At NAB, I found a demo of Wi-Wi STAMP, a wireless time synchronization protocol that came out of Japan's NICT.



Wi-Wi stands for Wireless 2Way interferometry, and it uses the 900 MHz band for picosecond-level time sync, and mm-level distance accuracy, in a tiny box, currently the size of a smartphone.
The system is still in development, but existing prototypes have 20ps of phase synchronization jitter, and time synchronization down to 30ns. The next generation will have time down to 5ns in real-world use.

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Wi-Wi STAMP is a wireless time synchronization protocol developed by Japan's NICT, using the 900 MHz band to achieve picosecond-level phase sync and nanosecond-level time accuracy. Current prototypes achieve 20ps phase jitter and 30ns time sync, with the next generation targeting 5ns. The system also provides millimeter-level positioning accuracy and has a wireless range of 0.2–5 km. Practical demos at NAB 2026 included wireless black burst sync for broadcast cameras and a shell game demonstrating mm-level position tracking. The technology is relevant to broadcast workflows adopting SMPTE 2110, AES67, and similar precision timing protocols.

Wi-Wi Is Wireless Time Sync at 1 nanosecond