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" <m...@ettus.com> 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 > >Yes. > >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. > >Matt
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