An Efficient Transmission-Reception Scheme for LoRa-Based Uplink Satellite IoT Communications

Due to the impact of the superposition of noises and interferences caused by the users using the long range (LoRa) modulation with large spreading factors (SFs) for uplink satellite IoT communications, the other users using the LoRa with relatively small SFs are hard to detect without the aid of the power allocation and interference cancellation. To this end, we propose a simple but efficient transmission-reception scheme including selective repetition transmission and superposition reception. In specific, the selective repetition can support two cases of full repetition and partial repetition in order to achieve a good tradeoff between detection performance and transmission rate, and the superposition reception can mitigate the negative effect of the superposition of the noises and interferences. Simulation results validate the efficiency of the proposed scheme.