Now that I understand how the basic Tx and usrp_siggen works,
I am trying to get a handle on the basic Rx and the usrp_fft.py script.
Here are a couple of observations/questions:
1) If nothing is connected to the basic Rx I get a strong DC term
on the fft display. Where is this coming from? Also
On Tue, Apr 19, 2005 at 04:59:19PM -0400, Achilleas Anastasopoulos wrote:
> All,
>
> thanks for the feedback.
> I submit a revised version of the block diagram for your comments.
>
> I understand that the Tx part at the output of the FPGA
> is a valid (hopefully) functional block diagram but it i
All,
thanks for the feedback.
I submit a revised version of the block diagram for your comments.
I understand that the Tx part at the output of the FPGA
is a valid (hopefully) functional block diagram but it is
not how it is really implemented on the DAC chip.
Achilleas
usrp.eps
Description: Post
On Tue, Apr 19, 2005 at 03:25:00PM -0400, Anastasopoulos Achilleas wrote:
>
> Let me make sure I understand this:
>
> What exactly is happening in the FPGA on the Tx side?
> My guess is that there a CIC interpolator that takes
> the USB complex samples and interpolates them to a
> complex stream
Let me make sure I understand this:
What exactly is happening in the FPGA on the Tx side?
My guess is that there a CIC interpolator that takes
the USB complex samples and interpolates them to a
complex stream with 32Msps, ie, 64Msps (real).
Is this accurate?
Now assuming that {z_k} represents t
Is this comment relevant for the Tx only
or for both TX and Rx ?
> Just one minor correction from what I said before. The way you show the
> multipliers and the NCO is not quite correct. It is doing a full
> complex
> multiplication. The CORDIC does the NCO and the multiplication
> together.
>
Cascaded Integrator Comb filters are pretty simple filters that are very
fast to compute
but produce those slow roll offs. There are more complex things that
could be done and
hopefully now that the USRP is really flowing out the door,
daughtercards and all, and
as we come up to speed, we can wo
A url to what the high dollar
commercial SDR is up to.
http://tinyurl.com/9o4rw
Kimsey Pollard
Microelectronic Research Center
Georgia Institute of Technology
404-894-4207___
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