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Re: [Discuss-gnuradio] USRP2 + WBX - Power measurement with different de

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] USRP2 + WBX - Power measurement with different decimation rates
Date: Tue, 23 Nov 2010 11:38:38 -0500
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 11/23/2010 07:17 AM, Vladutzzz wrote:
> Dear all,
> I am using an USRP2 module with a WBX daughterboard.
> I am currently interested in power level measurements, and have tried
> measuring band power with different decimations.
> I've noticed, that if I try to measure the same exact band using different
> decimation rates and their appropriate FIR filters, the results differ.
> Has anyone else come across this?
> Does anyone know why this happens?
Two things:

Different decimations may use one, two , or no half-band filters in the
decimator.  For decimations
  that are even and a multiple of 4, two half-bands are used.  For
decimations that are simply
  even, a single half-band is used, and for odd decimations, no half
bands are used.  Odd
  decimation is not recommended.

Also, total measured power is proportional to bandwidth.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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