Effectiveness of Time-Warping in Signal Reconstruction from Nonuniformly Distributed Level-Crossing Samples

Authors: J. Königs, C. Bockelmann, A. Dekorsy
Abstract:

The reconstruction of bandlimited signals from nonuniform samples remains a key challenge in modern signal processing, particularly for variable bandwidth (VBW) signals. Level-crossing (LC) sampling, a practical event-based sampling technique, adapts the sampling rate to the instantaneous bandwidth of a signal, but the inherent irregular sample spacing complicates signal reconstruction. In this paper, we analyze the effectiveness of time-warping in improving the sample spacing of LC samples for VBW signals and its impact on minimum energy (ME) reconstruction. By time-warping LC samples, we demonstrate a reduction in sample spacing variability, leading to a more stable reconstruction process. We evaluate the sample spacing distribution before and after time-warping and compare the reconstruction performance of ME reconstruction with and without time-warping. Numerical results show that time-warping significantly enhances reconstruction accuracy, reducing the numerical instability of the ME method. This study highlights the potential of time-warping as an effective preprocessing step for LC sampled VBW signals.

Document type: Conference Paper
Publication: Wien, Austria, 28. July - 1. August 2025
Conference: Sampling Theory and Applications (SampTA)
Files:
Effectiveness of Time-Warping in Signal Reconstruction from Nonuniformly Distributed Level-Crossing Samples
78_Effectiveness_of_Time_Warpi.pdf263 KB
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Last change on 21.08.2025 by J. Königs
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