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

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] anyone help me understand usrp fpga code fragment which count rssi
Date: Thu, 04 Aug 2011 22:00:23 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

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

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