Re: [Discuss-gnuradio] Agile Solutions is Pleased to announce USRPSTAR. Yet another addition to GNURADIO

[info]

On Wed, 20 Apr 2011 17:12:34 -0500 (CDT), "Jeff Brower"
<address@hidden> wrote:
>> On 04/19/2011 01:10 PM, address@hidden wrote:
>>>
>>> Dear Matt,
>>>
>>> We honestly went through every material in search on Google but we
>>> couldn't locate a single article published successful testing for
>>> STBC/SFBC.
>>>
>>> For whatever reason, we would like to know, if you can confirm on this
>>> with your lab setup ?
>>> We have done considerable experimental work on this. And we are certain
>>> with the results we have have found.
>>> We would encourage this exploration in best interest of all from your
>>> end.
>>>
>>> Thank you.
>>>
>>
>> Dear Mr. Solutions,
> 
> Mr. Solutions = Akash Kosgi, Lakshmamma Layout, Banaswadi, Bangalore,
> 560043, India.
> 
> -Jeff
> 
>>
>> All USRP systems can do STBC, SFBC, spatial multiplexing, etc.  I've
>> said it multiple times and pointed you to multiple sources.  Steve
>> Peters told you he and the Hydra team at UT have done it.  I have seen
>> it done.  I have done it myself.  Our customers have been doing it for 6
>> years now.  The WARP boards from Rice do it in the exact same way.
>> Millions of WiFi systems do it the same way.
>>
>> Page 4, section 4 of the following paper says the same thing:
>>
>> http://newport.eecs.uci.edu/~hyousefi/publ/lamacGC09.pdf
>>
>> "Our experiments rely on a MANET testbed in
>> which each test node consists of a host PC and a USRP
>> motherboard hosting a pair of frontend RF daughter boards.
>> Since each daughter board is attached to a single antenna,
>> each MANET node is equipped with a pair of antennas. When
>> transmitting, each MANET node utilizes Space-Time Block
>> Coding (STBC) method of [23]. "
>>
>>
>> I don't know what more I could possibly say.  No matter how many times
>> you ask the question, the answer will always be the same.  Just because
>> *you* couldn't get it to work doesn't mean it's impossible.
>>
>> Matt Ettus


Dear Mr. Research,
 
This sounds odd if you meant it to be 2x2 Alamouti scheme.

"When transmitting, each MANET node utilizes Space-Time Block Coding
(STBC) method of [23]." 
"When receiving, it utilizes Maximum Ratio Combining (MRC)."


STBC and MRC are two different methods. If such an article is
published, then it is to reviewed to its contents with right experts.
A simple signal processing math would be sufficient to understand
Space/Time/Frequency diversities.

Akash Kosgi