LoRa Based Underwater Wireless Network System

To apply the Internet of Things (IoT) underwater, a robust protocol is needed to connect devices. LoRa, known for its long-range and low-power characteristics, is a widely used protocol in IoT. Its significance in underwater environments lies in enabling reliable data transmission between sensors and Autonomous Underwater Vehicles (AUVs), forming an IoT network. However, implementing LoRa underwater is challenging due to high attenuation at its typical operating frequency of 433 MHz. This paper contributes by testing the performance of underwater communication systems at a frequency of 40 MHz using a planar hexagonal loop antenna, which experiences lower attenuation. Our method involves transmitting text underwater via the LoRa protocol using microcontroller and LoRa module, employing Down Conversion and Up Conversion techniques to shift the frequency from 433 MHz to 40 MHz and vice versa, using Software Defined Radio (SDR). The results demonstrate successful reception and display of the transmitted text, indicating the potential of the proposed system for effective underwater communication.