LR-FHSS Transceiver for Direct-to-Satellite IoT Communications: Design, Implementation, and Verification
<|reference_start|>LR-FHSS Transceiver for Direct-to-Satellite IoT Communications: Design, Implementation, and Verification: This paper proposes a long range-frequency hopping spread spectrum (LR-FHSS) transceiver design for the Direct-to-Satellite Internet of Things (DtS-IoT) communication system. The DtS-IoT system has recently attracted attention as a promising nonterrestrial network (NTN) solution to provide high-traffic and low-latency data transfer services to IoT devices in global coverage. In particular, this study provides guidelines for the overall DtS-IoT system architecture and design details that conform to the Long Range Wide-Area Network (LoRaWAN). Furthermore, we also detail various DtS-IoT use cases. Considering the multiple low-Earth orbit (LEO) satellites, we developed the LR-FHSS transceiver to improve system efficiency, which is the first attempt in real satellite communication systems using LR-FHSS. Moreover, as an extension of our previous work with perfect synchronization, we applied a robust synchronization scheme against the Doppler effect and co-channel interference (CCI) caused by LEO satellite channel environments, including signal detection for the simultaneous reception of numerous frequency hopping signals and an enhanced soft-output-Viterbi-algorithm (SOVA) for the header and payload receptions. Lastly, we present proof-of-concept implementation and testbeds using an application-specific integrated circuit (ASIC) chipset and a field-programmable gate array (FPGA) that verify the performance of the proposed LR-FHSS transceiver design of DtS-IoT communication systems. The laboratory test results reveal that the proposed LR-FHSS-based framework with the robust synchronization technique can provide wide coverage, seamless connectivity, and high throughput communication links for the realization of future sixth-generation (6G) networks.<|reference_end|>
@article{jung2024lr-fhss,
    title={LR-FHSS Transceiver for Direct-to-Satellite IoT Communications: Design,
  Implementation, and Verification},
    author={Sooyeob Jung, Seongah Jeong, Jinkyu Kang, Gyeongrae Im, Sangjae Lee,
  Mi-Kyung Oh, Joon Gyu Ryu, and Joonhyuk Kang},
    journal={arXiv preprint arXiv:2403.14154},
    year={2024},
    archivePrefix={arXiv},
    eprint={2403.14154},
    primaryClass={eess.SY cs.SY}
}