This is a fairly general question I feel like.
So, the scenario I am presenting is this:
I am generating random data using the random source module and feeding that data into the Constellation Modulator, thus producing a Basebase modulated signal. This takes us to my first question, why is the signal from (-f to +f) and not just (0 to +f)? Attached is a picture.
Next question is this, if I implement a low pass filter from (0 to f) f being a frequency relatively close to 0 Hz, why do I not see the rejection following with the roll off? Also, why is the negative frequency component still there?
I am teaching myself quite a bit of dsp and gnuradio, so any constructive feedback would be great!
If you look at the picture that actually has some decent pulse shaping, it seems to me that the cutoff frequency is far to high as well, but it's only at this range that I get decent pulse shaping.