Glaze: Overlaying Occupied Spectrum with Downlink IoT Transmissions
summary
Glaze overlays a low-rate downlink channel on occupied TV, FM or Wi‑Fi by plugging a module into a radio antenna port and introducing small attenuation perturbations (0 = attenuation, 1 = no change). The system bundles a signal detector, parameter optimizer, a traffic predictor (two‑state Markov) and an embedder; the receiver uses a passive envelope detector, an RC dynamic threshold and a low‑power MCU. Prototype uses SDRs and a custom PCB; PESQ stays high until about -70 to -75 dBm and 10 kbps BER shows ~4 m for Wi‑Fi and ~10 m for FM/TV in tests (estimated FM/TV ranges 125 km / 75 km).
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