On 29/04/2011 2:05 PM, Pascal Matthieu wrote:
One thing to observe is that FM and FSK are essentially the same
thing, with FM having a "continuous" modulation input, and FSK
I would like to ask a few questions regarding USRP,
UHD and GNU Radio. I have 2 USRP devices and one module I
bought that's able transmitt and receive on 433.92 MHz. I
installed UHD on 2 computers (both with Win XP OS),
connected to each one a USRP1 that has a WBX daughterboard
and a Log Periodic type antenna by Kent Electronics that's
on Ettus order page. Both USRP's are recognized.
1. I would like to send some data packets that will have
FSK and GFSK modulation. With one USRP I will receive data
coming from the module and data coming from the second USRP.
Each packet will have some data in it to be identified, so
that I could log it. As I am a newbie I would like to ask if
there are any test examples for GRC or simply Python to
modify it to meet my requirements. Honestly I don't know
where to start. There are blocks for AM, FM, DPSK, GMSK, QAM
and others, each one heaving a MOD and DEMOD block but no
blocks for FSK.
a "discrete" (1s and 0s) input.
rors and data is not usable. Is it correct how I'm thinking the
problem or I should tink in a different way.
Use the source, Luke. All of the source code for Gnu Radio, UHD,
and the FPGA code is all there. If you want to build your own
3. My first steps will be to try some source code in
Python but after that I plan to make my own interface to
control these devices (the second USRP and the module). I
don't really know how to get the I/Q data from USRP, how to
set different parameters like center frequency and others.
There's any partial or full documentation related to this.
If I could use the Visual Studio I would be able to make
some GUI. If there's no souce code written for FSK maybe
based on other codes written for other modulation types, I
will make one, but ther's little chance for that to work,
anyway I will have to know how to get I/Q data from USRP,
how to write .rbf file to FPGA, and others.
to the hardware, all the information is there, in the form of the
source code, to do so. But I have to ask--why? Unless you have
very-stringent requirements, it doesn't sound like what you want
to do can't be accomplished with UHD+Gnu Radio. In terms of
intellectual exercises, I can think of others that would be more
productive than re-inventing Gnu Radio and UHD.