Brownian Bridge Diffusion-Based Joint Channel Estimation and Data Detection for Jamming-Resilient Receivers

2026-06-27

AI Summary

This work addresses the challenge of joint channel estimation and data detection in dense wireless environments where time-frequency overlap caused by limited spectrum severely degrades conventional receiver performance. To mitigate this, we propose the Brownian Bridge Diffusion-based Joint Channel Estimation and Data Detection (BBD-JCED) framework, which introduces, for the first time, a Brownian bridge diffusion process into interference-resilient communications. By extracting and suppressing interference characteristics in the short-time Fourier transform (STFT) domain, BBD-JCED enhances the signal-to-joint-noise ratio (SJNR) while explicitly modeling the dynamic evolution of both signals and bits. A fast ODE solver is integrated to reduce computational complexity, and a multi-module cooperative training strategy is devised to improve data recovery accuracy. Compared to baseline methods, BBD-JCED achieves significantly better bit detection performance with fewer parameters and comparable computational overhead.

Abstract

In next-generation wireless networks, the growing density of devices and limited spectrum resources pose severe jamming challenges to fragile legitimate communication links in the wireless electromagnetic environment. Crucially, when jamming overlaps with pilot and data symbols in both time and frequency domains, it inflicts a severe bottleneck on receiver-side joint estimation and detection. Existing schemes often lack an effective framework to combat such jamming contamination, thereby failing to guarantee reliable transmission. To address this issue, we propose a Brownian bridge diffusion-based joint channel estimation and data detection framework (BBD-JCED) for jamming-resilient receivers. Specifically, the proposed framework comprises two core modules: the first extracts jamming features in the short-time Fourier transform (STFT) domain and suppresses jamming samples, thereby improving the signal-to-jamming-plus-noise ratio (SJNR) of the received signal; the second introduces a Brownian bridge diffusion (BBD) process to model the evolution of the suppressed signal and the encoded bits in the presence of channel estimation errors, thereby enabling enhanced joint channel estimation and data detection. To alleviate the computational burden of the BBD process in the second module, we further derive a fast ordinary differential equation (ODE) solver that enables its low-complexity iterative evolution. Finally, we design a multi-module training algorithm to improve the data recovery capability of the proposed framework. Simulation results demonstrate that the proposed framework achieves superior bit recovery performance compared with baseline schemes while maintaining a lower number of model parameters and competitive computational complexity.

Problem

• jamming-resilient receivers
• joint channel estimation and data detection
• jamming contamination
• wireless electromagnetic environment
• signal-to-jamming-plus-noise ratio

Innovation

• Brownian bridge diffusion
• joint channel estimation and data detection
• jamming suppression
• STFT domain
• fast ODE solver