A Coarse Timing Synchronization Method of Low SNR OFDM Systems for IoT

In this paper, the problem of coarse timing synchronization of low signal-to-noise radio (SNR) wireless orthogonal frequency-division-multiplexing systems (OFDM) for Internet of Things (IoT) is investigated. When OFDM is applied in IoT scenarios, the system needs to work at quite low SNR to achieve extended coverage. The proposed coarse synchronization method can response efficiently to the aforementioned challenge with a noise-eliminated timing metric. The simulation results of detection failure probability at different SNRs and number of processed frames indicate that significant performance improvement is obtained with the proposed scheme.