Hi Snehasish, That's surprising, I didn't think it was possible to do that. How did you re-create the EDIF file?
The noc_shell and axi_wrapper modules have both changed internally quite a bit, but their interfaces have only minor changes. The noc_shell interface change is simply adding the set_time, set_hase_time output signals. Those outputs can be left unconnected. The axi_wrapper interface now has a bus_clk and bus_rst input. To complicate things, the code uses a modified axi_wrapper called axi_wrapper_mod. You could compare the latest axi_wrapper with axi_wrapper_mod and merge in the differences. Jonathon On Tue, Apr 28, 2020 at 5:37 PM Snehasish Kar <snehasish....@live.com> wrote: > Snehasish Kar has shared a OneDrive file with you. To view it, click the > link below. > <https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP> > fract_dec_filter.edf <https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP> > <https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP> > > Hello > > > 25msps and tried dividing it into 16 channels. I should have returned > 625kspsx2 sample rate each channel > > >Based on your screen shot I'm guessing you started with 10 Msps and used > 16 channels to get 625 kHz channel spacing (with 1250 ksps per channel). Is > that correct? > > Yes. > > But you can see the snaphshots, if a tune into 955.4MHz and try to get a > channel on index 0 ie the center freq, it works well and I am able to > decode GSM Burst from it. But if I try to add index 2(which is 955.8MHz), > the amplitude in the spectrum falls and also I am not able to decode any > GSM burst > > >Is it correct that your "index 2" center frequency is targetting 400 kHz > offset from the center frequency? If so, I dont expect this would work. > Using a channel spacing of 625 kHz, the >closest channel you could receive > next to 955.4 MHz would be 956.025 MHz. Based on your screenshot it > actually seems like the peak energy you're looking for may be lower than > the >channel frequency by about 200 kHz? > > No. The reason we found for the low energy was that the center of the > channel was getting shifted by 100KHz, which we corrected using the > frequency Xlating fir filter in gnuradio and also by changing the input > sample rate. > > @EJ Kreinar <ejkrei...@gmail.com>: thanks for the support. > > @Jonathon Pendlum <jonathon.pend...@ettus.com>: I was able to re-create > the EDIF file for the fractional downsampler in > https://github.com/SynchronousLabs/rfnoc-SynchronousLabs and was able to > build it. Though I believe I need to update the rfnoc API for the same. I > have the attached EDIF file for your reference. Please guide me if only > modifying the noc file work or we any other changes are to be made as per > the new rfnoc version. > > Regards > Snehasish > > >
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