Deep learning has been widely applied for the channel state information (CSI) feedback in frequency division duplexing (FDD) massive multiple-input multiple-output (MIMO) system. For the typical supervised training of the feedback model, the requirements of large amounts of task-specific labeled data can hardly be satisfied, and the huge training costs and storage usage of the model in multiple scenarios are hindrance for model application. In this letter, a multi-task learning-based approach is proposed to improve the feasibility of the feedback network. An encoder-shared feedback architecture and the corresponding training scheme are further proposed to facilitate the implementation of the multi-task learning approach. The experimental results indicate that the proposed multi-task learning approach can achieve comprehensive feedback performance with considerable reduction of training cost and storage usage of the feedback model.
@article{arxiv.2204.12442,
title = {Multi-task Deep Neural Networks for Massive MIMO CSI Feedback},
author = {Boyuan Zhang and Haozhen Li and Xin Liang and Xinyu Gu and Lin Zhang},
journal= {arXiv preprint arXiv:2204.12442},
year = {2022}
}