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Phase-Preserving Amplitude Subtraction and IRFS Filtering

[Category : - Telecommunications]
[Viewed 15 times]

The invention belongs to the fields of quantum and classical optoelectronics, radio communication, and interferometric sensing.
It provides a real-time method for suppressing slow drift, narrow-band interference, and fixed-pattern noise by subtracting the amplitudes of alternating reference (REF) and data (SIG) blocks in the frequency domain while preserving the full complex phase of the data signal.

The method converts REF and SIG blocks into spectra, performs adaptive amplitude subtraction
A_clean = |F_D| - alpha * |F_R|,
and reconstructs the corrected signal using the original phase.

Alternatively, the invention employs IRFS (Interference-Reversed Phase Selectivity), a second-order interference mechanism based on the correlation
Z(k) = F_D(k) * conj(F_R(k))
with suppression of the constant reference term.
The selective spectrum Z(k) is then returned to the time domain via inverse FFT.

The technique preserves all information-carrying phase components and removes drift and interference without degrading the signal.
It is applicable in optical and radio communication, FMCW/LiDAR systems, interferometers, and quantum processors.

Patent application filed on 16.08.2025. Full text available upon request.

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frybert (Czech Republic)

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