Channel capacity evaluation of 920-MHz band IoT platform via LEO satellite

Abstract

In a 920-MHz band Internet-of-Things (IoT) platform via a low Earth orbit satellite, signal collisions frequently occur between the desired satellite IoT (S-IoT) terminals and interference from terrestrial IoT (T-IoT) terminals accommodated in the T-IoT platform. In this letter, computer simulation is used to evaluate the capacity for S-IoT terminals per satellite that can be achieved by applying minimum mean squared error receiver beamforming in each case of using low power wide area terminals of LoRa, Sigfox, and ELTRES. The results show that a satellite can accommodate 1 million-order terminals by using multiple channels in the 920-MHz band.