I tuned the usrp to 947.4MHz with sample rate of 25msps. And then using the example in the link I tried shifting the frequency to the centre, so that I can apply a low pass filter and perform resampling on it.
BR Snehasish Sent from my iPad > On 11-Nov-2019, at 10:02 PM, Müller, Marcus (CEL) <[email protected]> wrote: > > 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 >> Stack Exchange network consists of 175 Q&A communities including Stack >> Overflow, the largest, most trusted online community for developers to >> learn, share their knowledge, and build their careers.. Visit Stack Exchange >> dsp.stackexchange.com >> Please let me know, where I might be going wrong. >> >> BR >> Snehasish >>
