NOMA-based spectrum sensing for satellite-terrestrial communication

With the continuous development of wireless communication technology, the number of access devices continues to soar, which poses a grate challenge to the already scarce spectrum resources. Meanwhile, 6G will be an era of air-space-terrestrial-sea integration, and satellite spectrum resources are also very tight in the context of giant constellations. In this paper, we propose a Non-Orthogonal Multiple Access (NOMA) based spectrum sensing scheme for the future satellite-terrestrial communication scenarios, and design the transceiver from uplink and downlink scenarios, respectively. In order to better identify the user's transmission status, we obtain the feature values of each user through feature detection to make decision. We combine these two technologies to design the transceiver architecture and deduce the threshold value of feature detection in the satellite-terrestrial communication scenario. Simulations are performed in each scenario, and the results illustrate that the proposed scheme combining NOMA and spectrum sensing can greatly improve the throughput with a similar detection probability as Orthogonal Multiple Access (OMA).