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Your search keyword '"Jian, Chunxiao"' showing total 23 results
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23 results on '"Jian, Chunxiao"'

19. Adaptive beamforming algorithm for coprime array based on interference and noise covariance matrix reconstruction.

Author

Du, Yuxi, Xu, Haiyun, Cui, Weijia, Jian, Chunxiao, and Zhang, Jian

Subjects
BEAMFORMING, SIGNAL processing, SIMULATION methods & models, INFORMATION measurement, SIGNAL theory
Abstract

Compared with the uniform linear array (ULA) under the same physical array element, the coprime array can obtain a higher degree of freedom and a larger array aperture, so it has received extensive attention from scholars in recent years. Based on the idea of interference plus noise covariance matrix (INCM) reconstruction, this study proposed a robust adaptive beamforming algorithm using the coprime array. In the virtual array generated by the coprime array, the authors prove from the perspective of virtual signals that the constructed Toeplitz matrix is equivalent to a virtual ULA with more array elements. Subsequently, a high‐resolution subspace algorithm is used to estimate the direction of arrival (DOA) of the signals, and the estimated DOA is used to reconstruct the direction vector (DV) of the coprime array. Through the eigenvalue decomposition of the reconstructed Toeplitz matrix, the corresponding relationship between the eigenvalue and the power is deduced, and the signals and noise power are estimated using the eigenvalue. Finally, combine the DV of the desired signal and the reconstructed INCM to calculate the weight vector of the proposed algorithm. The simulation results prove the superiority and effectiveness of the algorithm. [ABSTRACT FROM AUTHOR]

Published
2022
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21. A Resource Allocation Algorithm Combined with Optical Power Dynamic Allocation for Indoor Hybrid VLC and Wi-Fi Network

Author

Liu Luo-kun, Tian Wan, Jian Chunxiao, and Zhang Xia

Subjects
business.industry, Computer science, media_common.quotation_subject, Real-time computing, Visible light communication, Fidelity, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, 0203 mechanical engineering, Max-min fairness, Telecommunications link, 0202 electrical engineering, electronic engineering, information engineering, Resource allocation, Wireless, Resource management, business, Throughput (business), media_common, Computer network
Abstract

In indoor scenarios, visible light communication (VLC) access point (AP) can provide very high throughput and meet any illumination demands, while wireless fidelity (Wi-Fi) provides basic coverage in a large range. In this paper, the downlink resource allocation (RA) problem for hybrid VLC and Wi-Fi network is considered. A resource allocation algorithm combined with optical power dynamic allocation is proposed. The optimization goal is to maximize the Best Effort (BE) service users' aggregate throughput and users' proportional fairness under the premise of guaranteeing the minimum rate requirement of the Delay Constrained (DC) service users. Simulation results show that the algorithm we proposed is capable of achieving better performance in both aggregate throughput and individual fairness obviously when multi-user are extremely uneven distributed, compared with the algorithm under the condition of optical power average allocation.

Published
2016

22. Design and implementation of a novel C broadband phased-array antenna element

Author

Wei Peng, Liu Luo-kun, and Jian Chunxiao

Subjects
Engineering, Directional antenna, business.industry, Antenna measurement, Antenna tuner, law.invention, Antenna efficiency, Passive radiator, law, Electronic engineering, Dipole antenna, Antenna gain, Omnidirectional antenna, business, Computer Science::Information Theory
Abstract

Based on the requirement of phased-array antenna, a novel C broadband phased-array antenna element is designed and implemented. A new structure is applied: 4 cell antennas are combined through two-stage passive combiner, between which a band pass filter is added to restrain the out-of-band signals. Simulation and test data shows that the SWR is less than 1.5 within 22% of the band width, gain of the antenna element is more than 10dB, and the side-lobe is 12dB lower than the main lobe in directivity diagram of the E-plane. It is suitable for application of C broadband phased-array antennas.

Published
2016

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