Researching on Signal Transmission Performance of LoRa Technology in Urban Environment

The wireless sensor network plays a key role in the Internet of Things (IoT), and the performance characteristic that low-power long-distance transmission has become the focus of academic and industrial research. Long Range (LoRa) technology adopts an unlicensed frequency band, and it can provide a longer communication distance for Low-Power Wide-Area Network (LPWAN) when compared with similar technologies. This paper studies the communication quality of LoRa technology in the complex urban environment with 433MHz band. In this experiment, the LoRa transceivers based on SX1278 were used. Firstly, we studied the communication quality of LoRa transceivers in complex environment. Then, we tested the power consumption of LoRa transceivers and obtained the result that there is a certain linear relationship between the power consumption of node and transmitting power. The higher the transmitting power of the transmitting node is, the higher the power it consumes, and the better the communication quality of the signal and the lower the packet loss rate. The comprehensive experimental results show that the LoRa communication link can be completely established in 433MHz band on the condition that the range between 2 LoRa transceivers in urban environment is within 1200m at least and low-cost rubber rod antennas are used.