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Your search keyword '"Zhou, Qun Yan"' showing total 28 results
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28 results on '"Zhou, Qun Yan"'

1. Rank Optimization for MIMO Channel with RIS: Simulation and Measurement

Author

Meng, Shengguo, Tang, Wankai, Chen, Weicong, Lan, Jifeng, Zhou, Qun Yan, Han, Yu, Li, Xiao, and Jin, Shi

Subjects
Computer Science - Information Theory, Electrical Engineering and Systems Science - Signal Processing
Abstract

Reconfigurable intelligent surface (RIS) is a promising technology that can reshape the electromagnetic environment in wireless networks, offering various possibilities for enhancing wireless channels. Motivated by this, we investigate the channel optimization for multiple-input multiple-output (MIMO) systems assisted by RIS. In this paper, an efficient RIS optimization method is proposed to enhance the effective rank of the MIMO channel for achievable rate improvement. Numerical results are presented to verify the effectiveness of RIS in improving MIMO channels. Additionally, we construct a 2$\times$2 RIS-assisted MIMO prototype to perform experimental measurements and validate the performance of our proposed algorithm. The results reveal a significant increase in effective rank and achievable rate for the RIS-assisted MIMO channel compared to the MIMO channel without RIS., Comment: This work has been accepted by IEEE WCL

Published
2023

9. Rank Optimization for MIMO Channel With RIS: Simulation and Measurement

Author

Meng, Shengguo, Tang, Wankai, Chen, Weicong, Lan, Jifeng, Zhou, Qun Yan, Han, Yu, Li, Xiao, and Jin, Shi

Abstract

Reconfigurable intelligent surface (RIS) is a promising technology that can reshape the electromagnetic environment in wireless networks, offering various possibilities for enhancing wireless channels. Motivated by this, we investigate the channel optimization for multiple-input multiple-output (MIMO) systems assisted by RIS. In this letter, an efficient RIS optimization method is proposed to enhance the effective rank of the MIMO channel for achievable rate improvement. Numerical results are presented to verify the effectiveness of RIS in improving MIMO channels. Additionally, we construct a $2\times 2$ RIS-assisted MIMO prototype to perform experimental measurements and validate the performance of our proposed algorithm. The results reveal a significant increase in effective rank and achievable rate for the RIS-assisted MIMO channel compared to the MIMO channel without RIS.

Published
2024
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19. A Single-Layered Wideband and Wide-Angle Transparent Metasurface for Enhancing the EM-Wave Transmissions Through Glass

Author

Jiang, Rui Zhe, Ma, Qian, Liang, Jing Cheng, Zhou, Qun Yan, Dai, Jun Yan, Cheng, Qiang, and Cui, Tie Jun

Abstract

High transmission of electromagnetic (EM) waves is closely related to the reliability and stability of the indoor-to-outdoor wireless communication system. Due to the serious EM attenuation of the normal glasses under large incident angles, transparent film coatings that can be attached to the glasses have attracted extensive attention to maintain high EM transmissions in a wide-angle range. In this article, a wideband and wide-angle single-layered transparent metasurface is proposed to enhance the EM transmissions through the glasses. Detailed mechanisms, analytical models, and elaborate numerical results are presented. As a proof-of-concept, a prototype of the metasurface based on Ag metal mesh (AMM) is fabricated and tested. The measured results are in good agreement with the numerical simulations and calculations, thus validating the excellent EM performance. It is expected that the proposed single-layered metasurface with high transmittance in both microwave and light bands can find potential applications in the 5G and 6G communication scenarios.

Published
2023
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28. [Construction of RegIα over-expression vector and its effect on proliferation and apoptosis of gastric cancer cells].

Author

Zhou QY, Lu XF, Wang LJ, and Si JM

Subjects
Cell Line, Tumor, Genetic Vectors, Humans, Stomach Neoplasms metabolism, Transfection, Apoptosis, Cell Proliferation, Plasmids genetics, Stomach Neoplasms pathology
Abstract

Objective: To construct RegIα over-expression vector and to evaluate the effect of RegIα on the proliferation and apoptosis of gastric cancer MKN28 cells in vitro., Methods: Full sequence of RegIα cDNA was amplified from normal gastric tissue samples by RT-PCR and cloned into pIRES2-EGFP vector. RT-PCR and Western blot were performed to detect expression levels of RegIα in MKN28 cells. The effects of over-expression RegIα on cell proliferation was measured by MTT assay and apoptosis was detected by flow cytometry., Result: RegIα cDNA over-expression vector of pIRES2-RegIα-EGFP was successfully constructed. The expressions of RegIα in MKN28 cells, including mRNA and protein levels, were significantly increased after stable transfection, which resulted in cell proliferation and anti-apoptotic effect induced by H(2)O(2)., Conclusion: The over-expression of RegIα can promote cell proliferation and reduce cell apoptosis when induced by H(2)O(2) in gastric cancer cells.

Published
2010
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