Tom Rondeau wrote: > On 3/3/2010 7:12 AM, Mattias Kjellsson wrote: > >> amarnath alapati wrote: >> >> >>> hi everyone, >>> >>> I am using the programs of DIGITAL-BERT folder to see the bit >>> error rate pattern versus the SNR. The given programs are for BPSK >>> scheme. I tried to change it for QPSK Scheme. But seems that I did not >>> do it right. I am giving the modified code in the programs . Please >>> help me out......Thanking in advance.... >>> >>> >> I think that the Costas- and MM- blocks only work for differential >> encoding... If anyone knows differently, speak now of forever hold your >> peace ;p >> >> //Mattias >> >> > > > No, the synchronization schemes are not dependent on the type of > encoding. They will work for either differential or non-differential. In > fact, they are really overkill for differentially encoded modulations.... > > Tom > > Hum... I'm glad to hear that, although I thought that the pi- phase ambiguity of Costas- loops made them unsuitable for QPSK- constellations... But I guess there is something I'm missing in the code then?
Come to think of it. As stated in "Practical Costas loop design, J Feigin", one can track the carrier, but there is a chance that the carrier will come out of the loop "upside down". Are there blocks that check for this? BR //Mattias _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
