Hey, I only have my phone available right now so I can’t really check but from what I can see, you got a little problem with your decimation factors.
Your initial sps (samples per symbol) is 4 and you reduce it to 2 sps in the clock recovery process (output sps = 2). However, in you equalizer you set sps again to 4 whereas it should be 2. Hope this helps. Cheers, Julian Julian Arnold, M.Sc > On 7. Aug 2018, at 23:08, 梁帆 <[email protected]> wrote: > > Hello All, > > I am using the Gnuradio for two weeks. I am doing the Gnuradio tutorial 7 on > stage 5. There I used PSK demod to demodulate the signal. I do not know why > the output signals are different than input signal. This is the screenshot of > my blocks. Is that because my vector source influence the result or should I > use the My_Qpsk_demod block on tutorial 4. > > Thanks > Fan > <Screenshot from 2018-08-07 15-06-50.png> > <Screenshot from 2018-08-07 15-07-01.png> > <Screenshot from 2018-08-07 15-07-07.png> > <Screenshot from 2018-08-07 15-07-17.png> > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
