Re: [Discuss-gnuradio] UHD I/O Data Types

[Josh Blum]

On 04/06/2011 08:42 PM, Arya Santini wrote:
> Hello..
> 
> The I/O types defined in the uhd::io_type_t class lists 4 COMPLEX
> types and a CUSTOM type. What I/O type should I specify in the call to
> send()/recv() if my baseband signal is real and not complex, say I'm
> transmitting from a file containing real samples of float type. How is
> a sample type of real float or real short interpreted and/or converted
> by the UHD library to shorts over the wire?
> 

I think this is a misunderstanding. A complex baseband signal represents
1/fs bandwidth of spectral content which the USRP will modulate to the
center frequency -> fc.

To have a "real" signal is to leave half of your spectrum undefined. Is
it symmetric about fc? or is it really a complex signal centered at fc+fs/4?

-Josh