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We propose an orthogonal circulant matrix transform (OCT) based precoding scheme for VLC and experimentally demonstrate 400-Mb/s transmission over 1-m. The scheme outperforms conventional DFT-precoding and exhibits significantly reduced complexity than the adaptive loading scheme.
In the area of computer vision, pattern recognition and image processing, image match is a research hotspot with important theoretical significance and practical value. Recently, the image matching algorithm based on SIFT has drown wide attention for its outstanding local feature matching performance. In view of high computation complexity, poor anti-noise ability, and difficulty for practical use...
We demonstrate experimentally adaptive recursive-least-square frequency-domain equalization (RLS-FDE) for mode-division-multiplexing. The RLS-FDE algorithm improves convergence speed as transmission distance increases. For MDM transmission over a 1,000-km few-mode fiber, the convergence speed was increased by 17.5 times in comparison with LMS-FDE.
We propose and investigate a generalized quadrature phase-shift keying (QPSK) partitioning algorithm for carrier frequency offset (CFO) estimation in coherent optical 16-quadrature amplitude modulation (QAM) receivers. The algorithm utilizes the phase difference between the samples with different time-domain separations, so that the estimation accuracy can be significantly enhanced. We propose a computationally...
We propose a novel DFT-based implementation for optical fast OFDM (FOFDM), by which 4-ASK single-side-band FOFDM avoids the use of Hilbert transform, which is required in DCT-based FOFDM, and exhibits similar complexity, performance, and spectral efficiency as conventional 16-QAM OFDM.
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