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Re:Re: [Discuss-gnuradio] usrp mimo question

From: weizhongshan
Subject: Re:Re: [Discuss-gnuradio] usrp mimo question
Date: Thu, 3 Jun 2010 09:28:34 +0800 (CST)

thanks matt<br/>so 2 usrps and 4 rfx dbs is enough for me ,and in usrp 
multi-signals can be simultaneous.while when i send a 50K frequency signal ,and 
receive it from two antennas ,through oscope i find the two IQ signals are not  
synchronous,signal from the second antenna seems 1/4 wavelength ahead of that 
from the first one .  do i have to modify the rfx2400 ? and another question , 
when i set the mux to "32103210" ,both channel get nothing but noise ,and set 
to "33221100",get the asynchronous signals mentioned above .why? i think it 
should be "32103210".<br/>   really appreciate your help<br/>   
wei<br><br>在2010-06-03 00:42:52,"Matt Ettus" <address@hidden> 写道:
>On 06/01/2010 03:18 AM, weizhongshan wrote:
>> sos!
>> i want to realize a 2*2 mimo simplex communication system .since rfx
>> daughterboards can transmit/receive 2 complex IO signals, i thought 2
>> usrp and 4 rfx_daughterboards is enough for me .but now i am wonfering
>> whether usrp can transmit/receive multiple signals simultaneously.could
>> somebody give a clue
>> wei
>You can make a 2x2 MIMO node (meaning 2TX and 2RX) using a single USRP1 
>with 2 RFX-series, WBX, or XCVR2450 daughterboards.  You then need 
>another set for the other side of the link.

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