DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) has been introduced to visible light networking framework for connected vehicles (LiNEV) systems as a modulation and scheme. This is overcome the light-emitting diode (LED) bandwidth limitation, well reduce inter-symbol interference caused by multipath road fading. Due implementation of inverse fast Fourier transform, DC-OF...

The fractional Fourier transform (FRFT), which is a family of linear transformations generalizing the classical transform, has been used in fields filter design, signal processing, phase retrieval, and pattern recognition due to its unique properties. FRFT can be interpreted as decomposition terms chirps. In this paper, for first time, best our knowledge, we introduce an optical (OFRFT)-based o...

Context. In the dense and cold prestellar cores, many species freeze out onto grains to form ices. The most conspicuous case is that of CO itself. Only upper limits of this depletion amplitude can be estimated because the CO emission from the external undepleted layers mask the emission of CO left inside the depleted region. The finite signal-to-noise ratio of the observations is another limita...

Abstract Background Although increasing evidence showed the correlations between white matter hyperintensities (WMHs) and cognitive impairment, relationship them is still modest. Many researchers began to focus on variation caused by heterogeneity of WMH. We tried explore pathological in WMH using diffusion tensor imaging (DTI), so as provide a new insight into future research. Methods Diffusio...

Being sensitive to synchronization errors, symbol timing is a key factor affecting the performance of orthogonal frequency division multiplexing (OFDM) -based visible light communication (VLC) systems. A novel method based on odd-even symmetry for direct current biased optical OFDM (DCO-OFDM) investigated in this paper. The proposed produces an excellent pulse-like metric, resulting sharper pea...

The bound of the information transmission rate direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) for visible light communication (VLC) with finite-alphabet inputs is yet unknown, where corresponding spectral efficiency (SE) and energy (EE) stems out as open research problems. In this paper, we derive exact achievable DCO-OFDM system first time. Furthermore, inv...

The nonlinear distortion introduced by the dead time strongly limits throughput of highly sensitive SPAD-based optical wireless communication (OWC) systems. Optical OFDM can be employed in systems with SPAD arrays to improve spectral efficiency. In this work, a theoretical performance analysis OWC system asymmetrically-clipped (ACO-OFDM) is presented. impact nonlinearity on investigated. additi...