 1.5); grid on; shading interp% I路信号 t=0:0.001:8; a=1/sqrt(2); x=t-0.5; y1= -a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-1.5; y2= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-2.5; y3= - a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-3.5; y4= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-4.5; y5= a.*sinc(x).*cos(pi*x)./(1-4.*x.*x); x=t-5.5; y6= -a.*sinc(x