RFClock: timing, phase and frequency synchronization for distributed wireless networks
RFClock: timing, phase and frequency synchronization for distributed wireless networks
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RFClock：分布式无线网络的定时、相位和频率同步
DOI：
10.1145/3447993.3448623
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Chowdhury, Kaushik
中科院分区：
文献类型：
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作者：
Alemdar, Kubra;Varshney, Divashree;Mohanti, Subhramoy;Muncuk, Ufuk;Chowdhury, Kaushik
分布式协调波束形成（DCB）、智能反射器阵列和联网机器人设备等新兴应用将改变无线应用。然而，对于这些主题的以系统为中心的工作，研究界必须首先克服实现细粒度的空中定时同步的障碍，这对于任何协调操作都是至关重要的。为了解决这一差距，本文提出了一个开源的设计和实现的“RFClock”，提供定时，频率和相位同步的软件定义的无线电（SDR）。它展示了如何将RFClock用于实际的5节点DCB应用，而无需修改现有的物理/链路层协议。RFClock-leader采用leader-follower结构，允许跟随时钟与0.107Hz以下的平均偏移同步，然后将时间/相位对准校正到5 ns偏差以内。RFClock设计用于通用环境：作为独立单元，它生成适用于当今大多数商用现成（COTS）SDR的10 MHz/1 PPS信号参考;它不需要自定义特定于协议的报头或消息;并且通过频率捷变操作对干扰具有鲁棒性。使用RFClock的DCB，我们验证了显着增加的信道增益和低误码率在[0 - 10--3]的范围内为不同的调制方案。我们还展示了类似于流行的有线解决方案的性能，以及对基于GPS的解决方案的显著改进，同时以低廉的价格/功率点提供此功能。
Emerging applications like distributed coordinated beamforming (DCB), intelligent reflector arrays, and networked robotic devices will transform wireless applications. However, for systems-centric work on these topics, the research community must first overcome the hurdle of implementing fine-grained, over-the-air timing synchronization, which is critical for any coordinated operation. To address this gap, this paper presents an open-source design and implementation of 'RFClock' that provides timing, frequency and phase synchronization for software defined radios (SDRs). It shows how RFClock can be used for a practical, 5-node DCB application without modifying existing physical/link layer protocols. By utilizing a leader-follower architecture, RFClock-leader allows follower clocks to synchronize with mean offset under 0.107Hz, and then corrects the time/phase alignment to be within a 5ns deviation. RFClock is designed to operate in generalized environments: as standalone unit, it generates a 10MHz/1PPS signal reference suitable for most commercial-off-the-shelf (COTS) SDRs today; it does not require custom protocol-specific headers or messaging; and it is robust to interference through a frequency-agile operation. Using RFClock for DCB, we verify significant increase in channel gain and low BER in a range of [0 -- 10--3] for different modulation schemes. We also demonstrate performance that is similar to a popular wired solution and significant improvement over a GPS-based solution, while delivering this functionality at a fractional price/power point.
DOI：
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发表时间：
2019
期刊：
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影响因子：
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作者：
Zhuqi Li;Yaxiong Xie;Longfei Shangguan;R. I. Zelaya;J. Gummeson;Wenjun Hu;Kyle Jamieson
通讯作者：
Zhuqi Li;Yaxiong Xie;Longfei Shangguan;R. I. Zelaya;J. Gummeson;Wenjun Hu;Kyle Jamieson
DOI：
10.1145/3131348.3131349
发表时间：
2017-10
期刊：
Proceedings of the 9th ACM Workshop on Wireless of the Students, by the Students, and for the Students
影响因子：
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作者：
D. Nguyen;Anton Paatelma;H. Saarnisaari;Nagarajan Kandasamy;K. Dandekar
通讯作者：
D. Nguyen;Anton Paatelma;H. Saarnisaari;Nagarajan Kandasamy;K. Dandekar
通过 4 公里自由空间链路实现飞秒级光双向时间同步
DOI：
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发表时间：
2015
期刊：
影响因子：
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作者：
J. Deschênes;L. Sinclair;F. Giorgetta;W. Swann;E. Baumann;I. Coddington;N. Newbury
通讯作者：
N. Newbury