Hi all,
I have a problem here with
polyphase clock synchronization block when i set the output samples per
symbol to one the constellation have much more ISI and noise and when
output sps value is 2 the constellation have no noise and no ISI.I am using
the firdes.root_raised_cosine filter design in polyphase clock
synchronization block with the follwoing parameters
Polyphase clock synchronization block parameters
filter size =32
firdes.root_raised_cosine(nfilts,1.0,1.0/(nfilts*sps), rolloff, int(11*sps*nfilts)) with sps=2 nfilts=32 rolloff=0.7
My flow graph picture is attached with this mail.
please
tell me if there is any problem in my parameters (I m using QPSK using
the chunks to symbol block with const.points() function for mod and
constellation decoder block with const.base() function in the
constellation object parameter for demod)
If there are any errors in my flowgraph parameters please guaid me.
Regards,
Irfan Ullah
My_Flowgraph_pictutre.png
constellation_with_osps=1.png
constellation_with_osps=2.png