Converting a signal to baseband after resampling
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Hello,
After resampling a passband signal, how can I convert it back to the baseband domain? In particular, I have the following code in MATLAB:
v=d.*exp(1i*2*pi*fc.*t);
z=resample(v,p,q);
where d and t are the signal and time vector respectively,and fc is the carrier frequency. In this case z after resampling has a different length than v, and hence I cannot write:
zBP=z.*exp(-1i*2*pi*fc.*t);
How can I handle this then?
Thanks
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Antworten (1)
Rick Rosson
am 3 Jun. 2014
Nz = length(z);
Nv = length(v);
r = Nz/Nv;
dt_old = t(2) - t(1);
dt_new = dt_old/r;
t_old = t;
t_new = dt_new*(0:Nv-1);
zBP=z.*exp(-1i*2*pi*fc.*t_new);
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