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JANVIER, Thibault, 12/15/2015 10:34 AM
1. Definition of inputs and ways to compute the outputs - Theory¶
1. Display of the power spectrum
Figure 9: Computation of the Power Spectrum
Once we have our signal coming from the USRP, we have to compute the expected results. To observe the spectrum of the signal we just need to put the power spectrum block of LabView with the good parameters. This allows us to compute the power of the signal and the power of the noise.
Now, let’s have a look to digital results. We want to observe the constellation of the signal and some results like mean error vector magnitude or mean phase error. Our signal analyser does not determine automatically what is the constellation used to transmit the signal, we have to know it before and to enter it in the program as a parameter. Then we can observe the received constellation, the mean error vector magnitude, the mean phase error, and the mean magnitude error. 
Figure 1: Measures explanation scheme