Results 71 to 80 of about 3,627 (192)
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
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Variance-Gamma (VG) model: Fractional Fourier Transform (FRFT)
, 2022 7 pages, 9 figures.
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Deep Learning‐Based Active Jamming Suppression for Radar Main Lobe
IET Signal Processing, Volume 2024, Issue 1, 2024.Due to the development of digital radio frequency memory (DRFM), active jamming against the main lobe of the radar has become mainstream in electronic warfare. The jamming infiltrates the radar receiver via the main lobe, covering up the target echo information. This greatly affects the detection, tracking, and localization of targets by radar. In this
Yilin Jiang +4 more
wiley +1 more source
IET Signal Processing, Volume 2024, Issue 1, 2024.Multipath interference in radar signals caused by sea, ground, and other environments poses significant challenges to the target detection, tracking, and classification capabilities of radar systems. Existing methods for radar signal identification require labeled samples and focus mainly on the classification of normal signals.
Kang Yan +6 more
wiley +1 more source
Guangtongxin yanjiu, 2020 针对分数阶傅里叶变换（FRFT）对啁啾（Chirp）信号进行盲检测时存在运算量大的问题,文章提出一种针对Chirp信号参数估计的盲检测方法。首先利用改变窗长相位差法对Chirp信号进行粗估计,并利用最小二乘法进行拟合得到Chirp信号调频斜率粗估计值,然后通过FRFT对Chirp信号进行精细估计,并利用二分法对FRFT的阶次进行搜索,进一步降低算法的运算量。仿真结果表明,利用改变窗长相位差法和FRFT联合检测Chirp信号的方法,在低信噪比下具有较高精度的估计值,且其归一化均方误差接近克拉美罗下界 ...
廖烨, 刘国峰, 李康, 周文峰
doaj
Fractional Fourier detection of L\'evy Flights: application to Hamiltonian chaotic trajectories
, 2013 A signal processing method designed for the detection of linear (coherent) behaviors among random fluctuations is presented. It is dedicated to the study of data recorded from nonlinear physical systems.
Briolle, F., Leoncini, X., Ricaud, B.
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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
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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
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Enhanced monopulse radar tracking using fractional Fourier filtering in the presence of interference [PDF]
, 2010 Monopulse radars are used to track a target that appears in the look direction beam width. Significant distortion is produced when manmade high power interference (jamming) is introduced to the radar processor through the radar antenna main lobe (main ...
Elgamel, Sherif A.E.H., Soraghan, J.J.
core
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