If I am sampling at Fs, then the observable b/w is Fs/2

in uhd_fft , when I set sampling freq to X MSPS, I see the b/w is also X MHz wide.

What is the catch here ?

Ans : The catch here is complex sampling . The line which you mentioned above is true for real sampling , but for complex sampling you can observe a b/w of Fs when you are sampling at a rate of Fs.

Got it !!! :)

in uhd_fft , when I set sampling freq to X MSPS, I see the b/w is also X MHz wide.

What is the catch here ?

Ans : The catch here is complex sampling . The line which you mentioned above is true for real sampling , but for complex sampling you can observe a b/w of Fs when you are sampling at a rate of Fs.

Got it !!! :)

for even more clarity : the signal from antenna is phase shifted by 90 degree and we create I & Q streams -- Phase shift results in delay of signals -- so sampling the I and Q streams by X MSPS each -- resulting in 2X MSPs --- b/w of XMHz :-)

ReplyDelete