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

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD I/O Data Types
Date: Thu, 07 Apr 2011 00:47:24 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110223 Lightning/1.0b2 Thunderbird/3.1.8

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?


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