Results 11 to 20 of about 425,179 (247)

A Comprehensive Comparison and Analysis of Several Intensity Modulations Based on the Underwater Photon-Counting Communication System

Frontiers in Physics, 2022
Underwater wireless optical communication is facing absorption, scattering problems, which, in principle, can be greatly resolved by underwater photon-counting communication (UPCC) technology that exhibits high-sensitivity communication characteristics ...
Xiaotian Han, Xiaotian Han, Peng Li, Chang Chang, Duorui Gao, Dongquan Zhang, Peixuan Liao, Wei Wang, Xiaoping Xie, Xiaoping Xie   +9 more
doaj   +1 more source

Spectral characteristics of DDPM streams and their application to all‐digital amplitude modulation

Electronics Letters, 2021
A new closed‐form expression of the spectral coefficients of the digital streams obtained by dyadic digital pulse modulation is presented and validated in this letter.
P. S. Crovetti
doaj   +1 more source

Comparisons of Loss Reduction Techniques Based on Pulsewidth Modulation and Model Predictive Control for Three-Phase Voltage Source Inverters

Machines, 2023
Due to the lack of comparative studies between discontinuous pulse-width modulation and model predictive control methods for reducing switching losses in two-level three-phase voltage source inverter, a comparative analysis of a generalized discontinuous
Minh Hoang Nguyen, Sangshin Kwak, Seungdeog Choi   +2 more
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An improved local oscillator modulation of modulated sampling scheme for multiple mono-pulse radar signals reconstruction

EURASIP Journal on Advances in Signal Processing, 2022
The modulated sampling scheme can intercept noncooperative signals distributed in a wide frequency band by using a single receiving channel, which is an efficient architecture in many radar and communication applications.
Zhaoyang Qiu, Minhong Sun, Jun Zhu, Xuyang Teng, Huina Song   +4 more
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Waveform optimization technology of missile borne radar based on FSK-PSK composite modulation for anti repeater jamming

Xibei Gongye Daxue Xuebao, 2022
Aiming at the waveform of missile borne radar is simple and easy to be affected by the repeater jamming in the terminal guidance, an anti-jamming waveform optimization algorithm based on the frequency shift keying(FSK) and phase shift keying(PSK ...
FEI Zhiting, ZHAO Min, ZHANG Jindong, LI Chen, ZHU Xiaohua   +4 more
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Accurate Estimation of LPI Radar Pulse Train Parameters via Change Point Detection

IEEE Access, 2023
Estimating the time of arrival (TOA), pulse width (PW), and pulse repetition interval (PRI) is critical for identifying the low probability of intercept (LPI) radar signals as it is common in electronic warfare (EW) to experience a pulse train being ...
Jong-Hyeon Bang, Do-Hyun Park, Wonjin Lee, Doohwan Kim, Hyoung-Nam Kim   +4 more
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ANALYSIS OF RESCUE RADAR NOISE IMMUNITY UNDER BROADBAND INTERFERENCE [PDF]

Radio Physics and Radio Astronomy
Subject and Purpose. The subject of the research is the statistical characteristics of the signal, noise, and interference and their distribution functions.
O. V. Sytnik, S. O. Masalov
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The Application Research of Atmospheric Optical Communication in Joint Modulation Transmission System

Guangtongxin yanjiu, 2021
Aiming at the demand of high spectrum efficiency and low bit error rate of Wireless Optical Communication (WOC) technology, a joint modulation method of Pulse Amplitude Modulation (PAM) and Pulse Position Modulation (PPM) is proposed.
Le-kun DENG, Ning HE, Chen-chen WU, Yue WU   +3 more
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A precessing accretion disc in the intermediate polar XY Ari? [PDF]

, 2007
XY Ari is the only intermediate polar to show deep X-ray eclipses of its white dwarf. Previously published observations with Ginga and Chandra have also revealed a broad X-ray orbital modulation, roughly antiphased with the eclipse, and presumed to be ...
A. J. Norton, Allan, Barrett, Beardmore, Cannizzo, Clarkson, Ezuka, Foulkes, Halpern, Hellier, Hellier, Hellier, Hellier, Hellier, Homer, K. Mukai, Kamata, Kamata, Koyama, Leins, Littlefair, Matthews, Norton, Norton, Parker, Patterson, Patterson, Salinas, Schwarzenberg-Czerny, Smith, Terada, Tovmassian, Watson   +32 more
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Indirect active and reactive powers control of doubly fed induction generator fed by three-level adaptive-network-based fuzzy inference system – pulse width modulation converter with a robust method based on super twisting algorithms

Electrical engineering & Electromechanics, 2021
Aim. This paper presents the minimization of reactive and active power ripples of doubly fed induction generators using super twisting algorithms and pulse width modulation based on neuro-fuzzy algorithms. Method. The main role of the indirect active and
H. Benbouhenni, A. Driss, S. Lemdani
doaj   +1 more source