Update README.md

Lizz-2023 · Apr 10, 2021 · ef4178b · ef4178b
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 |21|[Passive Beamforming and Information Transfer via Large Intelligent Surface](https://github.com/Yuan-Xiaojun/Matlab_SIMO)|W. Yan, etal.|
 |22|[Deep Channel Learning For Large Intelligent Surfaces Aided mm-Wave Massive MIMO Systems](https://github.com/meuseabe/deepChannelLearning4RIS)|A. M. Elbir, etal.|
 |23|[Matrix-calibration-based cascaded channel estimation for reconfigurable intelligent surface assisted multiuser MIMO](https://github.com/liuhang1994/Matrix-Calibration-Based-Cascaded-Channel-Estimation)|Hang Liu, etal.|
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+|24|[Reconfigurable-Intelligent-Surface Empowered Wireless Communications: Challenges and Opportunities](https://github.com/liuhang1994/RIS_Rate_VS_Channel_Error)|Hang Liu, etal.|
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