Non-coherent signal with unknown delay and Doppler is recovered by Gabor Division/Spread Spectrum System (GD/S). A transmitted signal in GD/S is expressed by a Gabor expansion whose expansion coefficient is a product of time domain (TD) and frequency domain (FD) spread spectrum (SS) codes. A receiver in GD/S employs multiple TD integrators with TD SS codes and a prescribed delay and FD integrat...

Abstract To improve the accuracy of partial discharge (PD) pattern recognition by jointing time-domain (TD) and frequency-domain (FD) information, a time-frequency (TF) fusion method via convolution neural network (CNN) is proposed in this paper. Firstly, PD signals are represented waveform images transformed into envelope variational mode decomposition-based Hilbert marginal spectrum (VHMS). S...

This paper adds to the existing body of knowledge by incorporating role fiscal decentralization (FD) in influencing CO 2 emissions. Therefore, this study looked at effect FD on emissions presence nonrenewable energy consumption (NRE), renewable (REN), gross domestic product (GDP), and trade openness (TOP) for period 1994–2018 Japan. Thus, current work intends fill gap employing econometric tech...

There is an ongoing discussion in the broadband wireless world about the respective benefits of orthogonal frequency division multiplexing (OFDM) and single carrier with frequency domain equalization (SC-FD). SC-FD allows for more relaxed front-end requirements, of which the power amplifier efficiency is very important for battery-driven terminals. OFDM, on the other hand, can yield improved BE...

This article investigates the influence of four causal frequency-dependent (FD) soil models and their impact on responses a multiphase overhead transmission line (OHTL) with ground wires, generated by lightning strike. The FD proposed Longmire-Smith (LS), Messier (M), Portela (P) Alípio-Visacro (AV) are considered. ground-return impedance admittance matrices computed Nagakawa approach for both ...

A special pilot pattern across two OFDM symbols is devised for channel estimation in OFDM systems with IQ imbalance at receiver. Based on this pilot pattern, a high-efficiency time-domain (TD) least square (LS) channel estimator is proposed to suppress channel noise by a factor of N/(L+1) in comparison with the frequency-domain LS one in [1] where N and L+1 are the total number of subcarriers a...

In this work, we extend the finite-difference contrast source inversion (FDCSI) method to the frequency-domain elastic wave equations, where the parameters describing the subsurface structure are simultaneously reconstructed. The FD-CSI method is an iterative nonlinear inversion method, which exhibits several strengths. First, the finite-difference operator only relies on the background media a...

To date, a number of numerical methods, including the popular Finite-Difference Time Domain (FDTD) technique, have been proposed to simulate Ground-Penetrating Radar (GPR) responses. Despite having a number of advantages, the finite-difference method also has pitfalls such as being very time consuming in simulating the most common case of media with high dielectric permittivity, causing the for...

Abstract— The bit error rate (BER) performance of DSCDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE). However, for a small spreading factor SF, the residual inter-chip-inference (ICI) degrades the BER performance. In this paper, we propose an iterative frequency-domain ICI cancellation (FD-ICIC) scheme for DS-CDMA. In t...

A growing stream of research in accounting and finance tests the extent to which the tone of financial disclosure narrative, also referred to as its qualitative information, affects security prices, over and above the disclosed financial performance. These studies typically measure tone by counting the relative frequency of positive versus negative words in a given disclosure such as earnings p...