noise.m

该程序仿真超宽带的脉冲位置调制。是在MATLAB下实现的。

Tf=100; %[ns]
R=19.2e3; %[bps]
Ns=1/R/(Tf*1e-9);
delta=0.156; %[ns]
noise_var=-60; %[dBm/Hz]
noise_var=10^(noise_var/10-3); %[W/Hz]
A1=1;

W=4e9; %Hz    

if W==inf
    A=1;
    [t,w]=scholtz(A, 0);
    [t,wd]=scholtz(A, delta);
    dt=(t(2)-t(1))*1e-9; %[s]
    Tf=Tf*1e-9; %[s]
    v=w-wd;
    drec2=noise_var*Ns*sum(v.*v)*dt;
else
    % 10 MHz << W  << 500GHz
    temp=0;
    for t=0.5:0.01:2
        for s=0.5:0.01:2
            Rn=2*W*sinc(2*W*(t-s)*1e-9);
            temp=temp+Rn*vbit(t,delta,Tf)*vbit(s,delta,Tf);
        end
    end
    drec2=noise_var*Ns*temp*(.01e-9)^2;
end

[mp, da2, Mtilda]=dirma(Tf, delta);
m=A1*Ns*mp;

Sout1=10*log10(m^2/drec2) %[dB]