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DSP: translates between IF and baseband ah, no. These are baseband-sampling ("IQ") devices. The RF frontends (the "daughterboards" already convert to baseband. At stage 1, the daughter board (UBX-1 …

L1 is at 1.57 GHz, L5 at 1.18 GHz. The N310 only has a single RX LO for both RX channels, so you can't tune to both at the same time. The receiver bandwidth is also not large enough, so you can't tune …

How does USRP interpolate signals beyond 100M at a clock frequency of 100M? It's up to some frequency. The input interface works well with lower rates. So, the clock rate here is really 100 MHz. …

Can I connect the USRP to a real oscilloscope? Sure, but it'd need to be an oscilloscope whose bandwidth is larger than the highest frequency. It's not clear why you think you need to do this. … Just connect the transmitting USRP to the receiving USRP, and observe the frequency difference in baseband. …

These devices are not calibrated. There's not even a hint at a guarantee that they have the same output power for the same gain settings! So, this is expected; note that the absolute digital receive p …

You set the sample rate of the USRP such that it sufficiently high for your application. The Bandwidth field in the USRP blocks means the bandwidth of the analog front end. …

Did the USRP N210 "use" each transmission baseband samples 20 times when processing the baseband signal I emit? No, it correctly interpolates the samples twentyfold. …

Anyway, not the real problem, because your > 30 MHz bandwidth exists within the digital part of your USRP. All you need to do is convince the digital part, not the analog part! … In stock USRP FPGA images that's the case, but as these are open source, so you can modify them to your delight. For example, in RFNoC-supporting (X?? …

If you can see the chirp, attach the USRP Sink instead. Also add a USRP Source. Calculate the beat frequency with a "multiply conjugate". gr-radar implements FMCW and quite a few other radar methods. …

You're looking only at the real part. Obviously, if the phase of transmitter and receiver aren't locked (like here), that will mean the sent oscillation will be more or less in-phase.

So I would like to know how this transmitter channel gain process is implemented, Depends on the USRP (or if you're using a modular model, on the daughterboard), but speaking generally: A mixture of selectable …

The solution here is to calibrate; i.e. send a signal, measure it with a calibrated spectrum analyzer, measure the same signal with your USRP, and then calculate the factor between these two powers. …

Also make sure you're actually seeing the signal you think you're seeing: your USRP AND your LoRa transmitter might both have frequency offsets. But: 15 MHz difference at 915 MHz? … That would be an error of 1/61 ; the USRP has a frequency accuracy of ca 10 ppm (that's 1/100000), your LoRa transmitter maybe of 50 ppm. No way you're observing a 915 MHz signal at 930 MHz. …

I can't resample this signal using an interpolation plus filtering approach, as it should be computed in real time (I would need to interpolate the signals up to 480 MHz...). Fallacy! Using a rat …

It is important for the simulation that I'm running that there are only 4 possible modulation values before noise is added to the system. So, you made a mistake when building your simulation, or …