Unsupervised Domain Adaptation for WiFi Gesture Recognition

Abstract

Human gesture recognition with WiFi signals has attained acclaim due to the omnipresence, privacy protection, and broad coverage nature of WiFi signals. These gesture recognition systems rely on neural networks trained with a large number of labeled data. However, the recognition model trained with data under certain conditions would suffer from significant performance degradation when applied in practical deployment, which limits the application of gesture recognition systems. In this paper, we propose UDAWiGR, an unsupervised domain adaptation framework for WiFi-based gesture recognition aiming to enhance the performance of the recognition model in new conditions by making effective use of the unlabeled data from new conditions. We first propose a pseudo-labeling method with confidence control constraint to utilize unlabeled data for model training. We then utilize consistency regularization to align the output distribution for enhancing the robustness of neural network under signal perturbations. Furthermore, we propose a cross-match loss to combine the pseudo-labeling and consistency regularization, which makes the whole framework simple yet effective. Extensive experiments demonstrate that the proposed framework could achieve 4.35% accuracy improvement comparing with the state-of-the-art methods on public dataset.