A study on LoRa Dynamic Image Transmission

Abstract

The rapid development of Internet of Things (IoT) in recent years leads to its use in different fields in daily life. Most dynamic image transmission related to the Internet of Things uses traditional transmission technologies such as WiFi or wired networks. The disadvantages of traditional transmission technology include high power consumption, high cost, or insufficient transmission distance. In order to improve the shortcomings of traditional transmission technology, we study the use of LoRa wireless transmission technology. LoRa is a low-power wide-area network (LPWAN), so the transmission distance becomes be farther than most traditional transmission technologies. In addition, the power consumption becomes lower. Even though it was originally designed to transmit low-data-volume sensor signals, we tried to make modifications to transmit high-data-volume dynamic image files. Experimental test results show that the method of WebP compression with Base 64 coding obtains the smallest image size and total packets for transmission. Under the condition of the line of sight, both RSSI and PSR are good. All the PSNRs and SSIMs are 33.84 dB and 0.904, which are acceptable for image quality. The fastest transmission time (=25.7 s) occurred in the method of WebP compression with Base 64 coding, which achieves better performance than I and P frames of H.264. Therefore, LoRa dynamic image transmission is feasible.