Experimental Demonstration of Nanosecond Accuracy Wireless Network Synchronization

面向光数据中心网络的纳秒级精确时间同步

Nanosecond Precision Time Synchronization for Optical Data Center Networks

本文提出首个面向光数据中心网络的纳秒级同步方案NOS，通过在动态光电路上构建时钟传播树、预测漂移并定制同步协议，在192个ToR场景下实现28纳秒同步精度。

Nanoseconds Timing System Based on IEEE 1588 FPGA Implementation

Clock synchronization procedures are mandatory in most physical experiments where event fragments are readout by spatially dislocated sensors and must be glued together to reconstruct key parameters (e.g. energy, interaction vertex etc.) of the process under investigation. These distributed data readout topologies rely on an accurate time information available at the frontend, where raw data are acquired and tagged with a precise timestamp prior to data buffering and central data collecting. This makes the network complexity and latency, between frontend and backend electronics, negligible wit…

Scalable and Passive Wireless Network Clock Synchronization

Clock synchronization is ubiquitous in wireless systems for communication, sensing and control. In this paper we design a scalable system in which an indefinite number of passively receiving wireless units can synchronize to a single master clock at the level of discrete clock ticks. Accurate synchronization requires an estimate of the node positions. If such information is available the framework developed here takes position uncertainties into account. In the absence of such information we propose a mechanism which enables simultaneous synchronization and positioning. Furthermore we derive t…

Revisiting Time, Clocks, and Synchronization

Sub-nanosecond precision clock synchronization over the packet network has been achieved by the White Rabbit protocol for a decade. However, few computer systems utilize such a technique. We try to attract more interest in the clock synchronization problem. We first introduce the basics of clock and synchronization in the time and frequency discipline. Then we revisit several related works, such as Google's Spanner, Huygens, FARMv2, DTP, and Sundial, explain why these works could be improved. Finally, we briefly discuss an independent time network approach towards low-cost and high-precision s…

AB-Sync: 基于注意力的时隙级时钟同步方法用于UWB-TDOA定位网络

AB-Sync: Attention-Based Slot-Level Clock Synchronization Method for UWB-TDOA Localization Networks

针对UWB-TDOA定位网络中同步粒度不匹配导致的残余TDOA误差，提出基于注意力的时隙级时钟同步方法AB-Sync，通过建模时隙特定时钟速度比与相邻时钟波动的关系，实现标签时隙级时间戳映射，无需额外同步消息，显著降低TDOA测距标准差并提升定位精度。

Experimental Demonstration of Delay-Bounded Wireless Network Based on Precise Time Synchronization

Low latency and reliable information transfer are highly demanded in fifth generation (5G) and beyond 5G wireless communications. A novel delay-bounded wireless media access control (MAC) protocol called Carrier Sense Multiple Access with Arbitration Point (CSMA/AP) was established to strictly ensure the upper boundary of communication delay. CSMA/AP enables collision-free and delay-bounded communications with a simple arbitration mechanism exploiting the precise time synchronization achieved by Wireless Two-Way Interferometry (Wi-Wi). Experimental demonstration and proving the feasibility in …