Coordinated Resource Allocation for Satellite-Terrestrial Coexistence Based on Radio Maps

摘要

Coexistence of satellite and terres-trial wireless communication systems in the same frequency band is quite promising for addressing the challenge of spectrum scarcity. To cope with the inevitable inter-system inter-ference, radio resource allocation at both sides should be carefully re-optimized. In this paper, we focus on a scenario where a satellite com-munication system and a terrestrial distributed antenna system (DAS) coexist via spectrum sharing. We particularly utilize the radio map (RM) to reduce the system overhead for chan-nel acquisition. Based on the large-scale chan-nel state information at the transmitter (CSIT), which is derived from the RM, we propose an optimized power allocation scheme to im-prove the achievable sum rate of the terrestrial system. For the satellite side, an opportunistic user scheduling scheme is presented, to re-duce the harmful leakage interference to the terrestrial mobile users. Simulation results demonstrate that the proposed RM-based coor-dination scheme can significantly promote the performance of satellite terrestrial coexistence, although the small-scale channel fading has been ignored in the formulated optimization.