Thank you very much Luca. I understood it very well.
On Thu, Sep 8, 2016 at 2:16 AM, Luca Pascale wrote:
> Hi Samith,
> I suppose as noise source you can use something like
> http://www.noisecom.com/products/components/nc520-low-
> voltage-surface-mount-noise-source-200-khz-to-5-ghz
> or similar
Well, since the phases are everything that contains any direction
information, I sure hope they are not "approximately equal" for every
point somewhere in the room, otherwise you couldn't do MUSIC or any
other DOA estimator!
On 09/07/2016 12:37 PM, Samith Abeywickrama wrote:
> Thank you Marcus. I
Thank you Marcus. If I have a point source somewhere in the room, the
channel gains (both magnitudes and phases) from the point source to 4
antennas should be approximately equal. Otherwise, we are not correcting
actual phase differences of two USRP B210s. Isn't it?
On Wed, Sep 7, 2016 at 6:21 PM
Both, wired and separate transmitter, are viable solutions. If you use
wired, you'd have to calibrate your cabling first, though, then
calibrate the cabling used when attaching antennas against that. So, in
the general case, you're probably better off if you just have a "point
source" somewhere in
Hi Luca,
Thank you very much for your in detail explanation and it was really
helpful for me. The question now I have is, how can I feed calibration
signal? Is it a separate transmitter or some kind of wired link to usrp rx
inputs? Thank you.
Samith
On Sep 7, 2016 5:11 PM, "Luca Pascale" wrote:
Hi Samith,
to calibrate phase offset you can use a "calibration signal".
Using a (phase) balanced power divider you can feed the 4 rf input with
this calibration signal and use it to estimate differential phasors
between the 4 channels taking one of them as reference (i.e. the first).
You will hav
