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Re: [Discuss-gnuradio] Noise Source Output ~3dB Higher on E310?
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From: |
Philip Balister |
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Subject: |
Re: [Discuss-gnuradio] Noise Source Output ~3dB Higher on E310? |
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Date: |
Tue, 26 Jan 2016 12:14:42 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
On 01/26/2016 11:35 AM, John Malsbury wrote:
> This was a surprising one. When set with a the same seed (regardless of
> value) and amplitude, the noise source (gaussian) seems to have 3 dB higher
> power when running on E310 vs. an i7 platform.
>
> (GNU Radio commit 8220b79653c6c7999a18fed075bdb1c41bca0613 on i7)
>
> (e3xx release 3 from here:
> http://files.ettus.com/e3xx_images/e3xx-release-3/)
Release 3 has 3.7.7.1 which does not have the fix for this problem.
Philip
>
> This problem came up when running unit tests on modems that check BER vs.
> Eb/n0.
>
> Has anyone come across this before?
>
> I'm sure there's a good reason/explanation for this - but I'm too tired to
> think of it.
>
> -John
>
>
>
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