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From: | Derek Kozel |
Subject: | Re: [Discuss-gnuradio] How does Rx Gain affect the incoming signal? GNURadio IEEE 802.11a/g/p |
Date: | Thu, 6 Jul 2017 12:32:12 +0100 |
I'm doing the next experiment:Hi all.I'm trying to understand how Rx gain, the paremeter that is set in the USRP Source block, affects the input signal. I would like to have an equation for that.
- I take the input signal from the USRP Source block to a MAG^2 block.
- From MAG^2 block to a moving average with a window of 50K.
- My sample rate is 10M that means that my moving average is calculated over 5ms.
- I'm sending a signal from a transmitter each 5ms.
- Finally I capture the value of the moving average, which is always around an average value.
Now, I change Rx gain and it is what i get:
The value of the output of the moving average is changing very strange. I was trying to write an equation for that, but i wasn't able, i used Rx gain in dB, in dBm as a constant, but i wasn't able to build a relation. In an equation i'm doing as follow:
Then I think that if I include Gtx, my equation results in:
But that doesn't make sense with the data that I get.
I would really greatful if someone can explain where is my mistake.
Thanks in advance.
Best regards,
Cristian
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