Results 101 to 110 of about 136,074 (335)
Simple 2D chaotic remapping scheme for securing optical communication networks
Journal of Engineering, 2019 In this work, a simple and new method is proposed to simultaneously improve the physical layer security and the transmission performance of the optical orthogonal frequency division multiplexing system, by combining orthogonal frequency division ...
Hiba Abdel Wahab Jabori +1 more
doaj +1 more source
Downlink Precoding for Massive MIMO Systems Exploiting Virtual Channel Model Sparsity
, 2017 In this paper, the problem of designing a forward link linear precoder for Massive Multiple-Input Multiple-Output (MIMO) systems in conjunction with Quadrature Amplitude Modulation (QAM) is addressed.
Ayanoglu, Ender, Ketseoglou, Thomas
core +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
PolSpec: Polarisation‐Based Detection for Versatile, Cost‐Effective Rapid Hyperspectral Imaging
Journal of Biophotonics, EarlyView.“PolSpec” is a fast, flexible, data efficient and cost‐effective technique for hyperspectral imaging utilising polarisation‐based spectral modulation. Using data‐efficient representation of spectral information on vector plots, it facilitates rapid visualisation and segmentation of spectral contrast to classify sample features. As a proof of concept, a
Huihui Liu +5 more
wiley +1 more source
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
Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, EarlyView.ABSTRACT Climate change is contributing to geographic range shifts in many bird species, with possible exposure to novel diets. How individuals respond physiologically across chronic time frames to the interacting effects of diet and environmental temperature has been little explored.
Michael J. Campbell +2 more
wiley +1 more source
Quadrature Spatial Modulation Orthogonal Frequency Division Multiplexing [PDF]
, 2018 This paper investigates the application of quadrature spatial modulation (QSM) to orthogonal frequency division multiplexing (OFDM). In comparison to spatial modulation OFDM (SM-OFDM), the proposed QSM-OFDM achieves an enhanced spectral efficiency by ...
Adejumobi, B. S., Pillay, N.
core +1 more source
BER Performance Analysis of OFDM, W-OFDM and F-OFDM for 5G Wireless Communications [PDF]
, 2020 Orthogonal Frequency Division Multiplexing (OFDM) is a pertinent multi-carrier modulation approach that is more immune to frequency selective fading. In the 5G waveform, in order to reduce the traffic in OFDM based on technology, it is important to re ...
MD. Maruf Hosain +3 more
core +1 more source
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
DISCO: A low‐cost device‐instrumented Secchi disk for water clarity observations
Limnology and Oceanography: Methods, EarlyView.Abstract Water clarity regulates irradiance penetration in aquatic environments, influencing physical and biological dynamics: irradiance penetration affects heat transfer in the water column and provides energy through photosynthetically active radiation (PAR) in the euphotic zone, which is vital for light‐dependent organisms.
Gaia Donini, Sebastiano Piccolroaz
wiley +1 more source