Re: Shifting frequency spectrum

Hi Snehashish,

it's not really clear what you did exactly. How did you do the
shifting? Did you already take the mixing (probably by 947.4 MHz) done
by your SDR freontend into account?
(Also, frequencies and bandwidths have units!)

Best regards,
Marcus

On Mon, 2019-11-11 at 14:55 +0000, Snehasish Kar wrote:
> Hello
>
> I tried capturing GSM 900 band at a sample rate of 25e6 centered at 947.4e6 and stored in a file. Then on the captured data I tried shifting 935.2e6 to the center and perform a low pass filter samples out followed by a re-sampler to get 200e3 samples out. But I think the spectrum shifting is not wroking as it should be I am following the following link for spectrum shifting https://dsp.stackexchange.com/a/1993. I am using twinrx with 10gig sfp, UHD_3.13.1.0-0-unknown, ubuntu 16.04 and liquid dsp for signal processing.
> fft - How to shift the frequency spectrum? - Signal Processing Stack Exchange
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> dsp.stackexchange.com
> Please let me know, where I might be going wrong.
>
> BR
> Snehasish
>