GNU Radio and labview

Question

I am using a set of 4 N210 devices with SBX daughter boards where I need to perform a beamforming application. As I understood, the mentioned resync feature in the fractional PLL used is accessed through the UHD driver

Do Gnuradio or Labview support "resync feature"?

score 1 · Answer 1 · answered Apr 30 '16 at 21:29

1

Both use UHD, and both have access to the functionality necessary to synchronize the LO frontends in all four SBXes:

First, you will need to sync the N210's reference clocks – for that, you will need an external clock divider (e.g. an Octoclock) or GPSDOs.
Then, you set a common device time relative to a common PPS signal. That can also come from four GPSDOs, or be sourced from a single device and split with a clock divider (Octoclock etc)
Then, you can use timed commands to tune the frontends of the SBXes at exactly the same time, leading to a constant relative phase

For more information, the UHD manual's page on LO synchronization will be of help!

Notice that you should use a recent version of UHD, i.e. keep your software as fresh as possible.

answered Apr 30 '16 at 21:29

Marcus Müller

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thank u alot , and what about matlab , does matlab support this function also? – sara ragheb Apr 30 '16 at 23:57
All programs that talk to USRPs use the UHD driver. So yes, matlab's SDR toolkit has pretty extensive support for this too, but you should verify with the Mathworks. – Marcus Müller May 01 '16 at 07:41
I want to remove phase offest what should i do – sara ragheb May 02 '16 at 20:53
The usual. Measure that offset, and multiply with a complex constant to get rid of it. – Marcus Müller May 03 '16 at 07:45

GNU Radio and labview

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