[Discuss-gnuradio] UHD Announcement - July 6th 2010

[Josh Blum]

Hello all,

MIMO capabilities have just been added to the UHD. With N gigE ports and 
N USRP2s, one can perform synchronous aligned receives.

A usrp_mimo class has been added to the UHD for construction of a mimo 
enabled device configuration. And I have added the corresponding 
gnuradio blocks: uhd_mimo_source and uhd_mimo_sink that call into this 
interface. 
http://www.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1mimo__usrp.html

See the usrp2 application notes on device parameters for the 
configuration: 
http://www.ettus.com/uhd_docs/manual/html/usrp2.html#addressing-the-device

I should note that the aligned send for the mimo sink gnuradio block is 
not yet fully working, but may be used to test out the interface.

To use the new blocks you will need the most recent UHD master, 
gnuradio/jblum.git uhd branch, and SD card images. See links below:

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I have just pushed new host code to the uhd repo, posted new images, and 
pushed new uhd gnuradio blocks. The gnuradio blocks will be hosted on my 
jblum.git uhd branch until they are merged into the gnuradio.git next 
branch.

http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki

http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries#UHD-Firmware-and-FPGA-Images

http://gnuradio.org/cgit/jblum.git/log/?h=uhd

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For those of you calling directly into the UHD c++ API and not through 
gnuradio. I have changed the send and recv calls to reflect the mimo 
work. The asio buffer was replaced with two parameters: a vector of 
void-star pointers and a length in number of samples per buffer, for 
both send and recv. A convenience wrapper was added to pass in a single 
pointer and number of samples for the non-mimo case. The original 
interface with asio buffers is still there, just deprecated.

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Feedback is always welcome!

Thank you,
-Josh