Tim Howe (@timbly5000)

Communications engineer: 35 years experience in RF and baseband processing (software and FPGA).

Hi,I've not done this for a while but what I would try is a Lagrange polynomial interpolator. You will need a fractional accumulator updating at the input sample...
There are variations on the integer IQ magnitude approximation (still with compute-friendly coefficient values) that give a lower error that that posted above and...

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