The paper proposes a data-driven approach to air-to-ground channel estimation
in a millimeter-wave wireless network on an unmanned aerial vehicle. Unlike
traditional centralized learning methods that are specific to certain
geographical areas and inappropriate for others, we propose a generalized model
that uses Federated Learning (FL) for channel estimation and can predict the
air-to-ground path loss between a low-altitude platform and a terrestrial
terminal. To this end, our proposed FL-based Generative Adversarial Network
(FL-GAN) is designed to function as a generative data model that can learn
different types of data distributions and generate realistic patterns from the
same distributions without requiring prior data analysis before the training
phase. To evaluate the effectiveness of the proposed model, we evaluate its
performance using Kullback-Leibler divergence (KL), and Wasserstein distance
between the synthetic data distribution generated by the model and the actual
data distribution. We also compare the proposed technique with other generative
models, such as FL-Variational Autoencoder (FL-VAE) and stand-alone VAE and GAN
models. The results of the study show that the synthetic data generated by
FL-GAN has the highest similarity in distribution with the real data. This
shows the effectiveness of the proposed approach in generating data-driven
channel models that can be used in different regions

该研究提出了一种基于数据驱动的、利用联邦学习（FL）和生成对抗网络（GAN）的方法，用于在无人机上的毫米波无线网络中进行空地信道估计。通过将 FL-GAN 与其他生成模型进行比较，结果表明，FL-GAN 所生成的合成数据分布与真实数据的相似度最高，有效地展示了该方法在生成数据驱动的信道模型方面的实用性。