Improvement of Direct Communication to Satellite Using LoRa-FHSS Compared to LoRa-CSS (DEWASAT-1 Case of Study)

This research paper presents a comprehensive study on the utilization of Long Range (LoRa) communication for IoT (Internet of Things) applications via satellite links. The focus of the study is to evaluate the performance of LoRa communication when employing different modulation techniques, specifically Chirp Spread Spectrum (CSS) and Frequency Hopping Spread Spectrum (FHSS), in a satellite based IoT network. Real-time results obtained from satellite-based experiments are presented and interpreted to assess the effectiveness of these modulation techniques. The paper begins by providing an overview of LoRa technology and its suitability for IoT applications, emphasizing its advantages such as long-range communication, low power consumption, and robustness against interference. The research methodology involves implementing a satellite based LoRa communication system with CSS and FHSS modulation schemes. A comprehensive set of experiments is conducted, simulating real-world scenarios to evaluate the system's performance in terms of signal range, reliability, and power consumption. Multiple metrics are measured, including airtime, bit rate, and link margin, to assess the effectiveness of CSS and FHSS modulation techniques in satellite based IoT communication. The paper concludes by providing insights into the suitability of CSS and FHSS modulation techniques for satellite based IoT communication, based on the interpreted real-time results. Recommendations are given to optimize the performance of LoRa communication in satellite based IoT networks, considering factors such as system design, modulation scheme selection, and network configuration.