Results 91 to 100 of about 140,441 (346)
Achromatic 3D Multi‐Color Orbital Angular Momentum Holography
Advanced Science, EarlyView.This work presents an achromatic 3D multicolor orbital angular momentum (OAM) holography based on spatial multiplexing. By integrating wavelength‐specific lens functions onto monochromatic Fourier OAM‐dependent holograms and high‐resolution spatial discretization and interleaving via two‐photon lithography (TPL), the approach addresses axial chromatic ...
Hang Su +5 more
wiley +1 more source
Advanced Science, EarlyView.A single‐cell metasurface is designed to multiplex holographic images across both spin and wavelength channels using a single‐phase map. By employing inverse design and automatic differentiation, the metasurface achieves 36 channel multiplexing across the visible to near‐infrared spectrum.
Cherry Park, Youngsun Jeon, Junsuk Rho
wiley +1 more source
Digital Domain Power Division Multiplexed Dual Polarization Coherent Optical OFDM Transmission [PDF]
arXiv, 2017 Capacity is the eternal pursuit for communication systems due to the overwhelming demand of bandwidth hungry applications. As the backbone infrastructure of modern communication networks, the optical fiber transmission system undergoes a significant capacity growth over decades by exploiting available physical dimensions (time, frequency, quadrature ...
arxiv
Efficient VLSI implementation of FFT for orthogonal frequency division multiplexing applications
IET Circuits Devices Syst., 2014 In an orthogonal frequency division multiplexing (OFDM)-based digital transmitter, the inverse fast Fourier transform (IFFT) processing unit consumes the most hardware area and power, especially because of the twiddle multipliers in the Cooley–Tukey ...
V. Arunachalam, Alex Noel Joseph Raj
semanticscholar +1 more source
ANALISIS KINERJA ALGORITMA ADAPTIVE BEAMFORMING PADA SISTEM ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) Performance Analysis of Adaptive Beamforming Algorithm on Orthogonal Frequency Division Multiplexing (OFDM) System [PDF]
, 2006 ABSTRAKSI: Seiring dengan meningkatnya permintaan layanan dengan laju data tinggi akan berdampak pada penggunaan bandwidth yang sangat lebar. Dalam kasus ini, kanal akan bersifat frequency-selective, yang akan menyebabkan munculnya multipath fading yang ...
Sandy
core
Blind Joint Soft-Detection Assisted Slow Frequency-Hopping Multicarrier DS-CDMA [PDF]
, 2000 A novel multiple-access scheme based on slow frequency-hopping multicarrier direct-sequence, code-division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrow-band ...
Hanzo, L., Yang, L-L.
core +1 more source
Personalized Kirigami Strain Sensors for in vivo Applications
Advanced Intelligent Systems, EarlyView.Rapid prototyping of strain sensors is demonstrated using a laser cutter that both converts carbon‐based material to strain responsible graphene and generates cuts in a kirigami‐style pattern that allows enhanced substrate flexibility. This method is used to generate wearable sensors for monitoring heart rate, limb/finger motion, and abdominal ...
Siheng Sean You +7 more
wiley +1 more source
Faster than Nyquist Transmission by Non-Orthogonal Time Division Multiplexing of Nyquist Sinc Sequences [PDF]
arXiv, 2018 One possibility to break down the capacity limit in optical transmission systems are higher spectral efficiencies, enabled by Faster-than-Nyquist signaling. Here we present the utilization of non-orthogonal time division multiplexing of sinc pulse sequences for this purpose.
arxiv
IEEE Transactions on Communications, 1999 A loss of subchannel orthogonality due to time-variant multipath channels in orthogonal frequency division multiplexing (OFDM) systems leads to interchannel interference (ICI) which increases the error floor in proportion to the Doppler frequency.
W. Jeon, K. Chang, Y. Cho
semanticscholar +1 more source
Extended GFDM Framework: OTFS and GFDM Comparison
, 2018 Orthogonal time frequency space modulation (OTFS) has been recently proposed to achieve time and frequency diversity, especially in linear time-variant (LTV) channels with large Doppler frequencies.
Chafii, Marwa +3 more
core +1 more source