I don't think the RRC filter is used for carrier frequency correction. In gnuradio, the FLL filter can be used for CFO correction. Please correct me if I am wrong.
On Wed, May 29, 2013 at 9:43 PM, yeran <[email protected]> wrote: > Hi everyone,**** > > > I’m doing channel estimation in gnu radio narrowband. But the result is > different than I expect.**** > > > I’m using the example in grc, uhd_tx_dpsk.grc and uhd_rx_dpsk.grc. Send > vector (255,255,255) repeatedly using BPSK. At the receiver, I add a file > sink after the time_recov block and store the data.**** > > > Y=X*H +N, the data after time_recov is Y, and in BPSK, when sending 1 is > mapped to 1+0j, so X=1+0j. Thus, Y/X is the estimate channel frequency I > get. I plot the absolute value of the channel frequency and get a figure as > in the attachment. But it seems that it has the carrier frequency with it. > It is so well organized and changes regularly. But I’m pretty sure that > before the file sink, in the time_recov block, the rrc filter already take > off the carrier frequency.**** > > > Has anyone come across the same problem before? Or find any mistakes or > suggestions on my method? Please let me know!**** > > > Thank you very much!**** > > Ada > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- Alex, *Dreams can come true – just believe.*
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