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In this paper, the wireless hierarchical federated learning (HFL) isrevisited by considering physical layer security (PLS). First, we establish aframework for this new problem. Then, we propose a practical finite blocklength(FBL) coding scheme for the wireless HFL in the presence of PLS, which isself-secure when the coding blocklength is lager than a certain threshold.Finally, the study of this paper is further explained via numerical examplesand simulation results.

A Finite Blocklength Approach for Wireless Hierarchical Federated Learning in the Presence of Physical Layer Security