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COMPUTATIONALLY EFFICIENT ESPRIT METHOD FOR DIRECTION FINDING 被引量:4
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作者 Bao Zhiqiang Wu Shunjun Zhang Linrang 《Journal of Electronics(China)》 2007年第5期655-661,共7页
In this paper,a low complexity ESPRIT algorithm based on power method and Orthogo- nal-triangular (QR) decomposition is presented for direction finding,which does not require a priori knowledge of source number and th... In this paper,a low complexity ESPRIT algorithm based on power method and Orthogo- nal-triangular (QR) decomposition is presented for direction finding,which does not require a priori knowledge of source number and the predetermined threshold (separates the signal and noise ei- gen-values).Firstly,according to the estimation of noise subspace obtained by the power method,a novel source number detection method without eigen-decomposition is proposed based on QR de- composition.Furthermore,the eigenvectors of signal subspace can be determined according to Q matrix and then the directions of signals could be computed by the ESPRIT algorithm.To determine the source number and subspace,the computation complexity of the proposed algorithm is approximated as (2log_2 n+2.67)M^3,where n is the power of covariance matrix and M is the number of array ele- ments.Compared with the Single Vector Decomposition (SVD) based algorithm,it has a substantial computational saving with the approximation performance.The simulation results demonstrate its effectiveness and robustness. 展开更多
关键词 ESPRIT Direction Of Arrival (DOA) Array signal processing Source number detection Power method
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Estimation of photon counting statistics with imperfect detectors
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作者 Xiao-Chuan Han Dong-Wei Zhuang +2 位作者 Yu-Xuan Li Jun-Feng Song Yong-Sheng Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期351-356,共6页
The study on photon counting statistics is of fundamental importance in quantum optics. We theoretically analyzed the imperfect detection of an arbitrary quantum state. We derived photon counting formulae for six typi... The study on photon counting statistics is of fundamental importance in quantum optics. We theoretically analyzed the imperfect detection of an arbitrary quantum state. We derived photon counting formulae for six typical quantum states (i.e., Fock, coherent, squeeze-vacuum, thermal, odd and even coherent states) with finite quantum efficiencies and dark counts based on multiple on/off detector arrays. We applied the formulae to the simulation of multiphoton number detections and obtained both the simulated and ideal photon number distributions of each state. A comparison between the results by using the fidelity and relative entropy was carried out to evaluate the detection scheme and help select detectors for different quantum states. 展开更多
关键词 FIDELITY on/off detector photon number detection relative entropy
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