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stronger unitary testing in oai_dfts.c. Modifications for ARM NEON and x86 versions. Some changes in AVX2 optimizations for skylake architecture

knopp requested to merge fft_dynamic_scaling into develop

This adds a dynamically adjustable scaling scheduler for the OAI dfts ( except for the radix 2^a3^b4^c transforms for precoding). This provides a significant improvement in SQNR for transmit and receive. Unitary simulations now include SQNR computations for QPSK/256QAM inputs and sinusoids. Gaussian noise to be added next.

Closes #543

Edited by Francesco Mani

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