I/Q Data Question

[Firehawk78]

Is the data showing changes in magnitude (or amplitude) and phase of received signals available using a bladeRF? If so, what is the best way to access it?

Thanks,
Brian

[Firehawk78]

jynik,

Thank-you very much for that VERY detailed reply! I agree, it was a very open-ended question. Your response has answered my question and given me much more information to consider!

Thanks again!
Brian

[sophiekovalevsky]

Hello everyone!

There is something that I do not still understand about the IQ samples coming off from the bladeRF. I am taking measurements with the device but I have seen in this thread and in other sources that, most of the time, what you get are normalized samples. However, this measurements are not telling you how much power you are getting, this is why:

If we have the ADC with a 12 bit resolution. We will obtain values between [-2048, 2047] this is okey. But, what is the equivalent in terms of voltage of these values? What I mean by that is that I need to have what are the voltage values that the bladeRF is receiving. This can be done if I know what is the reference voltage that the ADC is using to create the steps. I took a time to analyze the datasheet of the LMS but I am not able to find out what reference votlage they are using.

How this can be approached?

[txjacob]

Hello everyone!

There is something that I do not still understand about the IQ samples coming off from the bladeRF. I am taking measurements with the device but I have seen in this thread and in other sources that, most of the time, what you get are normalized samples. However, this measurements are not telling you how much power you are getting, this is why:

If we have the ADC with a 12 bit resolution. We will obtain values between [-2048, 2047] this is okey. But, what is the equivalent in terms of voltage of these values? What I mean by that is that I need to have what are the voltage values that the bladeRF is receiving. This can be done if I know what is the reference voltage that the ADC is using to create the steps. I took a time to analyze the datasheet of the LMS but I am not able to find out what reference votlage they are using.

How this can be approached?

I looked at the schematic for the BladeRF and it looks like they're running it at 3.3 V for the receiver size. So it looks like 0.8 mV per bit.