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Re: [Discuss-gnuradio] Fast, Single-Sample Phase Rotation

From: Mark Haun
Subject: Re: [Discuss-gnuradio] Fast, Single-Sample Phase Rotation
Date: Tue, 26 May 2015 16:53:57 -0700
User-agent: Mutt/1.5.21 (2010-09-15)

Traditionally this was a job for CORDIC.  I don't know what the tradeoffs
look like on a modern processor, though.  If a significant part of your
algorithm operates in phase/magnitude, might you consider a rect->polar

John Malsbury address@hidden wrote:
> I have a  complex phase rotation function that uses a pre-generated sin/cos
> LUT and some basic multiple/adds.
> As it turns out, the rotation calc, which uses "straight" C/C++ math is
> still the bottleneck in a demod.
> I was wondering, is there some uber-efficient rotation block/class I should
> be using?   I notice there is a volk kernel for the job and gr_rotator.
> But I also should mention that the phase rotation operation must happen one
> sample at a time.  This is due to the sequential nature of the algorithm -
> ie.  I can't align and call a kernel with hundreds of nicely-aligned
> samples.
> Any advice?
> -John

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