According to the document of USRP-2930 SPECIFICATIONS, we can see the following information in Figure 1 below. I want to know if this "Maximum I/Q sample rate" parameter refers to the upper limit of the “IQ rate” parameter of the baseband signal? For example, the “IQ rate” parameter in the “niUSRP Configure Signal.vi” (as indicated by the clipping in the figure 2).
In addition, the “niUSRP Write Tx Data (poly) VI” contains five specific instances as shown in Figure 3 below.
Except for the CDB and I16 types, the data interface in the instances does not see the 8bits data type interface?
Describe my project requirements again:
I want to transmit I and Q baseband waveforms to USRP through LabView on the host for transmission. So the instance I want to use is “niUSRP Write Tx Data(CDB)”. The question I'm facing now is what is the maximum sample rate (IQ rate) of the baseband waveform I'm able to set? by the way，the device I use is a 2930.
According to my previous understanding, I think:
For CDB (complex + double-precision floating-point type), my understanding is that the width of the real part and the imaginary part both are 64 bits, then the width of a CDB is 128 bits (that is, 16 bytes)
Because "Maximum I/Q sample rate" of USRP 2930 is 50MS/s under the condition of 8bits width
So for my situation, the maximum sampling rate(IQ rate) of baseband that can be supported is:
50MS/s÷16==3.125MS/s
This value is too small, it doesn't look very reasonable.
Please guide me where is my mistake?
I have another question about the CDB storage type, which can be found here.
Ask a question about CDB data type storage format - NI Community
