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

From: John Malsbury
Subject: [Discuss-gnuradio] Fast, Single-Sample Phase Rotation
Date: Tue, 26 May 2015 16:37:22 -0700

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?


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