On 07/23/2012 03:08 AM, Luong Tan Phong wrote: > Hi Lists, > > I wrote a program in C + + use gnuradio library to demodulate some signals. > The > program works well with the low data rate signal (below 20 > Ksymbols/s). With higher > data rate signal: 200 Ksymbols/s, the program works well for a few minutes > then the console window will appear the letters 'O' continuously and data > after demodulation was wrong. With 1 Msymbols/s signal, the system can > operate well over 1 minute. > > Could you help me to solve the problem, please? >
It sounds like you found the tripping point where the rate of data flowing into the buffers exceeds the rate of data being removed. http://files.ettus.com/uhd_docs/manual/html/general.html#overflow-underflow-notes I admit, that is a rather low rate. Perhaps you have a filter with an unexpectedly large number of taps? Or you max consider benchmarking the performance of your demodulator code, or try to isolate which processing block is slow, etc -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
