Outage Probability Analysis of LR-FHSS in Satellite IoT Networks

Long-range frequency-hopping spread spectrum (LR-FHSS) is a promising solution for long-range and dense deployment of Internet of Things (IoT) networks since it can provide a significant capacity improvement compared to the conventional Aloha-based chirp spread spectrum (CSS). In this letter, we present an analytical approach for deriving the outage probability of LR-FHSS in a satellite-based IoT network taking into account the noise, channel fading impairments, and more importantly, the capture effect. The obtained analytical expressions are validated with computer simulations and show that for a typical target outage probability of 10−2, exploiting LR-FHSS in the considered system model can serve up to 60, 000 and 120, 000 end devices per hour for 48 bytes of information using two specified data rates in the North America region. These numbers present significant capacity increases over the conventional low-power long-range (LoRa) network.