Re: [Discuss-gnuradio] Sample Rate in GHz

[Marcus Müller]

Hi Przemek,

the USRPs are all up/downconverting transmitters/receivers:
You digitally provide them with a complex baseband signal, which they convert to an analog I / Q signal, and use quadrature mixing with a synthesized LO to shift the signal in frequency domain to that LO's frequency (TX).
In RX direction, they take the RF bandpass signal, mix it with a synthesized LO to baseband and simultaneously sample the I and Q channels so that you get a digital complex baseband signal.

Hence, to generate a 6GHz sine, you'd just generate a constant value as complex baseband signal (sampling rate doesn't matter for constants!) and let the USRP mix it up to 6GHz.

Generally, the USRPs are direct-conversion transceivers as described, but can also physically be used as low-IF transceivers thanks to the DSP frequency shifting.

Best regards,
Marcus

On 14.09.2015 22:36, Przemek Lewandowski wrote:

Hello everyone

I didnt try it yet, but as I see Ettus B210 has got 61 MS/sec and 6 GHz upper frequency limit.

If I want to generate Sinusoid  for 6 GHz, I need a 12Giga Sample Rate (Nyquist theorem) ?!  Propably not, as I think.

Thank You 

Przemek Lewandowski

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