Study of LoRa Performance at 433 MHz and 868 MHz Bands Inside a Multistory Building

摘要

LoRa wireless network has become a widely spread technology among IoT systems recently. LoRa allows to use various ISM bands such as 433 MHz, 868 MHz and 915 MHz. During this study 433 MHz and 868 MHz frequencies have been compared. Parameters such as SNR and RSSI were measured at different floors and visualized. A comparative table of packet delivery ratio at various spreading factors can be found in this paper. A series of range experiments at different spreading factors showed that 433 MHz LoRa module gains a stronger signal. However, 868 MHz LoRa module shows higher percentage of received packets. It has been concluded that for nine-story building with concrete floors it is better to deploy 868 MHz LoRa network at 10th spreading factor.