Results 41 to 50 of about 6,346,538 (309)

Bit error simulation of DQPSK for a slow frequency hopping CDMA system in mobile radio communications [PDF]

, 1995
Spread spectrum (SS) techniques seem to be an attractive alternative to conventional narrow-band modulation. In this paper a frequency hopping (FH) system model based on slow FH (SFH) is proposed.
Mortazavi, SH, Jones, JA, McGeehan, JP, Beach, MA   +3 more
core   +1 more source

A New Method to Verify the Measurement Speed and Accuracy of Frequency Modulated Interferometers

Applied Sciences, 2021
The measurement speed and measurement accuracy of a displacement measuring interferometer are key parameters. To verify these parameters, a fast and high-accuracy motion is required.
Toan-Thang Vu, Thanh-Tung Vu, Van-Doanh Tran, Thanh-Dong Nguyen, Ngoc-Tam Bui   +4 more
doaj   +1 more source

Transmitter and Receiver Window Designs for Orthogonal Time-Frequency Space Modulation [PDF]

IEEE Transactions on Communications, 2020
In this paper, we investigate the impacts of transmitter and receiver windows on the performance of orthogonal time-frequency space (OTFS) modulation and propose window designs to improve the OTFS channel estimation and data detection performance.
Zhiqiang Wei, W. Yuan, Shuangyang Li, Jinhong Yuan, Derrick Wing Kwan Ng   +4 more
semanticscholar   +1 more source

Comparative Analysis of Mathematical Models of Tracking Radio Altimeters

Известия высших учебных заведений России: Радиоэлектроника, 2022
Introduction. Tracking radio altimeters of low altitudes are widely used in civil aviation. These devises use periodic frequency modulated continuous wave (FMCW) signals, while altitude measurements are based on processing the beat signal processing. For
A. A. Monakov, A. A. Tarasenkov
doaj   +1 more source

Monitoring ultrafast vibrational dynamics of isotopic molecules with frequency modulation of high-order harmonics

Nature Communications, 2018
Molecules constituted by different isotopes are different in vibrational modes, making it possible to elucidate the mechanism of a chemical reaction via the kinetic isotope effect.
Lixin He, Qingbin Zhang, P. Lan, W. Cao, Xiaosong Zhu, Chunyang Zhai, Feng Wang, Wenjing Shi, Muzi Li, Xue-Bin Bian, P. Lu, A. Bandrauk   +11 more
semanticscholar   +1 more source

A Novel Strategy for Signal Denoising Using Two-Layer SVD and Its Application to Rub-Impact Fault Diagnosis of Aeroengine

Applied Sciences, 2022
The rub-impact fault, which occurs in the aeroengine, can cause frequency modulation (FM) in its vibration signal. Oscillated instantaneous frequency (IF) is a phenomenon of such a modulation mode, which carries critical fault information from the ...
Peng Zhang, Shunming Li, Kun Xu, Siqi Gong, Keyi Zhan, Maoxian Shen, Jun Tian, Xin Yuan   +7 more
doaj   +1 more source

Measurement and Control System for Atomic Force Microscope Based on Quartz Tuning Fork Self-Induction Probe

Micromachines, 2023
In this paper, we introduce a low-cost, expansible, and compatible measurement and control system for atomic force microscopes (AFM) based on a quartz tuning fork (QTF) self-sensing probe and frequency modulation, which is mainly composed of an embedded ...
Yongzhen Luo, Xidong Ding, Tianci Chen, Tao Su, Dihu Chen   +4 more
doaj   +1 more source

Temporal modulation transfer functions in the European Starling (Sturnus vulgaris): II. Responses of auditory-nerve fibres [PDF]

, 1995
The temporal resolution of cochlear-nerve fibres in the European starling was determined with sinusoidally amplitude-modulated noise stimuli similar to those previously used in a psychoacoustic study in this species (Klump and Okanoya, 1991).
Klump, Georg M., Gleich, Otto, O. Gleich, G.M. Klump   +3 more
core   +1 more source

A Low Inrush Current Pre-Charging Strategy of M3C with Improved Nearest Level Modulation

Energies
The modular multilevel matrix converter (M3C) can perform AC/AC conversion directly. However, M3C operation often requires a pre-charging process, which can be challenging due to the need for fast pre-charging with low inrush current.
Rufei He, Yikai Li, Yumin Peng, Yiming Ma, Fanqi Huang, Hailong Li, Wei Luo   +6 more
doaj   +1 more source

Frequency Modulation Approach for High Power Density 100 Hz Piezoelectric Vibration Energy Harvester

Sensors, 2022
Piezoelectric vibration energy harvester (PVEH) is a promising device for sustainable power supply of wireless sensor nodes (WSNs). PVEH is resonant and generates power under constant frequency vibration excitation of mechanical equipment.
Dengfeng Ju, Lu Wang, Chunlong Li, Hui Huang, Hongjing Liu, Kewen Liu, Qian Wang, Xiangguang Han, Libo Zhao, Ryutaro Maeda   +9 more
doaj   +1 more source