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Re: [Discuss-gnuradio] USRP output power

From: Nick Foster
Subject: Re: [Discuss-gnuradio] USRP output power
Date: Mon, 25 Apr 2011 08:42:02 -0700

On Mon, 2011-04-25 at 21:04 +0900, Songsong Gee wrote:
> I want to figure out bit error rate for certain signal to noise ratio
> Thus I have to know SNR value which is a function of energy per one
> bit (Eb) and noise characteristic (N0)
> Let's assume I know noise characteristic, N0 (in fact I gathered noise
> data and figured out N0)
> For now, I have to figure out energy per one bit (Eb)
> My system transmits 1 bit every 31.25ms (32kbps) and using RFX400
> (100+mW output)
> each bit has magnitude 32,767 or zero (amplitude shift keying) in the
> GNU Radio scope plot
> (I think 32,767 is the maximum value and it might have a voltage
> value, 2 V. I hope it's right)
> In this situation, if bit has magnitude 32,767
> what energy value each bit does have?

The USRP does not have a calibrated output or input and you will have to
calibrate it using a measuring receiver, calibrated signal generator, or
power meter in order to obtain meaningful results.


> I have some difficulties on it.
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