[USRP-users] USRP transmission power
alokranjan007 at hotmail.com
Thu Apr 30 06:25:26 EDT 2015
Thank you for your prompt reply on the mentioned question. Since, I am new to the USRP community so I need some more expert suggestion from your end. I am just using the benchmark python script i.e. benchmark_tx.py and benchmark_rx.py for sending and receiving. Please Find below my complete set up,
Say, benchmark_tx.py -f 500e6 -M 0.5 --tx -gain=30 --tx-amplitude=0.8 -m qam
using the same for benchmark_rx.py also.
Would you please comment that how can i get the transmission power at the above mentioned setup.
However, i am able to get the avg received power per sample at receiver. say for eg. 8.8836e-06.
SO can I simply square the avg received power to get the transmitted power at that particular frequency and gain??
Thank you , Best Regards
Date: Thu, 30 Apr 2015 11:53:45 +0200
To: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] USRP transmission power
From: usrp-users at lists.ettus.com
How can I calculate the transmission power?
the power you transmit of course depends primarily on the signal you
transmit, on the TX gain you set, on your individual antenna, on the
frequency you're on, and to a certain degree on individual component
tolerances on the transmitting WBX. The only way of knowing
your power is measuring in exactly the set up you have.
However, the USRPs/daughterboards are quite linear over quite a
large range, so if you take a signal, measure the power, and then
use the same signal but multiplied with 0.5, you'll get one fourth
of the energy -- thus, you can generally assume signal energy to be
proportional to the square of your digital samples' magnitude.
Another question i have, can i change the
transmission power for every transmission purpose?
Of course. Just change the signal you're transmitting, or change the
TX gain, or do both.
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