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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] USRP and XCVR2450 Noise Figure |
Date: | Thu, 15 Jul 2010 10:39:30 -0700 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4 |
On 07/15/2010 10:20 AM, Patrick Yeon wrote:
Not quite. Noise figure is a measure of the degradation of SNR, so if you know your input SNR, you would know that the measurements from the USRP will have a 35 dB worse (lower) SNR. Alternativley, you know your input SNR is 35 dB better (higher) than what you measure "coming out of" the USRP.
> > -- > Patrick Yeon > ThinkRF > 613-369-5104 x418No, that's not how it works either. The SNR is only degraded by an amount equal to the noise figure if the input signal has a noise floor of the thermal minimum (i.e. straight from an antenna). For anything coming through a device with gain or noise would not fit that criteria.
Matt
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