FGFRFT splits the spectrum of a unitary GFT to treat λ=-1 exactly and approximates the complementary part by a length-L Fourier series, reducing online complexity to O(2 L N²) with derived error bounds.
Windowed fractional Fourier transform on graphs: Fractional translation operator and Hausdorff-Young in- equality,
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FGFRFT: Fast Graph Fractional Fourier Transform via Exact Spectral Splitting and Fourier-Series Approximation
FGFRFT splits the spectrum of a unitary GFT to treat λ=-1 exactly and approximates the complementary part by a length-L Fourier series, reducing online complexity to O(2 L N²) with derived error bounds.