Sampling Rate

GNU Radio
1

Hi,
I’m getting confused with the concept of “Sampling rate” to set the
UHD:USRP Source and other blocks from the gnuradio-companion. If I’m
still right, the sampling rate must be at least the double of the
operating frequency. But I can see some working applications when this
Nyquist theory is not respected. How come?

2

On 2/17/12 2:07 AM, guelord ingala wrote:

Hi,
I’m getting confused with the concept of “Sampling rate” to set the
UHD:USRP Source and other blocks from the gnuradio-companion. If I’m
still right, the sampling rate must be at least the double of the
operating frequency. But I can see some working applications when this
Nyquist theory is not respected. How come?

GnuRadio uses complex (I & Q) samples. This results in twice the data
per sample, satisfying the Nyquest criterion.

@(^.^)@ Ed

3

In the same way that GNU Radio uses complex samples, USRPs also deliver
complex baseband samples; thus, 25 MSPs of complex baseband gives you 25
MHz of bandwidth.

Cheers,
Ben

On Fri, Feb 17, 2012 at 7:30 AM, Ed Criscuolo