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Re: [Discuss-gnuradio] The noise power of the USRP

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] The noise power of the USRP
Date: Sun, 20 Dec 2015 22:45:55 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 12/20/2015 10:42 PM, w xd wrote:
Thanks so much.

If in a general indoor environment(no people),we just use a usrp as a receiver and in a quiet frequency band,have someone have the
general data?Can you give a non-official data?around -80dbm?or -70dbm?

            Or how to measure it?What is the true way to measure it?

Use a calibrated noise source. Take a spectrum measurement. Now take another measurement with your antenna plugged in.

If you know what the noise PSD is of the noise source, then based on the difference between noise source and antenna-plugged-in, you
  can calculate the ambient noise PSD.

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