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Re: [Discuss-gnuradio] USRP2 + WBX - Power measurement with different de
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From: |
Marcus D. Leech |
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Subject: |
Re: [Discuss-gnuradio] USRP2 + WBX - Power measurement with different decimation rates |
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Date: |
Tue, 23 Nov 2010 11:38:38 -0500 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) 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
http://www.sbrac.org