Re: [Discuss-gnuradio] clipping in usrp

[Marcus Müller]

Those are "digital values relative to the full amplitude of the ADC"; they are proportional to the voltage at the ADC, but since the USRP isn't calibrated, you can't directly convert them to voltages (since you don't know the factor between volts and digital value for any given frequency, gain, bandwidth combination).

Best regards,

Marcus

On 08.08.2016 21:31, Raja Muneeba wrote:

Ok, thanks.

Could you also tell what is the unit of amplitude(y-axis) in these plots? I mean what are these +1 to –1 values? I have searched a lot but couldn’t find the exact answer. They are just dat files of gnu radio imported in matlab and plotted.

Regards,

Muneeba R.

From: Marcus Müller <address@hidden>
Date: Monday 8 August 2016 22:08
To: Raja Muneeba <address@hidden>, "address@hidden" <address@hidden>
Subject: Re: clipping in usrp

Nothing wrong - the numeric range you should be getting is really -1 to +1, so this is expected. Reduce the gain.

Best regards,
Marcus

Am 8. August 2016 20:08:50 MESZ, schrieb Raja Muneeba <address@hidden>:

Hi,

I am facing an issue and I don’t know the reason of that. I transmit at 2.48Ghz with gain 32db at transmitter side. The signal I get at the receiver (as attached) gets clipped between amplitude +1 and –1. This signal is imported in matlab from gnu radio and plots are shown.

Could you guide a bit what is wrong here, where does this clipping happen?

Regards,

Muneeba R.

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