This paper presents a novel transceiver design aimed at enabling Direct-to-Satellite Internet of Things (DtS-IoT) systems based on long range-frequency hopping spread spectrum (LR-FHSS). Our focus lies in developing an accurate transmission method through the analysis of the frame structure and key parameters outlined in Long Range Wide-Area Network (LoRaWAN) [1]. To address the Doppler effect in DtS-IoT networks and simultaneously receive numerous frequency hopping signals, a robust signal detector for the receiver is proposed. We verify the performance of the proposed LR-FHSS transceiver design through simulations conducted in a realistic satellite channel environment, assessing metrics such as miss detection probability and packet error probability.

翻译：本文提出了一种新颖的收发机设计方案，旨在实现基于远距离跳频扩频（LR-FHSS）的直连卫星物联网（DtS-IoT）系统。我们的重点在于通过分析《远距离广域网络（LoRaWAN）》[1]中规定的帧结构和关键参数，开发一种精确的传输方法。为解决DtS-IoT网络中的多普勒效应，并同时接收大量跳频信号，本文提出了一种适用于接收机的鲁棒信号检测器。我们通过在真实卫星信道环境下进行仿真，评估了所提出的LR-FHSS收发机设计的性能，考察指标包括漏检概率和误包概率。