Results 21 to 30 of about 11,828,347 (311)

A perturbative approximation to DFT/MRCI: DFT/MRCI(2) [PDF]

, 2022
We introduce a perturbative approximation to the combined density functional theory and multireference configuration interaction (DFT/MRCI) method. The method, termed DFT/MRCI(2), results from the application of quasi-degenerate perturbation theory and ...
Neville, Simon P., Schuurman, Michael S., Michael S. Schuurman, Simon P. Neville   +3 more
core   +1 more source

Discrete Fourier Transform with Denoise Model Based Least Square Wiener Channel Estimator for Channel Estimation in MIMO-OFDM

Entropy, 2022
Multiple-input Multiple-Output (MIMO) systems require orthogonal frequency division multiplexing to operate efficiently in multipath communication (OFDM).
Dhanasekaran S, SatheeshKumar Palanisamy, Fahima Hajjej, Osamah Ibrahim Khalaf, Ghaida Muttashar Abdulsahib, Ramalingam S   +5 more
doaj   +1 more source

DFT-Based Modulation and Demodulation for Affine Frequency Division Multiplexing

, 2023
This paper deals with discrete Fourier transform (DFT)-based modulation and demodulation techniques for affine frequency division multiplexing (AFDM) instead of discrete affine Fourier transform (DAFT).
Vincent Savaux (8312571)
core   +1 more source

Comparative Density Functional Theory Approaches for Investigating the Electro-Optical Properties of 5CB Liquid Crystal Molecules [PDF]

Progress in Physics of Applied Materials
In the present paper, we have reported the most suitable DFT methods to investigate the electro-optical properties of the liquid crystal molecules. Hybrid as well as meta GGA functional like ωB97XD, M06 and PBE0 are often used to optimize and calculate ...
Yogesh Kumar, Tika ram, Narinder Kumar
doaj   +1 more source

DFT-Machine Learning Approach for Accurate Prediction of pK_a

, 2021
In this study, we propose a novel method of pKa prediction in a diverse set of acids, which combines density functional theory (DFT) method with machine learning (ML) methods.
Yao-Hao Liu (11473689), Nessa Majaya (11473692), Jin Young Kim (271185), Seung Soon Jang (1408210), Hyunchul Ju (11473695), Omar Allam (9695412), Robin Lawler (9380157)   +6 more
core   +1 more source

DFT-optimized structures of carbene derivatives on 2D MoS2 surface

, 2021
DFT-optimized structures of carbene derivatives on 2D MoS2 ...
George C Schatz (8764612), Leighton Jones (11234697)   +1 more
core   +1 more source

Fast heart rate extraction using CW Doppler radar with interpolated discrete Fourier transform algorithm

AIP Advances, 2020
Doppler radar-based fast heart rate (HR) extraction has great application potential in stress and emotion recognition, anxiety treatments, etc.
Zi-Kai Yang, Heping Shi, Sheng Zhao, Xiang-Dong Huang, Zhiwei Guan   +4 more
doaj   +1 more source

A Sparse Algorithm for Computing the DFT Using Its Real Eigenvectors

Signals, 2021
Direct computation of the discrete Fourier transform (DFT) and its FFT computational algorithms requires multiplication (and addition) of complex numbers.
Rajesh Thomas, Victor DeBrunner, Linda S. DeBrunner   +2 more
doaj   +1 more source

DFT-relaxed structures and phonon plots

, 2023
DFT-relaxed structures and phonon plots discussed in manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.
Jeremiah Tidey (11746808)
core   +1 more source

Novel Tone Reservation Method for DFT-s-OFDM [PDF]

IEEE Wireless Communications Letters, 2021
In this letter, a novel guard-tone reservation (GTR) method is proposed to reduce the peak-to-average power ratio (PAPR) of discrete Fourier transform-spread-orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform. Unlike existing PAPR reduction methods, the proposed GTR operates directly in the data symbol domain, estimating the peaks through
Selahattin Gökceli, Ismael Peruga, Esa Tiirola, Kari Pajukoski, Taneli Riihonen, Mikko Valkama   +5 more
openaire   +4 more sources