Re: [Discuss-gnuradio] USRP2 UHD Matlab Receiver Communications Blockset

[Josh Blum]

On 09/09/2010 06:43 PM, Vincent W wrote:
> Hi,
>
> I stumbled on this blockset on the Matlab website:
>
> http://www.mathworks.com/help/toolbox/commblks/ref/usrp2receiver.html
>
> I've been making do with the old firmware and fpga, but when I saw this link, I
> became really excited - especially because it implies I can decrease the
> decimation on my USRP2 to 1 - perhaps by requesting real, single precision
> values instead of complex doubles.

The minimum sustainable sample rate over the wire is 25Msps for the UHD 
(unless you change FPGA implementation). I dont know what FPGA code 
"they" are using. Also, I dont think these simulink blocks have UHD 
under the hood.

> Is there an open source version of that blockset?
>
> Alternatively, despite poking around the UHD API, it wasn't immediately obvious
> how I could change the type of data, or set a decimation of 1, from the
> uhd::usrp::simple_usrp class. I suspect it may have something to do with the
> uhd::io_type_t class, but, again, I'm not too sure.

The device::send and device::recv calls take the IO type as an argument. 
The samples are converted between IO type and over-the-wire type in the 
UHD implementation code.

-Josh

> Has anyone had a chance to play around with this blockset, or know how it works?
> It looks _really_ neat, and appears to work with wbx boards.
>
> Vincent W
>
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