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