SFDM creates a continuous AFDM waveform by holding instantaneous frequency at the wrapped chirp midpoint per interval while accumulating phase continuously, eliminating jumps, lowering out-of-band emissions, and preserving the original modulation matrix and receiver processing.
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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.
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Stepped Frequency Division Multiplexing: A Jump-Free Continuous-Time AFDM Waveform
SFDM creates a continuous AFDM waveform by holding instantaneous frequency at the wrapped chirp midpoint per interval while accumulating phase continuously, eliminating jumps, lowering out-of-band emissions, and preserving the original modulation matrix and receiver processing.
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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.