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Four-dimensional parameter estimation of plane waves using swarming intelligence

Chinese Physics B 2014年第7期23卷 754-761页

作者： Fawad Zaman Ijaz Mansoor Qureshi Fahad Munir Zafar Ullah Khan Department of Electronic Engineering Faculty of Engineering and Technology International Islamic University Sector H-10 Department of Electrical Engineering Air University

This paper proposes an efficient approach for four-dimensional （4D） parameter estimation of plane waves impinging on a 2-L shape array. The 4D parameters include amplitude, frequency and the two-dimensional （2D） direction of arrival, namely, azimuth and elevation angles. The proposed approach is based on memetic computation, in which the global optimizer, particle swarm optimization is hybridized with a rapid local search technique, pattern search. For this purpose, a new multi-objective fitness function is used. This fitness function is the combination of mean square error and the correlation between the normalized desired and estimated vectors. The proposed hybrid scheme is not only compared with individual performances of particle swarm optimization and pattern search, but also with the performance of the hybrid genetic algorithm and that of the traditional approach. A large number of Monte-Carlo simulations are carried out to validate the performance of the proposed scheme. It gives promising results in terms of estimation accuracy, convergence rate, proximity effect and robustness against noise.

关键词： amplitude estimation direction of arrival estimation frequency estimation genetic algorithm

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Correlation method estimation of the modulation signal in the weak equivalence principle test

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Chinese Physics B 2018年第8期27卷 136-142页

作者： Jie Luo Liang-Cheng Shen Cheng-Gang Shao Qi Liu Hui-Jie Zhang School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China MOE Key Laboratory of Fundamental Physical Quantities Measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsSchool of PhysicsHuazhong University of Science and TechnologyWuhan 430074China TIANQIN Research Center for Gravitational Physics School of Physics and AstronomySun Yat-sen UniversityZhuhai 519082China

In a test of the weak equivalence principle （WEP） with a rotating torsion pendulum, it is important to estimate the amplitude of the modulation signal with high precision. We use a torsional filter to remove the free oscillation signal and employ the correlation method to estimate the amplitude of the modulation signal. The data analysis of an experiment shows that the uncertainties of amplitude components of the modulation signal obtained by the correlation method are in agreement with those due to white noise. The power spectral density of the modulation signal obtained by the correlation method is about one order higher than the thermal noise limit. It indicates that the correlation method is an effective way to estimate the amplitude of the modulation signal and it is instructive to conduct a high-accuracy WEP test.

关键词： weak equivalence principle test correlation method amplitude estimation thermal noise limit

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The Scalar Photon Light-Cone Distribution amplitude in the Instanton Vacuum Model of QCD

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Chinese Physics Letters 2014年第4期31卷 22-25页

作者： MO Xin LIU Jue-Ping Department of PhysiCs School of Physics Science and Technology Wuhan University Wuhan 430072

Based on the principle of the Lorentz covariance, the transition matrix elements from an off-shell photon state to the vacuum are parameterized by the light-cone photon distribution amplitudes （DAs）. Both the scalar off-shell photon light-cone DA and the corresponding coupling are calculated in the instanton vacuum model of quantum chromodynamics （QCD）, and their explicit analytical expressions and the numerical results are given. The results for the other chiral-odd light-cone photon DAs and their couplings are presented as well.

关键词： SCALAR field theory LIGHT cones amplitude estimation INSTANTONS QUANTUM chromodynamics ENANTIOSELECTIVE catalysis

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Lossless Selection Combining Without Channel State Information

Lossless Selection Combining Without Channel State Informati...

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2008 IEEE International Conference on Communications(ICC 2008)

作者： Young Gil Kim Norman C.Beaulieu Dept.of Electrical and Computer Engineering University of Seoul SeoulKorea 130-743 Dept.of Electrical and Computer Engineering University of Alberta Edmonton AlbertaCanada T6G 2G7

A signal-plus-noise （S+N ） energy selection combining （S+N-ESC） scheme for binary phase shift keying （BPSK） signaling is proposed. The S+N-ESC selects the branch with the maximum S+N energy for detection. The advantage of the S+N-ESC is that it requires no channel estimation for diversity branch selection. The bit error rate （BER） performance of the S+N-ESC is analyzed for BPSK signaling in independent and identically distributed （i.i.d.） Rayleigh fading channels. We show that the performance of the S+N-ESC is the same as conventional signal-to-noise ratio selection combining （SNR-SC）,which requires estimation of the fading amplitudes for branch selection.

关键词： Diversity reception Channel state information Binary phase shift keying Bit error rate Channel estimation Signal analysis Performance analysis Fading Signal to noise ratio amplitude estimation

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The Influential Factors and Charactristics of Triassic Yanchang Formation Reservior in the Zichang Delta,Ordos Basin,China

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 194-194页

作者： LI Airong WU Fuli ZHAO Liang ZHANG Lushe Xi'an Shiyou University Xi'an Shaanxi 710054 Yangchang Petroleum (Group) Co.LTD Yan'an Shaanxi 716000

Based on the theory of sedimentary petrology, mineral petrology, reservoir geology, well logging geology, exploitation geology and petroleum geology, and reservoir engineering, in combination with outcrop, core, thin section, scanning electron microscope, mercury intrusion and X-ray et al, this paper discussed the characteristics of the low penetrability reservoir of Chang 2 member and the ultra- low penetrability reservoir of Chang 6 member of the Zichang oilfield in the east of Shanbei slope.

关键词： RESERVOIRS OIL fields amplitude estimation STRUCTURAL geology BASINS (Geology) CHINA

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