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Re: [Patch-gnuradio] gr_rotator fix/optimization

From: Matt Ettus
Subject: Re: [Patch-gnuradio] gr_rotator fix/optimization
Date: Fri, 07 Sep 2007 15:15:46 -0700
User-agent: Thunderbird (X11/20070326)

Dan Halperin wrote:
> I ran some quick trials and found that C takes around 18k (I was
> surprised it was this fast, actually!) iterations for the phaser
> amplitude to be off by 0.1%. So K around a hundred or a thousand should
> be good.

0.1% is -60dBc.  After 100K interations, it will be 0.55%  ( 0.999 ^
(100K/18K) ), which is only 45dB down.  On the other hand, if we do the
correction every 1000 points, the error will be -85 dBc   ( 0.999 ^
(1K/18K) ).

Thanks for investigating this!


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