On Mon, Jun 10, 2013 at 7:25 PM, vamshi krishna dodla <vamshikrishna.do...@gmail.com> wrote: > http://gnuradio.squarespace.com/storage/tutorial/rondeau-costterra2.pdf > > > Hi all, why does the output of PSK Mod block is imperfect, compared to > theoritical QPSK constellation.( iam implementing qpsk with 4 sampl/sym and > 4 constellation points).The experiment im doing is the same in link > (http://gnuradio.squarespace.com/storage/tutorial/rondeau-costterra2.pdf). > > > -- > Thanks & Regards > Vamshi Krishna.
Inter-symbol interference. Look up the root raised cosine filter and you'll see why. Basically, an RRC is /not/ a Nyquist filter. Now think about what that means to the receiver. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
