Hi Eric,
as a difference I spot that you use two samples per symbol for your 8- PSK, but only one for your BPSK flow graph. I assume that's intentional, but could you compare the 2 Sps case, too? What's the pulse shape your transmitter uses, by the way? Best regards, Marcus On Sat, 2018-10-13 at 15:11 +0800, eric.zeng wrote: > Hi, My Friends: > Recently, I follow the application article " Guided Tutorial PSK > Demodulation", and can make my QPSK/8PSK Tx/Rx demo with AD9361 > successfully. > Please see blow pic: > > > But when I use the same architecture flow chart for BPSK > demodulation, I found the Costas-loop can't lock correctly. > Please see below pic: > It looks like: > Maybe the CMA Equalizer do not work correctly under BPSK, so it cause > the Costas-loop can't lock. > When I disable the CMA Equalizer and connect the Poly-phase Sync to > Costas-loop directly, the Costas-loop can lock, I can get good BPSK > constellation. > As we know the CMA Equalizer is a right choice for MPSK demod, so is > there any thing wrong with my BPSK demodulation flow chart? > Thanks very much! > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
