Improving SINR via Joint Beam and Power Management for GEO and LEO Spectrum-Sharing Satellite Communication Systems

作     者：Xiaojin Ding Zhuangzhuang Ren Huanbin Lu Gengxin Zhang Xiaojin Ding;Zhuangzhuang Ren;Huanbin Lu;Gengxin Zhang

作者机构：Telecommunication and Networks National Engineering Research CenterNanjing University of Posts and TelecommunicationsNanjing 210003China 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2022年第19卷第7期

页      面：25-36页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 

基　　金：partially supported by the National Science Foundation of China (No. 62171234, 91738201, and U21A20450) the Jiangsu Province Basic Research Project (No. BK20192002) the National Key Laboratory of Science and Technology on Space Micrwave (No. 6142411422118) 

主　　题：beam management deep Q-network GEO-LEO coexisting power allocation 

摘      要：In this paper,we investigate a geosynchronous earth orbit(GEO)and low earth orbit(LEO)coexisting satellite communication system.To decrease the interference imposed on the GEO user caused by LEO satellites,we propose a joint beammanagement and power-allocation(JBMPA)scheme to maximize signal-to-interference plus noise ratio(SINR)at the GEO user,whilst maintaining the ongoing wireless links spanning from LEO satellites to their corresponding users.Specifically,we first analyze the overlapping coverage among GEO and LEO satellites,to obtain the LEO-satellite set in which their beams impose interference on the GEO user.Then,considering the traffic of LEO satellites in the obtained set,we design a beam-management method to turn off and switch interference beams of LEO satellites.Finally,we further propose a deep Q-network(DQN)aided power allocation algorithm to allocate the transmit power for the ongoing LEO satellites in the obtained set,whose beams are unable to be managed.Numerical results show that comparing with the traditional fixed beam with power allocation(FBPA)scheme,the proposed JBMPA can achieve a higher SINR and a lower outage probability,whilst guaranteeing the ongoing wireless transmissions of LEO satellites.