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Sensors 2018, 18(11), 4077;

Frequency Offset Tolerant Synchronization Signal Design in NB-IoT

Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China
Author to whom correspondence should be addressed.
Received: 12 October 2018 / Revised: 13 November 2018 / Accepted: 15 November 2018 / Published: 21 November 2018
(This article belongs to the Section Internet of Things)
PDF [2535 KB, uploaded 22 November 2018]


Timing detection is the first step and very important in wireless communication systems. Timing detection performance is usually affected by the frequency offset. Therefore, it is a challenge to design the synchronization signal in massive narrowband Internet of Things (NB-IoT) scenarios where the frequency offset is usually large due to the low cost requirement. In this paper, we firstly proposed a new general synchronization signal structure with a couple of sequences which are conjugated to remove the potential timing error that arises from large frequency offset. Then, we analyze the suitable sequence for our proposed synchronization signal structure and discuss a Zadoff–Chu (ZC) sequence with root 1 as an example. Finally, the simulation results demonstrate that our proposed synchronization signal can work well when the frequency offset is large. It means that our proposed synchronization signal design is very suitable for the massive NB-IoT. View Full-Text
Keywords: Internet of Things; synchronization signal; timing detection; large frequency offset Internet of Things; synchronization signal; timing detection; large frequency offset

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Zou, J.; Xu, C. Frequency Offset Tolerant Synchronization Signal Design in NB-IoT. Sensors 2018, 18, 4077.

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