Implementation and Performance Evaluation of Cellular NB-IoT OTDOA Positioning

Mauro Salomon, Stefan Lippuner, Matthias Korb, Qiuting Huang

Peer Reviewed

Abstract:	Abstract—This contribution describes the first implementation of an integrated modem supporting NB-IoT OTDOA positioning. The integration of a dedicated hardware accelerator provides the necessary processing power for time-domain cross-correlations of OFDM signals and enables successful position fixes at highly negative SINR. The presented HW/SW partitioning scheme allows to minimize the HW overhead, keeping it below 2% of the System on Chip (SoC)’s area, while allowing for flexible algorithms taking advantage of the integrated processor system. Measurements with fabricated silicon in a laboratory environment prove that 3GPP accuracy requirements are easily met. The achieved Root Mean Square (RMS) positioning accuracy of 48.5 m and 65.5 m in normal and extended coverage, respectively, shows the potential of NB-IoT positioning as a complement to GNSS. Potential use cases are indoor applications and the improvement of cyber-physical systems’ security by adding redundancy to their positioning capabilities.
Published in:	2020 IEEE/ION Position, Location and Navigation Symposium (PLANS) April 20 - 23, 2020 Hilton Portland Downtown Portland, Oregon
Pages:	1365 - 1371
Cite this article:	Salomon, Mauro, Lippuner, Stefan, Korb, Matthias, Huang, Qiuting, "Implementation and Performance Evaluation of Cellular NB-IoT OTDOA Positioning," 2020 IEEE/ION Position, Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020, pp. 1365-1371. https://doi.org/10.1109/PLANS46316.2020.9109877
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