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README.md

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 |31|[Reconfigurable intelligent surface enabled federated learning: A unified communication-learning design approach](https://github.com/liuhang1994/RIS-FL)|Hang Liu, etal.|
 |32|[Channel Estimation for Reconfigurable Intelligent Surface Aided Multi-User mmWave MIMO Systems](https://github.com/jayJieChen/ChannelEstimation-RIS-MUmmWAVe-MIMO-Systems)|Jiajie Chen, etal.|
 |33|[Reconfigurable Intelligent Surface for Enhanced Communication Techniques](https://github.com/saarthaksm29/Reconfigurable-Intelligent-Surface)|saarthaksm29|
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+|34|[Two-Timescale Channel Estimation for Reconfigurable Intelligent Surface Aided Wireless Communications](http://oa.ee.tsinghua.edu.cn/dailinglong/publications/code/Two-timescale%20channel%20estimation%20for%20reconfigurable%20intelligent%20surface%20aided%20wireless%20communications.zip)|Chen Hu, etal.|
+|35|[A joint precoding framework for wideband reconfigurable intelligent surface-aided cell-free network](http://oa.ee.tsinghua.edu.cn/dailinglong/publications/code/A%20joint%20precoding%20framework%20for%20wideband%20reconfigurable%20intelligent%20surface-aided%20cell-free%20network.zip)|Z. Zhang, etal.|
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