When tuning, the WBX/SBX/UBX LO synthesizers always reconstruct the same
phase for a given frequency. With the WBX, that only works with the
discussed +- ambiguity.
So, this only happens when you re-tune. Estimate whether you're off by
180° after every tune. Calibrate the remaining inter-channel p
You're right: this isn't a show stopper, and in the context of this not
running in real time for my purposes anyway, I don't think it's a big deal.
In the interest of completeness, when is this ambiguity introduced? On
power up, or on some/any UHD call? Basically, when should I be aware
and c
on the N210: SBX.
UBX on the N210 does have that ambiguity (it doesn't on X3x0).
re MIMO: well, ambiguities aren't nice, but as a matter of fact, any
communication receiver needs to have a timing / phase recovery, be it a
MIMO receiver or not; typically, you'd try both options (remember, 180°
is j
As little comms knowledge as I have, I have even less about MIMO.
However, I'm having a hard time understanding how the WBX boards would
even be considered for any MIMO application when there could be a random
180 degree phase offset. Is there another daughtercard in which this
little quirk is
On 02/24/2016 12:24 AM, Justyn wrote:
Forgive me because I'm a software engineer with little theoretical
comms experience, but I'm having a difficult time understanding what a
180 phase shift at RF would mean for my baseband signal. If anything.
A phase shift at RF comes out as a phase-shift at
Forgive me because I'm a software engineer with little theoretical comms
experience, but I'm having a difficult time understanding what a 180
phase shift at RF would mean for my baseband signal. If anything.
Now the issue is that with GRC, there's no way to use timed-commands
directly, so you
On 02/23/2016 11:34 PM, Justyn wrote:
Makes sense.
If I can ask a follow up here:
1) If I instead use 2 USRPs connected via an external reference clock
and an Ethernet switch for receiving data, will they be
phase-aligned? If I understand what's going on in the context of the
ref clock, I t
On 02/23/2016 11:22 PM, Justyn wrote:
Hello,
I'm experimenting with the MIMO capabilities of the N210s with WBX
daughter cards and seeing how far I can get before I need the MIMO
breakout cable or GPSDO.
One of the first things I'd like to see is if both receivers on the
WBX daughter card c
