There is a coarse and a fine frequency offset correction. The fine correct makes sure that the subcarrier is centered in the bin; the coarse adjusts for an integer number of subcarriers off from the center frequency. By default, the OFDM receiver will correct for some number of subcarrier bins (it's either +/-5 or +/-10; I can't remember). If your radios have a frequency offset that is greater than the maximum number of subcarriers specified here, the receiver cannot receive the symbols correctly.
How about the fine frequency offset correction? How can I turn it on? For instance, how do I have to modify the benchmark/tunnel scripts in order to do that?
Yes, you can transmit a tone using uhd_siggen.py to fine out a rough estimate of the frequency offset and adjust either the transmitter or receiver based on this number.
Thanks, I will try that next days. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
