Results 71 to 80 of about 752 (176)
Unitary and Hermitian fractional operators and their relation to the fractional Fourier transform [PDF]
, 1998 Inspired by the recent popularity of the fractional Fourier transform (FRFT) and motivated by the use of Hermitian and unitary operator methods in signal analysis, we introduce a new unitary fractional operator associated with the FRFT.
Akay, Olcay +2 more
core +1 more source
Fractional Mixed Weighted Convolution and Its Application in Convolution Integral Equations
Journal of Mathematics, Volume 2024, Issue 1, 2024.The convolution integral equations are very important in optics and signal processing domain. In this paper, fractional mixed‐weighted convolution is defined based on the fractional cosine transform; the corresponding convolution theorem is achieved.
Rongbo Wang, Qiang Feng, Ding-Xuan Zhou
wiley +1 more source
A Note on Operator Sampling and Fractional Fourier Transform [PDF]
, 2011 This paper presents that the kernel of the fractional Fourier transform (FRFT) satisfies the operator version of Kramer's Lemma (Hong and Pfander, 2010), which gives a new applicability of Kramer's Lemma.
Qingyue Zhang
core +1 more source
HMM‐Based Method for Aircraft Environmental Control System Turbofan Rolling Bearing Fault Diagnosis
Shock and Vibration, Volume 2024, Issue 1, 2024.In response to the high‐noise, nonlinear, and nonstationary characteristics of vibration signals from aircraft environmental control system (ECS) turbofan rolling bearings, this paper proposes a diagnostic method for the degree of ECS turbofan bearing faults based on the Hidden Markov Model (HMM).
Gang Yang +5 more
wiley +1 more source
Fractional Fourier transform of the Gaussian and fractional domain signal support [PDF]
, 2003 The fractional Fourier transform (FrFT) provides an important extension to conventional Fourier theory for the analysis and synthesis of linear chirp signals. It is a parameterised transform which can be used to provide extremely compact representations.
Capus, C.
core +1 more source
Journal of Electrical and Computer Engineering, Volume 2024, Issue 1, 2024.Smeared spectrum (SMSP) jamming is a deceptive jamming technique commonly used against linear frequency modulation (LFM) radar. This technique produces high‐density false targets that resemble a comb shape after pulse compression processing, resulting in both deceiving and suppressing effects. In order to suppress jamming effectively, a new antijamming
Zhenming Wen +3 more
wiley +1 more source
Performance Improvement by FRFT-OFDM for Visible Light Communication and Positioning Systems
PhotonicsIn indoor visible light communication (VLC) and visible light positioning (VLP) systems, the performance of conventional orthogonal frequency-division multiplexing (OFDM) schemes is often compromised due to the nonlinear characteristics and limited ...
Wenyang Li, Zixiong Wang, Jinlong Yu
doaj +1 more source
SYMMETRY PROPERTIES OF THE FRACTIONAL FOURIER TRANSFORM [PDF]
, 2011 Bu makalede, kesirli Fourier dönüşümü'nün (KFD) çift ve tek simetrik gerçek sinyaller için simetri özellikleri türetilmektedir. Açı parametresinin 2πφ=değeri için, KFD'nin simetri özellikleri klasik Fourier dönüşümü'nün simetri özelliklerine ...
AKAY, OLCAY
core
IEEE Photonics Journal, 2019 We propose a novel technique for joint modulation format identification and frequency offset (FO) estimation. The linear frequency modulation signal which is obtained by a direct current signal and Fractional Fourier Transform (FrFT) is superimposed on ...
Yuxiao Guo +6 more
doaj +1 more source
A Note on Operator Sampling and Fractional Fourier Transform [PDF]
, 2020 This paper presents that the kernel of the fractional Fourier transform FRFT satisfies the operator version of Kramer's Lemma Hong and Pfander, 2010 , which gives a new applicability of Kramer's Lemma.
Qingyue Zhang
core