Abstract

This letter introduces fast-orthogonal frequency-division multiplexing (FOFDM) with index modulation (IM) based on discrete cosine transform (DCT) for optical wireless systems. For intensity-modulation and direct detection, the proposed approach realizes a real-valued intensity waveform by employing real-valued one-dimensional modulation formats and DCT; and brings about non-negativity via direct current bias. We shall establish that it attains up to 64% higher spectral efficiency (SE) with low order alphabets than conventional IM based approach on discrete Fourier transform and provides better flexibility to address energy efficiency/SE trade-off.

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