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arXiv · 2601.11351

Modulation, ISI, and Detection for Langmuir Adsorption-Based Microfluidic Molecular Communication

Ruifeng Zheng·Pengjie Zhou·Pit Hofmann·Martín Schottlender·Fatima Rani·Juan A. Cabrera·Frank H. P. Fitzek
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Abstract

This paper studies microfluidic molecular communication receivers with finite-capacity Langmuir adsorption driven by an effective surface concentration. In the reaction-limited regime, we derive a closed-form single-pulse response kernel and a symbol-rate recursion for on-off keying that explicitly exposes channel memory and inter-symbol interference. We further develop short-pulse and long-pulse approximations, revealing an interference asymmetry in the long-pulse regime due to saturation. To account for stochasticity, we adopt a finite-receptor binomial counting model, employ pulse-end sampling, and propose a low-complexity midpoint-threshold detector that reduces to a fixed threshold when interference is negligible. Numerical results corroborate the proposed characterization and quantify detection performance versus pulse and symbol durations.

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Ruifeng Zheng, Pengjie Zhou, Pit Hofmann, Martín Schottlender, Fatima Rani, Juan A. Cabrera, Frank H. P. Fitzek. 2026-01-16. Modulation, ISI, and Detection for Langmuir Adsorption-Based Microfluidic Molecular Communication. https://arxiv.org/abs/2601.11351

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