Re: [Discuss-gnuradio] USRP data rates

[Richard Clarke]

Actually I believe 16MHz is only achieved by reducing the sample bit 
depth from 16 to 8, which I've read somewhere can be done.

8 Mega complex samples per second -> 8MHz when the real and imaginary 
parts of the complex sample are each 16 bits wide. (=32Mbytes/sec)
16 Mega complex samples per second -> 16MHz when I/Q are reduced to 8 
bits each (=32Mbytes/sec)

Somebody correct me if I'm wrong but I'm pretty sure that's right.

Cheers
Richard


Lisa Creer wrote:
> The USRP sales brochure lists as a feature "Capable of processing 
> signals up to 16 MHz wide". I can only figure out how it can process 
> signals up to 8 MHz wide. What am I missing?
>
> Since samples sent across the USB are 16-bit signed integers (16-bit I 
> and 16-bit Q for complex samples) that makes each complex sample size 
> 4 bytes. Since the USB max is 32MB/s, we have a limit of 8MS/s which 
> translates to an effective bandwidth of 8MHz wide.
>
> I noticed that there is another method besides usrp.source_c() to 
> retrieve data from the USRP, it is usrp.source_s(). Is this returning  
> an even smaller sample that would somehow get us to the 16 MHz wide 
> bandwidth? What exactly is this method returning?
>
> Thanks in advance.
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