Introduction
Time synchronization is a major challenge across various sectors, including broadcasting, telecommunications, and embedded systems. In this context, Wi-Wi, a Japanese wireless synchronization protocol, stands out as a game-changer. Utilizing Wireless 2Way Interferometry, Wi-Wi promises time synchronization with nanosecond precision.
Wi-Wi Technology: A Technological Leap
Wi-Wi operates on the 900 MHz frequency band, offering picosecond-level time synchronization and millimeter-level distance accuracy. Current prototypes exhibit 20 picoseconds of phase synchronization jitter and time synchronization down to 30 nanoseconds. Future improvements are expected to achieve 5-nanosecond precision in real-world conditions.
Practical Applications
At NAB 2026, Wi-Wi was demonstrated in two practical applications. The first involved wireless black burst time synchronization for remote video cameras. The second demonstration showcased millimeter-level positioning accuracy with a shell game using three Wi-Wi units.
Advantages and Limitations
Using the 900 MHz band allows for better signal penetration compared to GNSS, especially indoors or in environments where wiring is expensive. The system offers a wireless range of 0.2 to 5 km depending on RF power.
However, despite its advantages, Wi-Wi faces challenges, particularly the need for precise oscillators to maintain nanosecond-level synchronization, making it unsuitable for standard WiFi setups.
Implications for the Industry
With the growing adoption of standards like SMPTE 2110 in the broadcasting industry, Wi-Wi could become a key player for applications requiring precise synchronization. Additionally, companies like Ubiquiti are beginning to explore this technology, which could accelerate its adoption.
Conclusion
Wi-Wi represents immense potential for industries requiring ultra-precise time synchronization. Although still in development, this technology could transform how we approach wireless synchronization.
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