sim-object · 1 TX, 3 RX (PiW3D layout) — each packet fans out and is heard by all receivers
incident (TX → object)
scattered (object → RX)
static multipath (walls only)
→
CSI · 60 × 180 flat spectrogram — 9 links (3 Rx × 3 ant) × 20 packets
rows: 30 amplitude + 30 sanitized-phase subcarriers · columns: Rx-major link blocks, 20 packets each