GMSK Mod takes in packed bytes, Demod outputs unpacked bytes (e.g. 1 bit per byte). You may need to perform a conversion. Best way to figure out is to post a screenshot of your flowgraph.
On Fri, Jul 4, 2014 at 6:18 PM, Sun Wenbin <sun.wen...@outlook.com> wrote: > Good day everyone, > > My sincere apology in advance if this question has been asked before, but i > tried search thru the archives but to no avail. > > > Currently, I am trying to calculate the BER for GMSK, But first I started > off on a perfect channel without USRP. > > > My current block diagram is as follows: > > "Random Source" > 0s and 1s, 10^6 windows -> "Throttle" -> "GMSK Mod (default settings)" -> > "GMSK Demod (default settings)" -> "Error Rate Block" > > I am feeding in "Error Rate block" with the random source and the "GMSK > Demod" Output. > > I am getting BER of 50%... Anyone knows what is wrong? > > In fact, I saved the input and output as binary files. I found out that they > are not very identical especially in terms of binary length. I tried input 9 > bits of binary and I obtained 63 bits from the GMSK Demod Output. > > Is there something that is missing? > > Hope someone can advise me. Thank you :) > > Best Regards, > Sun > > _______________________________________________ > 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