thanks Thomas! i didn't state it clearly .i want to realize a MIMO system ,so I use two channels .and my daughterboards are RFX2400 MIMO B . and another problem appears。in the receiver ,since the two channels receive the same signal simultaneously，i thought the two received signals from the two channels should be more or less the same(though they may go through different shading).but through the graph i find the signal from channel two seems 1/4 λ ahead of that from channel one<br><br>在2010-05-31 23:43:54，"Thomas Tsou" <tt...@vt.edu> 写道： >2010/5/31 weizhongshan <weizhongsha...@163.com>: >> hello every ! >> i use one usrp to transmit complex gr_sin_wave,and use another two_channel >> usrp as the receiver. >> i thought the mux should be set to "32103210",but when i did this ,i got >> nothing but noisy .then i changed the mux to "33221100",i got the ecpected >> orthogonal sin and cos wave .that confuses me > >What is your daughterboard setup and why are you using 2 channels? >With 2 channels, the default "32103210" value uses all four ADC's and >the first 2 DDC's. It sounds like you only want to read one channel >and output separated I and Q components. > > Thomas
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