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We experimentally demonstrate an IFFT/FFT size efficient discrete Fourier transform (DFT)-spread orthogonal frequency-division multiplexing (OFDM) based on complex-valued IFFT/FFT operations without Hermitian symmetry constraint at the input, for short-reach intensity-modulated and directly-detected optical fiber transmission systems. The only complex-valued IFFT-based OFDM has the similar peak-to-average...
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