Good morning, I sampled a local DAB radio station at 225.648 MHz, decimation factor 32 with the USRP/tvrx.
DAB is using COFDM with pi/4-DPSK on 1536 subcarriers (see www.etsi.com, standard EN300401 for details). I wrote some Matlab code to demodulate the signal. The data is resampled from 2 MHz (URSP) to 2.048 MHz (DAB Standard). A frequency offset is compensated manually. It works so far, only one problem arises: The I/Q signal diagram jumps and jitters randomly by up to pi/8. What could be the problem? I am absolutely clueless - the frequency offset is compensated perfectly. My ultimate goal is to implement OFDM de/modulation and a DAB receiver in gnuradio. Greetings, Jens _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
