Chirp Spread Spectrum Aloha in LEO Satellite Internet of Things.

Internet of Things(IoT) is developed rapidly and has permeated through many communication industries. With the increasing development of Low-Earth-Orbit(LEO) satellite industry and its advantage of border coverage, it is feasible to implement global IoT with LEO satellites. Chirp Spread Spectrum(CSS), as a kind of spread spectrum technology, has never been used in LEO satellite communication systems for IoT, while it has been already used in LoRa modulation. This paper is on the research of multi-terminal access protocol based on CSS modulation for LEO satellite IoT. And Chirp Spread Spectrum Aloha (CSSA) as a new kind of spread spectrum aloha protocol is proposed in this paper, which can improve the system throughput effectively.