Narrowband internet of things: analysis of frame structure, NPSS sequence generation and detection
by Rasveen; Khyati Chopra; Sandeep Kumar
International Journal of Systems, Control and Communications (IJSCC), Vol. 13, No. 1, 2022

Abstract: A new cellular technology named narrowband internet of things (NB-IoT) introduced in 3GPP Rel-13 provides wide-area coverage, deep penetration, long battery life and stable performance. The need of this novel technology is to make a rapid communication link, lower battery consumption and reduce the number of retransmissions. The primary requirement to achieve this is to reduce the time for searching the synchronisation signals. NB-IoT device has a random frequency offset which affects the narrowband primary synchronisation signal (NPSS) detection complexity. In this study we firstly, generated an NPSS sequence for which Zadoff-Chu (ZC) sequencing is used. Secondly, to minimise the complexity of NPSS detection, the proposed work performed coarse frequency and timing offset estimation on a received signal. Autocorrelation technique was used for the detection of NPSS. The simulation results showed that the proposed NPSS detection method reduced the search time for the synchronisation signal even when there is a large frequency offset.

Online publication date: Thu, 16-Dec-2021

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