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• W4313169670 abstract "Reconfigurable intelligent surface (RIS) can effectively improve the performance of 6G communication systems by providing additional LoS paths. Although the beam alignment is necessary in 6G communication system due to the user mobility, the deployment of RIS increases significantly the complexity of beam tracking, making it impractical to apply directly conventional schemes. To this end, we study a time-varying RIS-aided millimeter wave (mmWave) system, a robust complex-valued extended Kalman filter method is proposed to tackle the beam alignment problem. More specifically, the proposed scheme achieves 17% performance gain compared to conventional training-based method. The impact of the number of RIS elements is investigated, there exists corresponding optimal number of RIS elements in terms of the minimum of the mean square error of the estimated beam angle. A simple but efficient algorithm to obtain the optimal number of RIS elements is presented. Simulation results demonstrate that, by employing the RIS in mmWave communication systems, the performance of beam tracking can be enhanced by <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$mathbf {37%}$</tex-math></inline-formula> with proposed algorithms." @default.
• W4313169670 created "2023-01-06" @default.
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• W4313169670 date "2023-02-01" @default.
• W4313169670 modified "2023-10-14" @default.
• W4313169670 title "RIS-Aided 6G Communication System With Accurate Traceable User Mobility" @default.
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• W4313169670 doi "https://doi.org/10.1109/tvt.2022.3214818" @default.
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