Re: [Discuss-gnuradio] anyone help me understand usrp fpga code fragment which count rssi

On 08/04/2011 09:52 PM, Page Jack wrote:
> Hi Colby,
> I know cheaper in hardware, but now I don't understand how using IIR
> filter can compute the RSSI?
>
>
The power estimate in a complex channel is computed as:

AVG(I**2 + Q**2)

An IIR filter is a simple way of approximating the AVG part of that
equation, and computing the
absolute value is another approximation for the I**2 and Q**2 part.
You'll notice in the RSSI
section that it essentially computes the absolute value.

--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio