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Re: [Discuss-gnuradio] phase coherence for N210 and SBX

From: Pengyu Zhang
Subject: Re: [Discuss-gnuradio] phase coherence for N210 and SBX
Date: Fri, 24 Apr 2015 16:27:25 -0400

Hi Marcus,

I updated the flow graph (attached) as you suggested. It would be great if you can help check and let me know if I am wrong...

For upgrading the UHD, I followed this link. UHD is installed successfully. However, it seems that gnuradio does not call the latest UHD. Instead, it still calls uhd-host which is combined in the gnuradio package. Do you have suggestions about how to solve this problem? Thanks.


On Thu, Apr 23, 2015 at 6:28 PM, Marcus D. Leech <address@hidden> wrote:
On 04/23/2015 06:23 PM, Pengyu Zhang wrote:
Thanks for the inspiring tips. I did not use the WX GUI scope for checking the phase offset. Instead, I log the baseband signal received by each RX antenna. Then, I plot the IQ constellation of the received baseband for checking their phase offset.

Can you be a bit more specific when you say the "multi_usrp object" and the "timed commands"? Are there tutorials that I can follow step by step for using the two functions you mentioned? Your comments are very helpful :)

A source/sink block in Gnu Radio uses an underlying multi_usrp object, so all you have to do is configure your source block for two channels, with
  two devices, and use


In the device arguments.

Also, recent gr-uhd ( and newer at least) use timed commands, so phase-zeroing will happen after a tune automatically, without you having
  to do anything.

The top of the UHD manual is here:


The Doxygen docs are here:


The documents for gr-uhd are part of the Gnu Radio documentation:


Attachment: mimo_signal.grc
Description: Binary data

Attachment: top_block.py
Description: Text Data

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