Compromise of 915 MHz LoRa Transmission Parameters in A Single-hop Uplink

Abstract

In internet of things (IoT) applications, a local connection using a single-hop uplink technique has a wide range of device options. Certain device kinds should be chosen based on the application environment. LoRa is a wireless communication device that currently offers good performance for IoT local connections. Range and data rate, on the other hand, are two transmission factors that are diametrically opposed. Therefore, this research aims to examine the LoRa transmission performance at 915 MHz to find the performance pattern based on the compromise between data rate and coverage that is adjusted spreading factor and coding rate. An experimental method of the LoRa network testbed was used to measure and evaluate its performance through the parameter setting of spreading factor, bandwidth, and coding rate. The results show that the transmission range and data rate are affected by the spreading factor and coding rate factors. To obtain the optimal LoRa transmission performance, the SF and CR parameters must be modified to strike a balance between range and data rate.