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Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210
From: |
Daniele Nicolodi |
Subject: |
Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210 |
Date: |
Wed, 18 Jun 2014 10:39:14 +0200 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
On 18/06/2014 01:25, Stephen Harrison wrote:
> There is a good treatment of errors in the CORDIC algorithm due to
> finite word length in this paper from IEEE transactions: The
> Quantization Effects of the CORDIC Algorithm (Yu Hen Hu, Senior Member,
> IEEE). I reproduced the results of section IV fairly easily a while ago.
> There are numerical errors in both amplitude and phase but you are
> right, this is not the cause of the frequency offset you observe.
Just for the sake of academic discussion (and without having read the
paper): any amplitude error can be seen as a phase error, however in
this specific case I would expect those to have the same periodicity of
the generate sine wave. Therefore they cannot account for a frequency
error. Am I wrong?
Cheers,
Daniele