untitled2.asv

uwb的信号产生以及几种调制方法

t=(0:0.1:1);
k1=5;
k2=6;
k3=2.8;
Tm=0.5e-9;
b1=0.7;
b2=0.001;
b3=0.15;
r(t)={k+4*k*exp(-b*t)/[k*x/2+(1-k)/2*k-b*t*x/4]};
[r1]=r(k1,Tm,b1);
[r2]=r(k2,Tm,b2);
[r3]=r(k3,Tm,b3);
time=linspace(-Tm/2,Tm/2,length(b1));
function [w0]= cp0201_waveform(fc,Tm,tau);
dt = 1 / fc;            % reference sampling period
OVER = floor(Tm/dt);    % number of samples representing
                        %  the pulse

e = mod(OVER,2);
kbk = floor(OVER/2);
tmp = linspace(dt,Tm/2,kbk);
s = (1-4.*pi.*((tmp./tau).^2)).* ...
     exp(-2.*pi.*((tmp./tau).^2));

if e                % OVER is odd
    for k=1:length(s)
        y(kbk+1)=1;
        y(kbk+1+k)=s(k);
        y(kbk+1-k)=s(k);
    end
else                % OVER is even
    for k=1:length(s)
        y(kbk+k)=s(k);
        y(kbk+1-k)=s(k);
    end
end

E = sum((y.^2).*dt);     % pulse energy
w0 = y ./ (E^0.5); 
  fc=5e10;
Tm=0.5e-9;
tau1=0.2333e-9;
[a1]=cp0201_waveform(fc,Tm,tau1);

time=linspace(-Tm/2,Tm/2,length(a1));
p=plot(time,a1);
conv(s,r);
p=plot(time,b1,time,b2,time,b3);