Narrowband Internet of Things: Repetition-Based Coverage Performance Analysis of Uplink Systems - Volume 13, No. 6, June 2018 - Journal of Communications

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Narrowband Internet of Things: Repetition-Based Coverage Performance Analysis of Uplink Systems

Md Sadek Ali, Yu Li, Song Chen, and Fujiang Lin
Micro-/Nano-Electronic System Integration R&D Center (MESIC), Department of Electronic Science and Technology, University of Science and Technology of China (USTC), Hefei, Anhui, 230027, PR China
Abstract—A novel narrowband and low-power wide area network (LPWAN) technology named Narrowband Internet of Things (NB-IoT) based on Long Term Evolution (LTE) has been standardized by 3rd Generation Partnership Project (3GPP) in Release-13 to provide massive connectivity for Internet of Things (IoT). In NB-IoT systems, repeating same signal over additional period of time has been taken as a key technique to enhance radio coverage up to 20 dB compared to the legacy General Packet Radio Service (GPRS). NB-IoT system modeling and optimization of system performance is still challenging particularly coverage improvement in the case of practical applications. In this paper, we develop a repetitiondominated system model and evaluate the link-level coverage performance of NB-IoT uplink systems. Coverage performance based on signal repetition is also depended on the channel estimation accuracy. Besides, narrowband demodulation reference signal (NDMRS) assisted channel estimation and frequency-domain equalization are exploited on the receiver
side. Link-level extensive simulations are performed to validate the uplink coverage performance for both single-tone and multitone transmissions. The results show that our proposed system model with repetition-dominated approach guarantees the transmission reliability in worse channel conditions of NB-IoT uplink systems as well as enhance the radio coverage.


Index Terms—Least Square (LS) estimation, Machine-to-Machine (M2M) communications, narrowband internet of things (NB-IoT), Resource Unit (RU), repetitions, Single Carrier Frequency Division Multiple Access (SC-FDMA), Zero Forcing (ZF) equalization.


Cite: Md Sadek Ali, Yu Li, Song Chen, and Fujiang Lin,     " Narrowband Internet of Things: Repetition-Based Coverage Performance Analysis of Uplink Systems, vol. 13, no. 6, pp. 293-302 2018. Doi: 10.12720/jcm.13.6. 293-302.
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