Hi Sylvain,
> > You can see the spectrogram at the receiver. I want to do narrowband(1 > kHz) > > transmission hence I am keeping the sampling freq at transmitter at 1k. > > That sentence is just wrong. It's actually quite the opposite. > > By keeping the sample rate at the transmitter at 1k, you're basically > leaving all the alias filtering to the hardware and it's just not that > good. > What is alias filtering ? I have hear about anti-alias filters. Apologies as I am a CS student but interested in radios and hence working on the project. I might be missing something obvious. > You would be much better off oversampling the TX by like 10 and then > do digital filtering to make sure you filter out anything in the > higher freq. > > You mean at 400k center freq, I have a sample_rate of 400k X 10 = 4M ? Isn't this going to increase my transmisson BW ? Sure, I can do that with low pass filter at the receiver, but I don't want a massive frequency spectrum signature on the channel itself. My priority/requirement is to keep my transmission detectability in the spectrum as low as possible. Looking for your comments, Abhinav > > Cheers, > > Sylvain > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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