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%低通抽样定理 clear all; close all; dt = 0.01; t = 0:dt:10-dt; xt = 0.1*cos(0.15*pi*t)+1.5*sin(2.5*pi*t)+0.5*cos(4*pi*t); [f,xf] = T2F(t,xt); %抽样信号，抽样速率为4Hz fs = 4; sdt = 1/fs; t1 = 0:sdt:10-d

n=[1:(2^13)]; x1=cos(n.*1e9*2*pi/4e9); X2=rm2; x2=X2'; x=x1.*X2; b=0.42+0.5*cos(2*pi*(n-(2^12))/(2^13))+0.08*... cos(4*pi*(n-(2^12))/(2^13)); X=b.*x; x3=[ones(1,64) zeros(1,8128)]; y1=X

function DEC_X=judge(y)%最大似然检测子函数，y1，y2为待检测信号，nt为，返回值为与待检测信号相隔最近的调制信号星座图中对应的信号值 DEC_X=zeros(1,4); for i=1:4 for i=1:4 d(i,m)=abs(y(i)-exp(j*2*pi/4*(m-0.5))).^2;%求调制信号星座图中各调制信号与待检测信号的距离

function DEC_X=judge(y)%最大似然检测子函数，y1，y2为待检测信号，nt为，返回值为与待检测信号相隔最近的调制信号星座图中对应的信号值 DEC_X=zeros(1,4); for i=1:4 for m=1:4 d(i,m)=abs(y(i)-exp(j*2*pi/4*(m-0.5))).^2;%求调制信号星座图中各调制信号与待检测信号的距离

function M=pin(Ap,dl); i=1; n=pi/dl(1); M(1)=n; while n

for n=1:10 x(n)=sin(n*pi/10); end x

ezplot('sin(3*t)*cos(t)','sin(3*t)*sin(t)',[0,pi])

x=linspace(0,2*pi,100); y=sin(x); z=cos(x); a=sin(x).*cos(x);b=sin(x)./(cos(x)+eps) subplot(2,2,1);plot(x,y),title('sin(x)') subplot(2,2,2);plot(x,z),title('cos(x)') subplot(2,2,3);plot(x

fplot('[tanh(x),sin(x),cos(x)]',2*pi*[-1 1 -1 1])

theta=linspace(0,2*pi), rho=sin(2*theta).*cos(2*theta); polar(theta,rho,'g') title('Polar plot of sin(2*theta).*cos(2*theta)');