Hi,
I am new to GNU Radio but have noticed something… When I create a PSK
modulated signal and output that to a constellation sink, why is the
signal so noisy? Why is the signal not in four perfect constellation
points?
Signal Source -> PSK Mod -> Constellation Sink
Thanks,
Luke
On Thu, Aug 21, 2014 at 11:11 AM, PEEL Luke
[email protected]
wrote:
Signal Source → PSK Mod → Constellation Sink
Thanks,
Luke
That’s ISI (inter-symbol interference) due to the transmit pulse shaping
filter. The last of our new tutorials (still in beta) covers these
issues:
http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorial_PSK_Demodulation
Tom