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Abstract:Monitoring respiratory health with the use of channel state information (CSI) has shown promising results. Many existing methods focus on monitoring only the respiratory rate, while others focus on monitoring the motion of the chest as a patient breathes, which is referred to as the respiratory waveform. This paper presents WiRM, a two-staged approach to contactless respiration monitoring. In the first stage, WiRM improves upon existing respiratory rate estimation techniques by using conjugate multiplication for phase sanitisation and the adaptive multi-trace carving (AMTC) algorithm for tracing how the respiratory rate changes over time. When compared against four state-of-the-art methods, WiRM has achieved an average reduction of 34.7% in respiratory rate root mean squared error (RMSE). In the second stage, WiRM uses this improved respiratory rate estimate to inform the decomposition and selection of the respiratory waveform from the CSI data. WiRM delivers a 7.9% improvement in average absolute correlation with the ground truth respiratory waveform. Within the literature, it is difficult to compare the robustness of existing algorithms in noisy environments. In this paper, we develop a purpose-built simulation toolkit to evaluate the robustness of respiration monitoring solutions under ambient motion interference and various noise conditions, including thermal, multiplicative, and phase noise. Our results show that WiRM demonstrates improved or comparable resilience to these common noise sources and interference scenario.

Submission history

From: James Rhodes [view email]
[v1] Thu, 31 Jul 2025 10:46:56 UTC (3,172 KB)
[v2] Wed, 22 Jul 2026 01:43:59 UTC (1,734 KB)