[USRP-users] Regarding noise power calculation using SBX board
matt at ettus.com
Mon Feb 18 15:22:19 EST 2013
There are no units on those samples. You need an absolute amplitude
reference in order to determine the volts to number conversion.
On Mon, Feb 18, 2013 at 5:33 AM, senthil murugan
<amrita.senthil at gmail.com>wrote:
> I am trying to estimate noise power without injecting any signal in SBX
> board with USRP N210.
> 1. Carrier frequency is 2.452GHz with BW of 10MHZ.
> 2. Gain = 0dB and using Tx/Rx port.
> noise power = (sum of 64 samples of amplitude squared)/64.
> I am getting around -78 dB. If I try to evaluate dBm/Hz, I am getting
> -78 - 70 = -148 dB/Hz. Hence , it will be -118 dBm/Hz.
> Its not matching with theoretical value of -174 dBm/Hz + 5 dB = -169
> Where am I going wrong with my calculations?
> USRP-users mailing list
> USRP-users at lists.ettus.com
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