I'm doing some signal acquisition work with AD9361 and Z7C035 devoloment board.
I know AD9361 has double RX channels, when I tried to capture sinusoidal signal and observe the time domain image using signal RX channel, I found that there are lots of fluctuations in the signal, which look like the effect of noise. But if I plotted the time domain image with only the first 32 bits (one IQ pair) per 64bits, the signal would be smoother and more like a standard sinusoidal signal than before.
So my question is that if I capture the signal using single RX channel mode, the form of sampling data transmission is [I1,Q1,I1,Q1,I1,Q1,I1,Q1......] or [I1,Q1,I2,Q2,I1,Q1,I2,Q2......](In my condition I2 and Q2 may be noise) ?
That's very important for my future work.
Thank you so much for any advice!
For 1TX1RX, the IQ samples follow the following pattern(TX1 channel used):
I1, Q1, I1, Q1
For 2TX2RX configuration, the IQ samples follow the following pattern:
I1, Q1, I2, Q2, I1, Q1, I2, Q2
For 2R1T, the transmit IQ samples follows the following pattern(TX1 channel used):
I1, Q1, X, X,I1, Q1, X, X
Refer to the digital interface specification section in UG for better understanding.
Thanks for your reply so much!
It helps me a lot!