Real-Time Parameter Optimization of LoRa for LEO Satellite Communication

Internet of Things (IoT) based on LEO satellites has become a competitive solution for extending the coverage area of LPWAN, meanwhile commercial off-the-shelf (COTS) devices/chips applied to LEO satellites can dramatically decrease the cost. Thus, commercial off-the-shelf LoRa chip used for Internet of Things(IoT) LEO satellite communication transceiver is a promising application scenario. In this paper, the influence of the Doppler effect on symbol detection performance is examined for COTS LoRa chip applied to LEO satellites. Transceiver parameters such as bandwidth, spreading factor, and frame length are optimized to overcome the Doppler effect, and a desirable transmission scenario for such LEO satellite communication system is also presented. Theoretical analysis and simulation results show that much wider bandwidth with the smaller spreading factor and frame length of a transceiver corresponds to stronger immunity to Doppler effect when COTS LoRa chip exploited in LEO satellite.