Re: [Discuss-gnuradio] About USRP's Bandwidth

[Ed Criscuolo]

On 11/8/11 9:29 AM, 弓长张 wrote:
> I'm a starter in using the USRP, it's known that the bandwidth of USRP 
> is 8M beacause of the USB bandwidth ,my question is the 8M refers to the 
> Nquist Bandwith or the actual signal bandwidth?If it refers to the 
> Nquist Bandwith, it is mean that USRP can only process the signal with 
> 4M bandwidth,so if a signal larger than 4M, how can USRP deals with it ?

Because the USRP does complex samples, an 8 megasample/sec rate
is enough to resolve up to 8 MHz.  This is in contrast  to magnitude-only
real samples, where an 8 megasample/sec rate would only resolve up to
4 MHz.

A qualitative way to think about it is that complex samples provide
twice the data as magnitude-only real samples, providing that
"factor of 2".

Nyquist will not be cheated!

@(^.^)@  Ed