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    "story_id": "mp-2026-11-05-010",
    "source_story_id": "tmp-story-wall-reflected-mobility",
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    "headline": "The Wall Reflection Becomes a Walking Sensor",
    "slug": "the-wall-reflection-becomes-a-walking-sensor",
    "dek": "A fixed 60.8-gigahertz communication link classifies pace and direction from motion-shaped power fades without dedicated radar hardware.",
    "summary": "A fixed 60.8-gigahertz communication link classifies pace and direction from motion-shaped power fades without dedicated radar hardware.",
    "body_text": "Three participants made 144 perpendicular and diagonal crossings through a wall-reflected millimeter-wave link. Fade duration supplies walking-pace features, while asymmetry before and after the fade carries direction. Under leave-one-participant-out validation, logistic regression reaches 86.1 percent for binary pace, 79.2 percent for three pace classes and 77.1 percent for travel direction. The experiment uses continuous-tone signals and a small participant set, so it demonstrates feasibility rather than production-grade occupancy sensing.",
    "why_it_matters": "A fixed 60.8-gigahertz communication link classifies pace and direction from motion-shaped power fades without dedicated radar hardware.",
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    "tags": [
      "millimeter wave",
      "wireless sensing",
      "human mobility"
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      "source_id": "source-2026-11-05-010",
      "title": "arXiv preprint 2611.06900, original v1",
      "publisher": "arXiv",
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      "published_at": "2026-11-04T13:49:15.000-05:00",
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    "title": "The Wall Reflection Becomes a Walking Sensor",
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