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
addr0=<first-device-ip-addr,addr1=<second-device-ip-addr>
In the device arguments.
Also, recent gr-uhd (3.7.6.1 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:
http://files.ettus.com/manual/page_devices.htmlhttp://files.ettus.com/manual/page_devices.html
The Doxygen docs are here:
http://files.ettus.com/manual/page_coding.html
The documents for gr-uhd are part of the Gnu Radio documentation:
http://gnuradio.org/doc/doxygen/classgr_1_1uhd_1_1usrp__source.html
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