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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 22:34:44 -0500
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On 12/20/2015 10:31 PM, w xd wrote:

    Thank you so much.

    I have looked at one sentence "the noise floor is around 90dBm" in a paper.So I want to know whether have some similar measure data about the noise floor in the general environment indoor not just the noise figure.

It very, very, much depends on the environment.

2015-12-21 11:22 GMT+08:00 Marcus D. Leech <address@hidden>:
On 12/20/2015 10:16 PM, w xd wrote:
Thanks so much.

"The true noise power" I mean if I don't send anything just use the usrp to receive.Because don't have signal in the environment,the receive thing using the usrp is the noise.I want to know the power of the noise.Thanks.Hope to explain explicit.

That's a very very different question.  Just because one side isn't sending anything, doesn't mean that your receiver sees *nothing*.
  There's RFI, and at higher frequencies, thermal noise from the environment, etc.  Hard to come up with a single number for that.

2015-12-21 11:04 GMT+08:00 Marcus D. Leech <address@hidden>:
On 12/20/2015 09:58 PM, w xd wrote:
     I want to know the true noise power(in dbm) of the usrp n210.And i'm using the sbx and lp0964 antenna.
     Do someone have the data?


Best Regards,
xs w

Noise figure depends on frequency and gain setting:


Performance data includes noise figure.

Not sure what you mean by "true noise power".  But noise figure tells you how much extra noise is added by the device itself.

A 3dB noise figure is equivalent to a PSD of -174dBm/Hz.
A 5dB noise figure is equivalent to a PSD of -172dBm/Hz.

And so on.

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