[Discuss-gnuradio] Any friends ever worked on noise variance estimation using the USRP?

Hi gurus,

I am doing an experiment which need to estimate the noise variance of each USRP as receiver.

My question is that besides the sample variance method, is there any other method to achieve better accuracy? 

And for a single USRP, is the variance stable after the power on? And is the measurement related to working frequency?

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Alex,

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