Diffusion-based Surrogate Model for Time-varying Underwater Acoustic Channels
This work addresses the challenge of accurate and generalizable channel modeling for underwater communication systems, offering a practical solution that improves upon conventional physics models and stochastic replay methods.
The paper tackled the problem of modeling time-varying underwater acoustic channels, which is crucial for reliable underwater communication systems, by proposing StableUASim, a pre-trained conditional latent diffusion surrogate model that accurately reproduces key channel characteristics and communication performance, enabling scalable and data-efficient applications.
Accurate modeling of time-varying underwater acoustic channels is essential for the design, evaluation, and deployment of reliable underwater communication systems. Conventional physics models require detailed environmental knowledge, while stochastic replay methods are constrained by the limited diversity of measured channels and often fail to generalize to unseen scenarios, reducing their practical applicability. To address these challenges, we propose StableUASim, a pre-trained conditional latent diffusion surrogate model that captures the stochastic dynamics of underwater acoustic communication channels. Leveraging generative modeling, StableUASim produces diverse and statistically realistic channel realizations, while supporting conditional generation from specific measurement samples. Pre-training enables rapid adaptation to new environments using minimal additional data, and the autoencoder latent representation facilitates efficient channel analysis and compression. Experimental results demonstrate that StableUASim accurately reproduces key channel characteristics and communication performance, providing a scalable, data-efficient, and physically consistent surrogate model for both system design and machine learning-driven underwater applications.