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Re: [Discuss-gnuradio] Info regarding replacing USB with Infiniband Opti

From: Rohit Gupta
Subject: Re: [Discuss-gnuradio] Info regarding replacing USB with Infiniband Optical Fiber
Date: Tue, 6 Mar 2007 11:36:45 -0800

Hi Martin,

The document that describes MIMO configuration below suggests how 64MHz clocks of two boards are synchronized. However, for coherent MIMO processing, the LO, which for 802.11b band is arnd 2.4GHz has to be synchronized. How does that happen??


On 2/25/07, Martin Dvh <address@hidden> wrote:
Martin Dvh wrote:
> Rohit Gupta wrote:
>>We are working on using GNURadio for using it as RF node capable of
>>2*2/4*4 MIMO. All the RF nodes are connected to very big FPGA like the
>>one used in "Berkeley Emulation Engine (BEE)" using "Infiniband"
>>Optical Fiber. All the signal processing is implemented in "BEE"
>>hardware. We wanted to replace USB with Infiniband so that we can send
>>raw ADC/DAC samples to/from BEE processing engine. It would be very
>>helpful if some body could give us pointers on how to do this so that
>>we can reuse most of the design of GNUradio board.
>>Also, I have come across some people using two GNURadio boards for 4*4
>>MIMO. Is there a document which describes how to synchronize the LOs
>>of two GNURadio boards for coherent MIMO processing and program two
>>GNURadio boards for 4*4 MIMO??
I just put the desciption of how to do MIMO (MultiUSRP) in the wiki.



> Read this document, it should explain it:
> gnuradio-examples/python/multi_usrp/README
> (online available as
> http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-examples/python/multi_usrp/README
> )
> Also read:
> http://gnuradio.org/trac/wiki/USRPClockingNotes
> Make sure you understand the hardware requirements, have the right cables, and set the usrp clock input and output accordingly.
> I wrote the code to enable this and have experience in using it.
> I you have any questions or problems getting it to work feel free to ask.
> Greetings,
> Martin
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