Re: Re: power control when packets transmitting

Hi:

I have a question about the transmit amplitude. In the example file
“transmit_path.py”, the amplitude is range from 0 to 32768. But what
does these number mean? Also, when the other GNUradio nodes receive the
packet, how do I measure the receive power or the relative receiving
amplitude?

Thanks in advanced!

KC

On Fri, May 16, 2008 at 03:54:55PM -0400, Kuo-Chun Huang wrote:

Hi:

I have a question about the transmit amplitude. In the example file
“transmit_path.py”, the amplitude is range from 0 to 32768. But what
does these number mean?

They serve as a constant multiplier of the signal. They are not
directly tied to a calibrated power level. As part of the work on the
USRP2, there has been some discussion of a normalized power level /
signal level going to/from the USRP2, measured at some not yet
determined reference point in the system. There would need to be a
framework that knew about the various daughterboards, etc.

Also, when the other GNUradio nodes receive the packet, how do I
measure the receive power or the relative receiving amplitude?

There are several ways you could do this. Average magnitude squared is
one way.

Eric

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