Xlating filter will introduce phase shift

GNU Radio
1

I use xlating filter to down convert signal. after I down convert signal
it
I decode it.
however the data decoded is still the signal in 0 frequency before down
convert.
I check the xlating filter code it will change the signal phase to avoid
aliasing, yeah
it avoid aliasing but it is not the data I want how can I recover the
data’s
phase after
xlating filter?

Regards!

2

On Fri, Aug 12, 2011 at 3:50 AM, Page J. [email protected]
wrote:

Regards!
Those filters are implemented as FIRs, which means they will have
linear phase in the passband and constant (and known) group delay.

In general, though, you will never know the phase of the incoming
signal received over the air. If you have a signal where you require
the phase, you’ll have to figure out a way to recover it, anyways.

Tom

3

Hi Tom,
the xlating filter work fine, the phase shift is cause by another
factor.
Thanks for your
reply.