Exploiting Digital Micro-Mirror Devices for Ambient Light Communication
Talkat 19th USENIX Symposium on Networked Systems Design and Implementation (NSDI '22) · 2022-04-04..04-06·
summary
Describes an optical model and a working prototype, the PhotoLink platform, that swaps LCD shutters for digital micro-mirror devices (DMDs) and an FPGA controller to push switching from ~150 Hz to kHz. Benchmarks use a flashlight and photodiodes: DMDs hit 30 kbps over 6 m (vs. 1 kbps for equal-area LCD) and 80 kbps with a higher-bandwidth receiver, while consuming <50 mW; compared to a 500x larger multi-cell LCD, DMDs reach 80 kbps vs. 8 kbps.
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