Abstract
This paper proposes frequency diversity (FD) reception for narrowband (NB) primary synchronization signal (NPSS) and narrowband secondary synchronization signal (NSSS) in order to improve the physical-layer cell identity (PCID) detection probability for NB-Internet-of-Things (IoT) communications. In the proposed FD reception, a user equipment receives the NPSS and NSSS in a radio frame alternately in time domain by switching the received NPSS and NSSS each those are transmitted from different resource blocks in the same frequency band. Link-level simulation results show that the PCID detection probability using FD reception is improved by approximately 16% compared to that without FD reception using the FD separation of four resource blocks with single antenna transmission. These results suggest that the average time for computing the cost functions of the NPSS is decreased to approximately 1/3 that without FD reception for detecting the NPSS received timing. We also show that the PCID detection probabilities of 90% and 97% are achieved using FD reception with precoding vector switching (PVS) transmit diversity at the average received signal-to-noise power ratio of 0 dB for the case with the maximum frequency offset of 70 kHz and that without considering frequency offset, respectively.
Published Version
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