GENERAL COMMENTARY article Front. Sustain., 24 November 2022Sec. Quantitative Sustainability Assessment https://doi.org/10.3389/frsus.2022.1049362

Amplitude modulated continuous wave (AMCW) lidar systems commonly suffer from non-linear phase and amplitude responses due to a number of known factors such as aliasing and multipath inteference. In order to produce useful range and intensity information it is necessary to remove these perturbations from the measurements. We review the known causes of non-linearity, namely aliasing, temporal va...

Methods for calculating bit error rate (BER) using probability density function (PDF) of impairments (ISI, crosstalk, jitter etc.) have been studied and presented in the past. These approaches calculate PDF of the signal & impairments at the decision point based on linear system analysis and deduce the BER from tail probability. A typical high speed system also has significant non linearity in ...

Several LUT-based pre-distortion schemes using Saleh’s model for compensation of RF non-linearity have been studied recently. In this paper we propose a novel parameter-based predistorter to enhance the power efficiency of mobile OFDM transmitters using solid-state power amplifiers (SSPA). Both the non-linearity and inverse of the non-linearity are estimated as memory-less polynomials using Lea...

For many investors, it is important to predict the future trend of abnormal stock returns. Thus, in this research, the abnormal stock returns of the listed companies in Tehran Stock Exchange were tested since 2008- 2017 using three hypotheses. The first and second hypotheses examined the non-linearity and non-randomness of the abnormal stock returns ′ trend around the release date of annual fin...

Wiener systems consist of a linear dynamic system whose output is measured through a static non-linearity. In this paper we study the identification of single-input single-output Wiener systems with finite impulse response dynamics and polynomial output non-linearities. Using multi-index notation, we solve a least squares problem to estimate products of the coefficients of the non-linearity and...

In the dissertation, structural Finite Element Analysis is carried out. Both linear and non linear analysis is considered for the investigation. Geometry non linearity, material non linearity and boundary non linearity also called as contact analysis is considered. All the boundary conditions, loadings, material definitions considered are real in nature. Experimental validations are considered ...